%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2020. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%%     http://www.apache.org/licenses/LICENSE-2.0
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%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
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%% %CopyrightEnd%
%%
-module(ets_SUITE).

-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1,
	 init_per_group/2,end_per_group/2]).
-export([default/1,setbag/1,badnew/1,verybadnew/1,named/1,keypos2/1,
	 privacy/1]).
-export([empty/1,badinsert/1]).
-export([badlookup/1,lookup_order/1]).
-export([delete_elem/1,delete_tab/1,delete_large_tab/1,
	 delete_large_named_table/1,
	 evil_delete/1,baddelete/1,match_delete/1,table_leak/1]).
-export([match_delete3/1]).
-export([firstnext/1,firstnext_concurrent/1]).
-export([slot/1]).
-export([hash_clash/1]).
-export([match1/1, match2/1, match_object/1, match_object2/1]).
-export([dups/1, misc1/1, safe_fixtable/1, info/1, tab2list/1]).
-export([info_binary_stress/1]).
-export([tab2file/1, tab2file2/1, tabfile_ext1/1,
	 tabfile_ext2/1, tabfile_ext3/1, tabfile_ext4/1, badfile/1]).
-export([heavy_lookup/1, heavy_lookup_element/1, heavy_concurrent/1]).
-export([lookup_element_mult/1]).
-export([foldl_ordered/1, foldr_ordered/1, foldl/1, foldr/1, fold_empty/1]).
-export([t_delete_object/1, t_init_table/1, t_whitebox/1,
         select_bound_chunk/1, t_delete_all_objects/1, t_test_ms/1,
	 t_select_delete/1,t_select_replace/1,t_select_replace_next_bug/1,t_ets_dets/1]).
-export([t_insert_list/1, t_insert_list_bag/1, t_insert_list_duplicate_bag/1,
         t_insert_list_set/1, t_insert_list_delete_set/1,
         t_insert_list_parallel/1, t_insert_list_delete_parallel/1,
         t_insert_list_kill_process/1]).
-export([test_table_size_concurrency/1,test_table_memory_concurrency/1,
         test_delete_table_while_size_snapshot/1, test_delete_table_while_size_snapshot_helper/1,
         test_decentralized_counters_setting/1]).

-export([ordered/1, ordered_match/1, interface_equality/1,
	 fixtable_next/1, fixtable_iter_bag/1,
         fixtable_insert/1, rename/1, rename_unnamed/1, evil_rename/1,
	 update_element/1, update_counter/1, evil_update_counter/1, partly_bound/1, match_heavy/1]).
-export([update_counter_with_default/1]).
-export([update_counter_with_default_bad_pos/1]).
-export([update_counter_table_growth/1]).
-export([member/1]).
-export([memory/1]).
-export([select_fail/1]).
-export([t_insert_new/1]).
-export([t_repair_continuation/1]).
-export([t_match_spec_run/1]).
-export([t_bucket_disappears/1]).
-export([t_named_select/1]).
-export([select_fixtab_owner_change/1]).
-export([otp_5340/1]).
-export([otp_6338/1]).
-export([otp_6842_select_1000/1]).
-export([select_mbuf_trapping/1]).
-export([otp_7665/1]).
-export([meta_wb/1]).
-export([grow_shrink/1, grow_pseudo_deleted/1, shrink_pseudo_deleted/1]).
-export([meta_lookup_unnamed_read/1, meta_lookup_unnamed_write/1,
	 meta_lookup_named_read/1, meta_lookup_named_write/1,
	 meta_newdel_unnamed/1, meta_newdel_named/1]).
-export([smp_insert/1, smp_fixed_delete/1, smp_unfix_fix/1, smp_select_delete/1,
         smp_ordered_iteration/1,
         smp_select_replace/1, otp_8166/1, otp_8732/1, delete_unfix_race/1]).
-export([throughput_benchmark/0,
         throughput_benchmark/1,
         test_throughput_benchmark/1,
         long_throughput_benchmark/1,
         lookup_catree_par_vs_seq_init_benchmark/0]).
-export([exit_large_table_owner/1,
	 exit_many_large_table_owner/1,
	 exit_many_tables_owner/1,
	 exit_many_many_tables_owner/1]).
-export([write_concurrency/1, heir/1, give_away/1, setopts/1]).
-export([bad_table/1, types/1]).
-export([otp_9932/1]).
-export([otp_9423/1]).
-export([otp_10182/1]).
-export([ets_all/1]).
-export([massive_ets_all/1]).
-export([take/1]).
-export([whereis_table/1]).
-export([ms_excessive_nesting/1]).
-export([error_info/1]).

-export([init_per_testcase/2, end_per_testcase/2]).
%% Convenience for manual testing
-export([random_test/0]).

-export([t_select_reverse/1]).

-include_lib("stdlib/include/ms_transform.hrl"). % ets:fun2ms
-include_lib("common_test/include/ct.hrl").
-include_lib("common_test/include/ct_event.hrl").

-define(m(A,B), assert_eq(A,B)).
-define(heap_binary_size, 64).

init_per_testcase(Case, Config) ->
    rand:seed(default),
    io:format("*** SEED: ~p ***\n", [rand:export_seed()]),
    start_spawn_logger(),
    wait_for_test_procs(), %% Ensure previous case cleaned up
    [{test_case, Case} | Config].

end_per_testcase(_Func, _Config) ->
    wait_for_test_procs(true).


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

suite() ->
    [{ct_hooks,[ts_install_cth]},
     {timetrap,{minutes,5}}].

all() ->
    [{group, new}, {group, insert}, {group, lookup},
     {group, delete}, firstnext, firstnext_concurrent, slot, hash_clash,
     {group, match}, t_match_spec_run,
     {group, lookup_element}, {group, misc}, {group, files},
     {group, heavy}, {group, insert_list}, ordered, ordered_match,
     interface_equality, fixtable_next, fixtable_iter_bag, fixtable_insert,
     rename, rename_unnamed, evil_rename, update_element,
     update_counter, evil_update_counter,
     update_counter_with_default,
     update_counter_with_default_bad_pos,
     partly_bound,
     update_counter_table_growth,
     match_heavy, {group, fold}, member, t_delete_object,
     select_bound_chunk,
     t_init_table, t_whitebox, t_delete_all_objects,
     t_test_ms, t_select_delete, t_select_replace,
     t_select_replace_next_bug,
     t_ets_dets, memory, t_select_reverse, t_bucket_disappears,
     t_named_select, select_fixtab_owner_change,
     select_fail, t_insert_new, t_repair_continuation,
     otp_5340, otp_6338, otp_6842_select_1000, otp_7665,
     select_mbuf_trapping,
     otp_8732, meta_wb, grow_shrink, grow_pseudo_deleted,
     shrink_pseudo_deleted, {group, meta_smp}, smp_insert,
     smp_fixed_delete, smp_unfix_fix, smp_select_replace,
     smp_ordered_iteration,
     smp_select_delete, otp_8166, exit_large_table_owner,
     exit_many_large_table_owner, exit_many_tables_owner,
     exit_many_many_tables_owner, write_concurrency, heir,
     give_away, setopts, bad_table, types,
     otp_10182,
     otp_9932,
     otp_9423,
     ets_all,
     massive_ets_all,
     take,
     whereis_table,
     delete_unfix_race,
     %test_throughput_benchmark,
     %{group, benchmark},
     test_table_size_concurrency,
     test_table_memory_concurrency,
     test_delete_table_while_size_snapshot,
     test_decentralized_counters_setting,
     ms_excessive_nesting,
     error_info].


groups() ->
    [{new, [],
      [default, setbag, badnew, verybadnew, named, keypos2,
       privacy]},
     {insert, [], [empty, badinsert]},
     {lookup, [], [badlookup, lookup_order]},
     {lookup_element, [], [lookup_element_mult]},
     {delete, [],
      [delete_elem, delete_tab, delete_large_tab,
       delete_large_named_table, evil_delete, table_leak,
       baddelete, match_delete, match_delete3]},
     {match, [],
      [match1, match2, match_object, match_object2]},
     {misc, [],
      [misc1, safe_fixtable, info, info_binary_stress, dups, tab2list]},
     {files, [],
      [tab2file, tab2file2, tabfile_ext1,
       tabfile_ext2, tabfile_ext3, tabfile_ext4, badfile]},
     {heavy, [],
      [heavy_lookup, heavy_lookup_element, heavy_concurrent]},
     {fold, [],
      [foldl_ordered, foldr_ordered, foldl, foldr,
       fold_empty]},
     {meta_smp, [],
      [meta_lookup_unnamed_read, meta_lookup_unnamed_write,
       meta_lookup_named_read, meta_lookup_named_write,
       meta_newdel_unnamed, meta_newdel_named]},
     {benchmark, [],
      [long_throughput_benchmark]},
     {insert_list, [],
      [t_insert_list, t_insert_list_set, t_insert_list_bag,
       t_insert_list_duplicate_bag, t_insert_list_delete_set,
       t_insert_list_parallel, t_insert_list_delete_parallel,
       t_insert_list_kill_process]}].

init_per_suite(Config) ->
    erts_debug:set_internal_state(available_internal_state, true),
    case erts_debug:set_internal_state(ets_force_trap, true) of
        ok ->
            [{ets_force_trap, true} | Config];
        notsup ->
            Config
    end.

end_per_suite(_Config) ->
    stop_spawn_logger(),
    erts_debug:set_internal_state(ets_force_trap, false),
    catch erts_debug:set_internal_state(available_internal_state, false),
    ok.

init_per_group(benchmark, Config) ->
    P = self(),
    %% Spawn owner of ETS table that is alive until end_per_group is run
    EtsProcess =
        spawn(
          fun()->
                  Tab = ets:new(ets_benchmark_result_summary_tab, [public]),
                  P ! {the_table, Tab},
                  receive
                      kill -> ok
                  end
          end),
    Tab = receive {the_table, T} -> T end,
    CounterNames = [nr_of_benchmarks,
                    total_throughput,
                    nr_of_set_benchmarks,
                    total_throughput_set,
                    nr_of_ordered_set_benchmarks,
                    total_throughput_ordered_set],
    lists:foreach(fun(CtrName) ->
                          ets:insert(Tab, {CtrName, 0.0})
                  end,
                  CounterNames),
    [{ets_benchmark_result_summary_tab, Tab},
     {ets_benchmark_result_summary_tab_process, EtsProcess} | Config];
init_per_group(_GroupName, Config) ->
    Config.

end_per_group(benchmark, Config) ->
    T = proplists:get_value(ets_benchmark_result_summary_tab, Config),
    EtsProcess = proplists:get_value(ets_benchmark_result_summary_tab_process, Config),
    Report = 
        fun(NOfBenchmarksCtr, TotThroughoutCtr, Name) ->
                Average =
                    ets:lookup_element(T, TotThroughoutCtr, 2) / 
                    ets:lookup_element(T, NOfBenchmarksCtr, 2),
                io:format("~p ~p~n", [Name, Average]),
                ct_event:notify(
                  #event{name = benchmark_data, 
                         data = [{suite,"ets_bench"},
                                 {name, Name},
                                 {value, Average}]})
        end,
    Report(nr_of_benchmarks,
           total_throughput,
           "Average Throughput"),
    Report(nr_of_set_benchmarks,
           total_throughput_set,
           "Average Throughput Set"),
    Report(nr_of_ordered_set_benchmarks,
           total_throughput_ordered_set,
           "Average Throughput Ordered Set"),
    ets:delete(T),
    EtsProcess ! kill,
    Config;
end_per_group(_GroupName, Config) ->
    Config.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%% Test that a disappearing bucket during select of a non-fixed table works.
t_bucket_disappears(Config) when is_list(Config) ->
    repeat_for_opts(fun t_bucket_disappears_do/1).

t_bucket_disappears_do(Opts) ->
    EtsMem = etsmem(),
    ets_new(abcd, [named_table, public, {keypos, 2} | Opts]),
    ets:insert(abcd, {abcd,1,2}),
    ets:insert(abcd, {abcd,2,2}),
    ets:insert(abcd, {abcd,3,2}),
    {_, Cont} = ets:select(abcd, [{{'_', '$1', '_'},
				   [{'<', '$1', {const, 10}}],
				   ['$1']}], 1),
    ets:delete(abcd, 2),
    ets:select(Cont),
    true = ets:delete(abcd),
    verify_etsmem(EtsMem).

%% OTP-21: Test that select/1 fails if named table was deleted and recreated
%%         and succeeds if table was renamed.
t_named_select(_Config) ->
    repeat_for_opts(fun t_named_select_do/1).

t_named_select_do(Opts) ->
    EtsMem = etsmem(),
    T = t_name_tid_select,
    ets_new(T, [named_table | Opts]),
    ets:insert(T, {1,11}),
    ets:insert(T, {2,22}),
    ets:insert(T, {3,33}),
    MS = [{{'$1', 22}, [], ['$1']}],
    {[2], Cont1} = ets:select(T, MS, 1),
    ets:delete(T),
    {'EXIT',{badarg,_}} = (catch ets:select(Cont1)),
    ets_new(T, [named_table | Opts]),
    {'EXIT',{badarg,_}} = (catch ets:select(Cont1)),

    true = ets:insert_new(T, {1,22}),
    true = ets:insert_new(T, {2,22}),
    true = ets:insert_new(T, {4,22}),
    {[A,B], Cont2} = ets:select(T, MS, 2),
    ets:rename(T, abcd),
    {[C], '$end_of_table'} = ets:select(Cont2),
    7 = A + B + C,

    true = ets:delete(abcd),
    verify_etsmem(EtsMem).


%% Verify select and friends release fixtab as they should
%% even when owneship is changed between traps.
select_fixtab_owner_change(_Config) ->
    T = ets:new(xxx, [protected]),
    NKeys = 2000,
    [ets:insert(T,{K,K band 7}) || K <- lists:seq(1,NKeys)],

    %% Buddy and Papa will ping-pong table ownership between them
    %% and the aim is to give Buddy the table when he is
    %% in the middle of a yielding select* call.
    {Buddy,_} = spawn_opt(fun() -> sfoc_buddy_loop(T, 1, undefined) end,
                          [link,monitor]),

    sfoc_papa_loop(T, Buddy),

    receive {'DOWN', _, process, Buddy, _} -> ok end,
    ets:delete(T),
    ok.

sfoc_buddy_loop(T, I, State0) ->
    receive
        {'ETS-TRANSFER', T, Papa, _} ->
            ets:give_away(T, Papa, State0),
            case State0 of
                done ->
                    ok;
                _ ->
                    State1 = sfoc_traverse(T, I, State0),
                    %% Verify no fixation left
                    {I, false} = {I, ets:info(T, safe_fixed_monotonic_time)},
                    sfoc_buddy_loop(T, I+1, State1)
            end
    end.

sfoc_papa_loop(T, Buddy) ->
    ets:give_away(T, Buddy, "Catch!"),
    receive
        {'ETS-TRANSFER', T, Buddy, State} ->
            case State of
                done ->
                    ok;
                _ ->
                    sfoc_papa_loop(T, Buddy)
            end
    end.

sfoc_traverse(T, 1, S) ->
    ets:select(T, [{{'$1',7}, [], ['$1']}]), S;
sfoc_traverse(T, 2, S) ->
    0 = ets:select_count(T, [{{'$1',7}, [], [false]}]), S;
sfoc_traverse(T, 3, _) ->
    Limit = ets:info(T, size) div 2,
    {_, Continuation} = ets:select(T, [{{'$1',7}, [], ['$1']}],
                                   Limit),
    Continuation;
sfoc_traverse(_T, 4, Continuation) ->
    _ = ets:select(Continuation),
    done.

%% Check ets:match_spec_run/2.
t_match_spec_run(Config) when is_list(Config) ->
    ct:timetrap({minutes,30}), %% valgrind needs a lot
    init_externals(),
    EtsMem = etsmem(),

    t_match_spec_run_test([{1},{2},{3}],
			  [{{'$1'},[{'>','$1',1}],['$1']}],
			  [2,3]),

    Huge = [{X} || X <- lists:seq(1,2500)],
    L = lists:seq(2476,2500),
    t_match_spec_run_test(Huge, [{{'$1'},[{'>','$1',2475}],['$1']}], L),

    L2 = [{X*16#FFFFFFF} || X <- L],
    t_match_spec_run_test(Huge,
			  [{{'$1'}, [{'>','$1',2475}], [{{{'*','$1',16#FFFFFFF}}}]}],
			  L2),

    t_match_spec_run_test(Huge, [{{'$1'}, [{'=:=',{'rem','$1',500},0}], ['$1']}],
			  [500,1000,1500,2000,2500]),

    %% More matching fun with several match clauses and guards,
    %% applied to a variety of terms.
    Fun = fun(Term) ->
		  CTerm = {const, Term},

		  N_List = [{Term, "0", "v-element"},
			    {"=hidden_node", "0", Term},
			    {"0", Term, Term},
			    {"something", Term, "something else"},
			    {"guard and res", Term, 872346},
			    {Term, {'and',Term,'again'}, 3.14},
			    {Term, {'and',Term,'again'}, "m&g"},
			    {Term, {'and',Term,'again'}, "m&g&r"},
			    {[{second,Term}, 'and', "tail"], Term, ['and',"tail"]}],

		  N_MS = [{{'$1','$2','$3'},
			   [{'=:=','$1',CTerm}, {'=:=','$2',{const,"0"}}],
			   [{{"Guard only for $1",'$3'}}]},

			  {{'$3','$1','$4'},
			   [{'=:=','$3',"=hidden_node"}, {'=:=','$1',{const,"0"}}],
			   [{{"Result only for $4",'$4'}}]},

			  {{'$2','$1','$1'},
			   [{'=:=','$2',{const,"0"}}],
			   [{{"Match only for $1",'$2'}}]},

			  {{'$2',Term,['$3'|'_']},
			   [{is_list,'$2'},{'=:=','$3',$s}],
			   [{{"Matching term",'$2'}}]},

			  {{'$1','$2',872346},
			   [{'=:=','$2',CTerm}, {is_list,'$1'}],
			   [{{"Guard and result",'$2'}}]},

			  {{'$1', {'and','$1','again'}, '$2'},
			   [{is_float,'$2'}],
			   [{{"Match and result",'$1'}}]},

			  {{'$1', {'and','$1','again'}, '$2'},
			   [{'=:=','$1',CTerm}, {'=:=', '$2', "m&g"}],
			   [{{"Match and guard",'$2'}}]},

			  {{'$1', {'and','$1','again'}, "m&g&r"},
			   [{'=:=','$1',CTerm}],
			   [{{"Match, guard and result",'$1'}}]},

			  {{'$1', '$2', '$3'},
			   [{'=:=','$1',[{{second,'$2'}} | '$3']}],
			   [{{"Building guard"}}]}
			 ],

		  N_Result = [{"Guard only for $1", "v-element"},
			      {"Result only for $4", Term},
			      {"Match only for $1", "0"},
			      {"Matching term","something"},
			      {"Guard and result",Term},
			      {"Match and result",Term},
			      {"Match and guard","m&g"},
			      {"Match, guard and result",Term},
			      {"Building guard"}],

		  F = fun(N_MS_Perm) ->
			      t_match_spec_run_test(N_List, N_MS_Perm, N_Result)
		      end,
		  repeat_for_permutations(F, N_MS)
	  end,
    test_terms(Fun, skip_refc_check),

    verify_etsmem(EtsMem).

t_match_spec_run_test(List, MS, Result) ->

    %%io:format("ms = ~p\n",[MS]),

    ?m(Result, ets:match_spec_run(List, ets:match_spec_compile(MS))),

    %% Check that ets:select agree
    Tab = ets:new(xxx, [bag]),
    ets:insert(Tab, List),
    SRes = lists:sort(Result),
    ?m(SRes, lists:sort(ets:select(Tab, MS))),
    ets:delete(Tab),

    %% Check that tracing agree
    Self = self(),
    {Tracee, MonRef} = my_spawn_monitor(fun() -> ms_tracee(Self, List) end),
    receive {Tracee, ready} -> ok end,

    MST = lists:map(fun(Clause) -> ms_clause_ets_to_trace(Clause) end, MS),

    %%io:format("MS = ~p\nMST= ~p\n",[MS,MST]),

    erlang:trace_pattern({?MODULE,ms_tracee_dummy,'_'}, MST , [local]),
    erlang:trace(Tracee, true, [call]),
    Tracee ! start,
    TRes = ms_tracer_collect(Tracee, MonRef, []),
    case TRes of
	SRes -> ok;
	_ ->
	    io:format("TRACE MATCH FAILED\n"),
	    io:format("Input = ~p\nMST = ~p\nExpected = ~p\nGot = ~p\n", [List, MST, SRes, TRes]),
	    ct:fail("TRACE MATCH FAILED")
    end,
    ok.



ms_tracer_collect(Tracee, Ref, Acc) ->
    receive
	{trace, Tracee, call, _Args, [Msg]} ->
	    ms_tracer_collect(Tracee, Ref, [Msg | Acc]);

	{'DOWN', Ref, process, Tracee, _} ->
	    TDRef = erlang:trace_delivered(Tracee),
	    ms_tracer_collect(Tracee, TDRef, Acc);

	{trace_delivered, Tracee, Ref} ->
	    lists:sort(Acc);

	Other ->
	    io:format("Unexpected message = ~p\n", [Other]),
	    ct:fail("Unexpected tracer msg")
    end.


ms_tracee(Parent, CallArgList) ->
    Parent ! {self(), ready},
    receive start -> ok end,
    F = fun({A1}) ->
                ms_tracee_dummy(A1);
           ({A1,A2}) ->
                   ms_tracee_dummy(A1, A2);
           ({A1,A2,A3}) ->
                ms_tracee_dummy(A1, A2, A3);
           ({A1,A2,A3,A4}) ->
                ms_tracee_dummy(A1, A2, A3, A4)
        end,
    lists:foreach(F, CallArgList).

ms_tracee_dummy(_) -> ok.
ms_tracee_dummy(_,_) -> ok.
ms_tracee_dummy(_,_,_) -> ok.
ms_tracee_dummy(_,_,_,_) -> ok.

ms_clause_ets_to_trace({Head, Guard, Body}) ->
    {tuple_to_list(Head), Guard, [{message, Body}]}.

assert_eq(A,A) -> ok;
assert_eq(A,B) ->
    io:format("FAILED MATCH:\n~p\n =/=\n~p\n",[A,B]),
    ct:fail("assert_eq failed").


%% Test ets:repair_continuation/2.
t_repair_continuation(Config) when is_list(Config) ->
    repeat_for_opts(fun t_repair_continuation_do/1).


t_repair_continuation_do(Opts) ->
    EtsMem = etsmem(),
    MS = [{'_',[],[true]}],
    MS2 = [{{{'$1','_'},'_'},[],['$1']}],
    (fun() ->
	     T = ets_new(x,[ordered_set|Opts]),
	     F = fun(0,_)->ok;(N,F) -> ets:insert(T,{N,N}), F(N-1,F) end,
	     F(1000,F),
	     {_,C} = ets:select(T,MS,5),
	     C2 = erlang:setelement(5,C,<<>>),
	     {'EXIT',{badarg,_}} = (catch ets:select(C2)),
	     C3 = ets:repair_continuation(C2,MS),
	     {[true,true,true,true,true],_} = ets:select(C3),
	     {[true,true,true,true,true],_} = ets:select(C),
	     true = ets:delete(T)
     end)(),
    (fun() ->
	     T = ets_new(x,[ordered_set|Opts]),
	     F = fun(0,_)->ok;(N,F) -> ets:insert(T,{N,N}), F(N-1,F) end,
	     F(1000,F),
	     {_,C} = ets:select(T,MS,1001),
	     C = '$end_of_table',
	     C3 = ets:repair_continuation(C,MS),
	     '$end_of_table' = ets:select(C3),
	     '$end_of_table' = ets:select(C),
	     true = ets:delete(T)
     end)(),

    (fun() ->
	     T = ets_new(x,[ordered_set|Opts]),
	     F = fun(0,_)->ok;(N,F) ->
			 ets:insert(T,{integer_to_list(N),N}),
			 F(N-1,F)
		 end,
	     F(1000,F),
	     {_,C} = ets:select(T,MS,5),
	     C2 = erlang:setelement(5,C,<<>>),
	     {'EXIT',{badarg,_}} = (catch ets:select(C2)),
	     C3 = ets:repair_continuation(C2,MS),
	     {[true,true,true,true,true],_} = ets:select(C3),
	     {[true,true,true,true,true],_} = ets:select(C),
	     true = ets:delete(T)
     end)(),
    (fun() ->
	     T = ets_new(x,[ordered_set|Opts]),
	     F = fun(0,_)->ok;(N,F) ->
			 ets:insert(T,{{integer_to_list(N),N},N}),
			 F(N-1,F)
		 end,
	     F(1000,F),
	     {_,C} = ets:select(T,MS2,5),
	     C2 = erlang:setelement(5,C,<<>>),
	     {'EXIT',{badarg,_}} = (catch ets:select(C2)),
	     C3 = ets:repair_continuation(C2,MS2),
	     {[_,_,_,_,_],_} = ets:select(C3),
	     {[_,_,_,_,_],_} = ets:select(C),
	     true = ets:delete(T)
     end)(),

    (fun() ->
	     T = ets_new(x,[set|Opts]),
	     F = fun(0,_)->ok;(N,F) ->
			 ets:insert(T,{N,N}),
			 F(N-1,F)
		 end,
	     F(1000,F),
	     {_,C} = ets:select(T,MS,5),
	     C2 = erlang:setelement(4,C,<<>>),
	     {'EXIT',{badarg,_}} = (catch ets:select(C2)),
	     C3 = ets:repair_continuation(C2,MS),
	     {[true,true,true,true,true],_} = ets:select(C3),
	     {[true,true,true,true,true],_} = ets:select(C),
	     true = ets:delete(T)
     end)(),
    (fun() ->
	     T = ets_new(x,[set|Opts]),
	     F = fun(0,_)->ok;(N,F) ->
			 ets:insert(T,{integer_to_list(N),N}),
			 F(N-1,F)
		 end,
	     F(1000,F),
	     {_,C} = ets:select(T,MS,5),
	     C2 = erlang:setelement(4,C,<<>>),
	     {'EXIT',{badarg,_}} = (catch ets:select(C2)),
	     C3 = ets:repair_continuation(C2,MS),
	     {[true,true,true,true,true],_} = ets:select(C3),
	     {[true,true,true,true,true],_} = ets:select(C),
	     true = ets:delete(T)
     end)(),
    (fun() ->
	     T = ets_new(x,[bag|Opts]),
	     F = fun(0,_)->ok;(N,F) ->
			 ets:insert(T,{integer_to_list(N),N}),
			 F(N-1,F)
		 end,
	     F(1000,F),
	     {_,C} = ets:select(T,MS,5),
	     C2 = erlang:setelement(4,C,<<>>),
	     {'EXIT',{badarg,_}} = (catch ets:select(C2)),
	     C3 = ets:repair_continuation(C2,MS),
	     {[true,true,true,true,true],_} = ets:select(C3),
	     {[true,true,true,true,true],_} = ets:select(C),
	     true = ets:delete(T)
     end)(),
    (fun() ->
	     T = ets_new(x,[duplicate_bag|Opts]),
	     F = fun(0,_)->ok;(N,F) ->
			 ets:insert(T,{integer_to_list(N),N}),
			 F(N-1,F)
		 end,
	     F(1000,F),
	     {_,C} = ets:select(T,MS,5),
	     C2 = erlang:setelement(4,C,<<>>),
	     {'EXIT',{badarg,_}} = (catch ets:select(C2)),
	     C3 = ets:repair_continuation(C2,MS),
	     {[true,true,true,true,true],_} = ets:select(C3),
	     {[true,true,true,true,true],_} = ets:select(C),
	     true = ets:delete(T)
     end)(),
    false = ets:is_compiled_ms(<<>>),
    true = ets:is_compiled_ms(ets:match_spec_compile(MS)),
    verify_etsmem(EtsMem).


%% Test correct default vaules of a new ets table.
default(Config) when is_list(Config) ->
    %% Default should be set,protected
    EtsMem = etsmem(),
    Def = ets_new(def,[]),
    set = ets:info(Def,type),
    protected = ets:info(Def,protection),
    Compressed = erlang:system_info(ets_always_compress),
    Compressed = ets:info(Def,compressed),
    Self = self(),
    Self = ets:info(Def,owner),
    none = ets:info(Def, heir),
    false = ets:info(Def,named_table),
    ets:delete(Def),
    verify_etsmem(EtsMem).

%% Test that select fails even if nothing can match.
select_fail(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts(fun select_fail_do/1,
                    [all_types,write_concurrency]),
    verify_etsmem(EtsMem).

select_fail_do(Opts) ->
    T = ets_new(x,Opts),
    ets:insert(T,{a,a}),
    case (catch
	      ets:select(T,[{{a,'_'},[],[{snuffla}]}])) of
	{'EXIT',{badarg,_}} ->
	    ok;
	Else0 ->
	    exit({type,ets:info(T,type),
		  expected,'EXIT',got,Else0})
    end,
    case (catch
	      ets:select(T,[{{b,'_'},[],[{snuffla}]}])) of
	{'EXIT',{badarg,_}} ->
	    ok;
	Else1 ->
	    exit({type,ets:info(T,type),
		  expected,'EXIT',got,Else1})
    end,
    ets:delete(T).


-define(S(T),ets:info(T,memory)).

%% Whitebox test of ets:info(X, memory).
memory(Config) when is_list(Config) ->
    ok = chk_normal_tab_struct_size(),
    repeat_for_opts(fun memory_do/1, [compressed]),
    catch erts_debug:set_internal_state(available_internal_state, false).

memory_do(Opts) ->
    L = [T1,T2,T3,T4] = fill_sets_int(1000,Opts),
    XR1 = case mem_mode(T1) of
	      {normal,_} ->     {13836, 15346, 15346, 15346+6};
	      {compressed,4} -> {11041, 12551, 12551, 12551+1};
	      {compressed,8} -> {10050, 11560, 11560, 11560}
	  end,
    XRes1 = adjust_xmem(L, XR1, 1),
    Res1 = {?S(T1),?S(T2),?S(T3),?S(T4)},
    lists:foreach(fun(T) ->
			  Before = ets:info(T,size),
			  Key = 2, %894, %%ets:first(T),
			  Objs = ets:lookup(T,Key),
			  ets:delete(T,Key),
			  io:format("deleted key ~p from ~p changed size ~p to ~p: ~p\n",
				    [Key, ets:info(T,type), Before, ets:info(T,size), Objs])
		  end,
		  L),
    XR2 = case mem_mode(T1) of
	      {normal,_} ->     {13826, 15337, 15337-9, 15337-3};
	      {compressed,4} -> {11031, 12542, 12542-9, 12542-8};
	      {compressed,8} -> {10040, 11551, 11551-9, 11551-9}
	  end,
    XRes2 = adjust_xmem(L, XR2, 1),
    Res2 = {?S(T1),?S(T2),?S(T3),?S(T4)},
    lists:foreach(fun(T) ->
			  Before = ets:info(T,size),
			  Key = 4, %802, %ets:first(T),
			  Objs = ets:lookup(T,Key),
			  ets:match_delete(T,{Key,'_'}),
			  io:format("match_deleted key ~p from ~p changed size ~p to ~p: ~p\n",
				    [Key, ets:info(T,type), Before, ets:info(T,size), Objs])
		  end,
		  L),
    XR3 = case mem_mode(T1) of
	      {normal,_} ->     {13816, 15328, 15328-18, 15328-12};
	      {compressed,4} -> {11021, 12533, 12533-18, 12533-17};
	      {compressed,8} -> {10030, 11542, 11542-18, 11542-18}
	  end,
    XRes3 = adjust_xmem(L, XR3, 1),
    Res3 = {?S(T1),?S(T2),?S(T3),?S(T4)},
    lists:foreach(fun(T) ->
			  ets:delete_all_objects(T)
		  end,
		  L),
    XRes4 = adjust_xmem(L, {50, 256, 256, 256}, 0),
    Res4 = {?S(T1),?S(T2),?S(T3),?S(T4)},
    lists:foreach(fun(T) ->
			  ets:delete(T)
		  end,
		  L),
    L2 =  [T11,T12,T13,T14] = fill_sets_int(1000),
    lists:foreach(fun(T) ->
			  ets:select_delete(T,[{'_',[],[true]}])
		  end,
		  L2),
    XRes5 = adjust_xmem(L2, {50, 256, 256, 256}, 0),
    Res5 = {?S(T11),?S(T12),?S(T13),?S(T14)},
    io:format("XRes1 = ~p~n"
	      " Res1 = ~p~n~n"
	      "XRes2 = ~p~n"
	      " Res2 = ~p~n~n"
	      "XRes3 = ~p~n"
	      " Res3 = ~p~n~n"
	      "XRes4 = ~p~n"
	      " Res4 = ~p~n~n"
	      "XRes5 = ~p~n"
	      " Res5 = ~p~n~n",
	      [XRes1, Res1,
	       XRes2, Res2,
	       XRes3, Res3,
	       XRes4, Res4,
	       XRes5, Res5]),
    XRes1 = Res1,
    XRes2 = Res2,
    XRes3 = Res3,
    XRes4 = Res4,
    XRes5 = Res5,
    ok.

mem_mode(T) ->
    {case ets:info(T,compressed) of
	 true -> compressed;
	 false -> normal
     end,
     erlang:system_info(wordsize)}.

chk_normal_tab_struct_size() ->
    System = {os:type(),
	      os:version(),
	      erlang:system_info(wordsize),
	      erlang:system_info(smp_support),
	      erlang:system_info(heap_type)},
    io:format("System = ~p~n", [System]),
    ok.

adjust_xmem([_T1,_T2,_T3,_T4], {A0,B0,C0,D0} = _Mem0, EstCnt) ->
    %% Adjust for 64-bit, smp, and os:
    %%   Table struct size may differ.

    {TabSz, EstSz} = erts_debug:get_internal_state('DbTable_words'),
    HTabSz = TabSz + EstCnt*EstSz,
    OrdSetExtra = case erlang:system_info(wordsize) of
                      8 -> 40; % larger stack on 64 bit architectures
                      _ -> 0
                  end,
    {A0+TabSz+OrdSetExtra, B0+HTabSz, C0+HTabSz, D0+HTabSz}.

%% Misc. whitebox tests
t_whitebox(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts(fun whitebox_1/1),
    repeat_for_opts(fun whitebox_1/1),
    repeat_for_opts(fun whitebox_1/1),
    repeat_for_opts(fun whitebox_2/1),
    repeat_for_opts(fun whitebox_2/1),
    repeat_for_opts(fun whitebox_2/1),
    verify_etsmem(EtsMem).

whitebox_1(Opts) ->
    T=ets_new(x,[bag | Opts]),
    ets:insert(T,[{du,glade},{ta,en}]),
    ets:insert(T,[{hej,hopp2},{du,glade2},{ta,en2}]),
    {_,C}=ets:match(T,{ta,'$1'},1),
    ets:select(C),
    ets:match(C),
    ets:delete(T),
    ok.

whitebox_2(Opts) ->
    T=ets_new(x,[ordered_set, {keypos,2} | Opts]),
    T2=ets_new(x,[set, {keypos,2}| Opts]),
    0 = ets:select_delete(T,[{{hej},[],[true]}]),
    0 = ets:select_delete(T,[{{hej,hopp},[],[true]}]),
    0 = ets:select_delete(T2,[{{hej},[],[true]}]),
    0 = ets:select_delete(T2,[{{hej,hopp},[],[true]}]),
    ets:delete(T),
    ets:delete(T2),
    ok.

select_bound_chunk(_Config) ->
    repeat_for_opts(fun select_bound_chunk_do/1, [all_types]).

select_bound_chunk_do(Opts) ->
    T = ets_new(x, Opts),
    ets:insert(T, [{key, 1}]),
    {[{key, 1}], '$end_of_table'} = ets:select(T, [{{key,1},[],['$_']}], 100000),
    ok.


%% Test ets:to/from_dets.
t_ets_dets(Config) when is_list(Config) ->
    repeat_for_opts(fun(Opts) -> t_ets_dets(Config,Opts) end).

t_ets_dets(Config, Opts) ->
    Fname = gen_dets_filename(Config,1),
    (catch file:delete(Fname)),
    {ok,DTab} = dets:open_file(testdets_1,
			       [{file, Fname}]),
    ETab = ets_new(x,Opts),
    filltabint(ETab,3000),
    DTab = ets:to_dets(ETab,DTab),
    ets:delete_all_objects(ETab),
    0 = ets:info(ETab,size),
    true = ets:from_dets(ETab,DTab),
    3000 = ets:info(ETab,size),
    ets:delete(ETab),
    check_badarg(catch ets:to_dets(ETab,DTab),
		 ets, to_dets, [ETab,DTab]),
    check_badarg(catch ets:from_dets(ETab,DTab),
		 ets, from_dets, [ETab,DTab]),
    ETab2 = ets_new(x,Opts),
    filltabint(ETab2,3000),
    dets:close(DTab),
    check_badarg(catch ets:to_dets(ETab2,DTab),
		 ets, to_dets, [ETab2,DTab]),
    check_badarg(catch ets:from_dets(ETab2,DTab),
		 ets, from_dets, [ETab2,DTab]),
    ets:delete(ETab2),
    (catch file:delete(Fname)),
    ok.

check_badarg({'EXIT', {badarg, [{M,F,Args,_} | _]}}, M, F, Args) ->
    true.

%% Test ets:delete_all_objects/1.
t_delete_all_objects(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts_all_set_table_types(fun t_delete_all_objects_do/1),
    verify_etsmem(EtsMem).

get_kept_objects(T) ->
    case ets:info(T,stats) of
	{_,_,_,_,_,_,KO}  ->
	    KO;
        _ ->
            0
    end.

t_delete_all_objects_do(Opts) ->
    KeyRange = 4000,
    T=ets_new(x, Opts, KeyRange),
    filltabint(T,KeyRange),
    O=ets:first(T),
    ets:next(T,O),
    ets:safe_fixtable(T,true),
    true = ets:delete_all_objects(T),
    '$end_of_table' = ets:next(T,O),
    0 = ets:info(T,size),
    case ets:info(T,type) of
        ordered_set -> ok;
        _ -> KeyRange = get_kept_objects(T)
    end,
    ets:safe_fixtable(T,false),
    0 = ets:info(T,size),
    0 = get_kept_objects(T),
    filltabint(T, KeyRange),
    KeyRange = ets:info(T,size),
    true = ets:delete_all_objects(T),
    0 = ets:info(T,size),
    ets:delete(T),

    %% Test delete_all_objects is atomic
    T2 = ets_new(t_delete_all_objects, [public | Opts]),
    Self = self(),
    Inserters = [spawn_link(fun() -> inserter(T2, 1, Self) end) || _ <- [1,2,3,4]],
    [receive {Ipid, running} -> ok end || Ipid <- Inserters],
    
    ets:delete_all_objects(T2),
    erlang:yield(),
    [Ipid ! stop || Ipid <- Inserters],
    Result = [receive {Ipid, stopped, Highest} -> {Ipid,Highest} end || Ipid <- Inserters],
    
    %% Verify unbroken sequences of objects inserted _after_ ets:delete_all_objects.
    Sum = lists:foldl(fun({Ipid, Highest}, AccSum) ->
                              %% ets:fun2ms(fun({{K,Ipid}}) when K =< Highest -> true end),
                              AliveMS = [{{{'$1',Ipid}},[{'=<','$1',{const,Highest}}],[true]}],
                              Alive = ets:select_count(T2, AliveMS),
                              Lowest = Highest - (Alive-1),

                              %% ets:fun2ms(fun({{K,Ipid}}) when K < Lowest -> true end)
                              DeletedMS = [{{{'$1',Ipid}},[{'<','$1',{const,Lowest}}],[true]}],
                              0 = ets:select_count(T2, DeletedMS),
                              AccSum + Alive
                      end,
                      0,
                      Result),
    ok = case ets:info(T2, size) of
             Sum -> ok;
             Size ->
                 io:format("Sum = ~p\nSize = ~p\n", [Sum, Size]),
                 {Sum,Size}
         end,

    ets:delete(T2).

inserter(T, Next, Papa) ->
    Wait = case Next of
               10*1000 ->
                   Papa ! {self(), running},
                   0;
               100*1000 -> %% We most often don't reach this far
                   io:format("Inserter ~p reached ~p objects\n",
                             [self(), Next]),
                   infinity;
               _ ->
                   0
           end,
                
    ets:insert(T, {{Next, self()}}),
    receive
        stop ->
            Papa ! {self(), stopped, Next},
            ok
    after Wait ->
            inserter(T, Next+1, Papa)
    end.


%% Test ets:delete_object/2.
t_delete_object(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts(fun t_delete_object_do/1),
    verify_etsmem(EtsMem).

t_delete_object_do(Opts) ->
    T = ets_new(x,Opts),
    filltabint(T,4000),
    del_one_by_one_set(T,1,4001),
    filltabint(T,4000),
    del_one_by_one_set(T,4000,0),
    filltabint(T,4000),
    First = ets:first(T),
    Next = ets:next(T,First),
    ets:safe_fixtable(T,true),
    ets:delete_object(T,{First, integer_to_list(First)}),
    Next = ets:next(T,First),
    3999 = ets:info(T,size),
    1 = get_kept_objects(T),
    ets:safe_fixtable(T,false),
    3999 = ets:info(T,size),
    0 = get_kept_objects(T),
    ets:delete(T),
    T1 = ets_new(x,[ordered_set | Opts]),
    filltabint(T1,4000),
    del_one_by_one_set(T1,1,4001),
    filltabint(T1,4000),
    del_one_by_one_set(T1,4000,0),
    ets:delete(T1),
    T2 = ets_new(x,[bag | Opts]),
    filltabint2(T2,4000),
    del_one_by_one_bag(T2,1,4001),
    filltabint2(T2,4000),
    del_one_by_one_bag(T2,4000,0),
    ets:delete(T2),
    T3 = ets_new(x,[duplicate_bag | Opts]),
    filltabint3(T3,4000),
    del_one_by_one_dbag_1(T3,1,4001),
    filltabint3(T3,4000),
    del_one_by_one_dbag_1(T3,4000,0),
    filltabint(T3,4000),
    filltabint3(T3,4000),
    del_one_by_one_dbag_2(T3,1,4001),
    filltabint(T3,4000),
    filltabint3(T3,4000),
    del_one_by_one_dbag_2(T3,4000,0),

    filltabint2(T3,4000),
    filltabint(T3,4000),
    del_one_by_one_dbag_3(T3,4000,0),
    ets:delete(T3),
    ok.

make_init_fun(N) when N > 4000->
    fun(read) ->
	    end_of_input;
       (close) ->
	    exit(close_not_expected)
    end;
make_init_fun(N) ->
    fun(read) ->
	    case N rem 2 of
		0 ->
		    {[{N, integer_to_list(N)}, {N, integer_to_list(N)}],
		     make_init_fun(N + 1)};
		1 ->
		    {[], make_init_fun(N + 1)}
	    end;
       (close) ->
	    exit(close_not_expected)
    end.

%% Test ets:init_table/2.
t_init_table(Config) when is_list(Config)->
    EtsMem = etsmem(),
    repeat_for_opts(fun t_init_table_do/1),
    verify_etsmem(EtsMem).

t_init_table_do(Opts) ->
    T = ets_new(x,[duplicate_bag | Opts]),
    filltabint(T,4000),
    ets:init_table(T, make_init_fun(1)),
    del_one_by_one_dbag_1(T,4000,0),
    ets:delete(T),
    ok.

do_fill_dbag_using_lists(T,0) ->
    T;
do_fill_dbag_using_lists(T,N) ->
    ets:insert(T,[{N,integer_to_list(N)},
		  {N + N rem 2,integer_to_list(N + N rem 2)}]),
    do_fill_dbag_using_lists(T,N - 1). 


%% Test the insert_new function.
t_insert_new(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    L = fill_sets_int(1000) ++ fill_sets_int(1000,[{write_concurrency,true}]),
    lists:foreach(fun(Tab) ->
			  false = ets:insert_new(Tab,{2,"2"}),
			  true = ets:insert_new(Tab,{2002,"2002"}),
			  false = ets:insert_new(Tab,{2002,"2002"}),
			  true = ets:insert(Tab,{2002,"2002"}),
			  false =  ets:insert_new(Tab,[{2002,"2002"}]),
			  false =  ets:insert_new(Tab,[{2002,"2002"},
						       {2003,"2003"}]),
			  false =  ets:insert_new(Tab,[{2001,"2001"},
						       {2002,"2002"},
						       {2003,"2003"}]),
			  false =  ets:insert_new(Tab,[{2001,"2001"},
						       {2002,"2002"}]),
			  true =  ets:insert_new(Tab,[{2001,"2001"},
						      {2003,"2003"}]),
			  false = ets:insert_new(Tab,{2001,"2001"}),
			  false = ets:insert_new(Tab,{2002,"2002"}),
			  false = ets:insert_new(Tab,{2003,"2003"}),
			  true = ets:insert_new(Tab,{2004,"2004"}),
			  true = ets:insert_new(Tab,{2000,"2000"}),
			  true = ets:insert_new(Tab,[{2005,"2005"},
						     {2006,"2006"},
						     {2007,"2007"}]),
			  Num =
			      case ets:info(Tab,type) of
				  bag ->
				      true =
					  ets:insert(Tab,{2004,"2004-2"}),
				      false =
					  ets:insert_new(Tab,{2004,"2004-3"}),
				      1009;
				  duplicate_bag ->
				      true =
					  ets:insert(Tab,{2004,"2004"}),
				      false =
					  ets:insert_new(Tab,{2004,"2004"}),
				      1010;
				  _ ->
				      1008
			      end,
			  Num = ets:info(Tab,size),
			  List = ets:tab2list(Tab),
			  ets:delete_all_objects(Tab),
			  true = ets:insert_new(Tab,List),
			  false = ets:insert_new(Tab,List),
			  ets:delete(Tab)
		  end,
		  L),
    verify_etsmem(EtsMem).

%% Test ets:insert/2 with list of objects into duplicate bag table.
t_insert_list(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts(fun t_insert_list_do/1),
    verify_etsmem(EtsMem).

t_insert_list_do(Opts) ->
    T = ets_new(x,[duplicate_bag | Opts]),
    do_fill_dbag_using_lists(T,4000),
    del_one_by_one_dbag_2(T,4000,0),
    ets:delete(T).

% Insert a long list twice in a bag
t_insert_list_bag(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts(fun t_insert_list_bag_do/1,
                    [write_concurrency, compressed]),
    verify_etsmem(EtsMem).

t_insert_list_bag_do(Opts) ->
    T = ets:new(t, [bag | Opts]),
    ListSize = 25000,
    List = [ {N} || N <- lists:seq(1, ListSize)],
    ets:insert(T, List),
    ets:insert(T, List),
    ListSize = ets:info(T, size),

    %% Insert different sized objects to better test (compressed) object comparison
    List2 = [begin Bits=(N rem 71), {N div 7, <<N:Bits>>} end || {N} <- List],
    ets:insert(T, List2),
    List2Sz = ListSize * 2,
    List2Sz = ets:info(T, size),
    ets:delete(T),
    ok.

% Insert a long list twice in a duplicate_bag
t_insert_list_duplicate_bag(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    T = ets:new(t, [duplicate_bag]),
    ListSize = 25000,
    List = [ {N} || N <- lists:seq(1, ListSize)],
    ets:insert(T, List),
    ets:insert(T, List),
    DoubleListSize = ListSize * 2,
    DoubleListSize = ets:info(T, size),
    ets:delete(T),
    verify_etsmem(EtsMem).

%% Test ets:insert/2 with list of objects into set tables.
t_insert_list_set(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts(fun t_insert_list_set_do/1, [set_types]),
    verify_etsmem(EtsMem).

t_insert_list_set_do(Opts) ->
    Nr = 2,
    t_insert_list_set_do(Opts, fun ets_insert_with_check/2, Nr, 1, Nr+1),
    t_insert_list_set_do(Opts, fun ets_insert_with_check/2, Nr*2, 2, Nr*2),
    InsertNewWithCheck =
        fun(T,E) ->
                Res = ets:insert_new(T,E),
                Seq = element(1, lists:nth(1, E)),
                case Seq rem 2 =:= 0 of
                    true -> Res = false;
                    false -> Res = true
                end
        end,
    t_insert_list_set_do(Opts, InsertNewWithCheck, Nr, 1, Nr),
    t_insert_list_set_do(Opts, fun ets:insert_new/2, Nr*2, 2, Nr*2),
    ok.

t_insert_list_set_do(Opts, InsertFun, Nr, Step, ExpectedSize) ->
    T = ets_new(x,Opts),
    [InsertFun(T,[{X,X}, {X+1,X}]) || X <- lists:seq(1,Nr,Step)],
    ExpectedSize = ets:info(T,size),
    ets:delete(T).

%% Test ets:insert/2 with list of objects into set tables in parallel.
t_insert_list_parallel(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts(fun t_insert_list_parallel_do/1, [[public], set_types]),
    verify_etsmem(EtsMem).

ets_insert_with_check(Table, ToInsert) ->
    true = ets:insert(Table, ToInsert),
    true.

ets_insert_new_with_check(Table, ToInsert) ->
    ExpectedRes =
        case put(is_first_insert_for_list, true) of
            undefined -> true;
            true -> false
        end,
    ExpectedRes = ets:insert_new(Table, ToInsert),
    ExpectedRes.

t_insert_list_parallel_do(Opts) ->
    [(fun(I) ->
             t_insert_list_parallel_do(Opts, I, 2, 100, 500),
             t_insert_list_parallel_do(Opts, I, 10, 100, 100),
             t_insert_list_parallel_do(Opts, I, 1000, 100, 10),
             t_insert_list_parallel_do(Opts, I, 50000, 3, 1)
      end)(InsertFun) || InsertFun <- [fun ets_insert_with_check/2,
                                       fun ets_insert_new_with_check/2]].

t_insert_list_parallel_do(Opts, InsertFun, ListLength, NrOfProcesses, NrOfInsertsPerProcess) ->
    T = ets_new(x,Opts),
    t_insert_list_parallel_do_helper(self(), T, 0, InsertFun, ListLength, NrOfProcesses, NrOfInsertsPerProcess),
    receive done -> ok end,
    ExpectedSize = ListLength * NrOfProcesses,
    ExpectedSize = length(ets:match_object(T, {'$0', '$1'})),
    ExpectedSize = ets:info(T, size),
    ets:delete(T),
    ok.

t_insert_list_delete_parallel(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts(fun t_insert_list_delete_parallel_do/1, [[public], set_types]),
    verify_etsmem(EtsMem).

t_insert_list_delete_parallel_do(Opts) ->
    [(fun(I) ->
              t_insert_list_delete_parallel_do(Opts, I, 30, 32, 1000000),
              t_insert_list_delete_parallel_do(Opts, I, 300, 8, 1000000),
              t_insert_list_delete_parallel_do(Opts, I, 3000, 4, 1000000),
              t_insert_list_delete_parallel_do(Opts, I, 9000, 4, 1000000)
      end)(InsertFun) || InsertFun <- [fun ets_insert_with_check/2,
                                       fun ets_insert_new_with_check/2]],
    ok.

t_insert_list_delete_parallel_do(Opts, InsertFun, ListLength, NrOfProcesses, NrOfInsertsPerProcess) ->
    T = ets_new(x,Opts),
    CompletedInsertsCtr = counters:new(1,[]),
    NewInsertFun =
        fun(Table, ToInsert) ->
                try
                    InsertFun(Table, ToInsert),
                    counters:add(CompletedInsertsCtr, 1, 1)
                catch
                    error:badarg -> put(stop,yes)
                end
        end,
    Self = self(),
    spawn(fun()->
                  t_insert_list_parallel_do_helper(self(), T, 0, NewInsertFun, ListLength, NrOfProcesses, NrOfInsertsPerProcess),
                  receive done -> Self ! done_parallel_insert end
          end),
    receive after 3 -> ok end,
    spawn(fun()->
                  spawn(fun()->
                                receive after 7 -> ok end,
                                ets:delete(T),
                                Self ! done_delete
                        end)
          end),
    receive done_delete -> ok end,
    receive done_parallel_insert -> ok end,
    io:format("~p/~p completed",
              [counters:get(CompletedInsertsCtr, 1),
               NrOfProcesses * NrOfInsertsPerProcess]).


t_insert_list_parallel_do_helper(Parent, T, StartKey, InsertFun, ListLength, 1, NrOfInsertsPerProcess) ->
    try
        repeat(fun()->
                       case get(stop) of
                           yes -> throw(end_repeat);
                           _ -> ok
                       end,
                       InsertFun(T,[{X,X} || X <- lists:seq(StartKey,StartKey+ListLength-1,1)])
               end, NrOfInsertsPerProcess)
    catch
        throw:end_repeat -> ok
    end,
    Parent ! done;
t_insert_list_parallel_do_helper(Parent, T, StartKey, InsertFun, ListLength, NrOfProcesses, NrOfInsertsPerProcess) ->
    Self = self(),
    spawn(fun() ->
                  t_insert_list_parallel_do_helper(Self,
                                                   T,
                                                   StartKey,
                                                   InsertFun,
                                                   ListLength,
                                                   NrOfProcesses div 2,
                                                   NrOfInsertsPerProcess) end),
    spawn(fun() ->
                  t_insert_list_parallel_do_helper(Self,
                                                   T,
                                                   StartKey + ListLength*(NrOfProcesses div 2),
                                                   InsertFun,
                                                   ListLength,
                                                   (NrOfProcesses div 2) + (NrOfProcesses rem 2),
                                                   NrOfInsertsPerProcess)
          end),
    receive done -> ok end,
    receive done -> ok end,
    Parent ! done.

t_insert_list_delete_set(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts(fun t_insert_list_delete_set_do/1, [[public],set_types]),
    verify_etsmem(EtsMem).

t_insert_list_delete_set_do(Opts) ->
    [(fun(I) ->
              t_insert_list_delete_set_do(Opts, I, 1000000, 1, 1),
              t_insert_list_delete_set_do(Opts, I, 100000, 10, 5),
              t_insert_list_delete_set_do(Opts, I, 10000, 100, 50),
              t_insert_list_delete_set_do(Opts, I, 1000, 1000, 500)
      end)(InsertFun) || InsertFun <- [fun ets_insert_with_check/2,
                                       fun ets_insert_new_with_check/2]],
    ok.


t_insert_list_delete_set_do(Opts, InsertFun, ListLength, NrOfTables, NrOfInserts) ->
    CompletedInsertsCtr = counters:new(1,[]),
    Parent = self(),
    [(fun() ->
              T = ets_new(x,Opts),
              spawn(
                fun() ->
                        try
                            repeat(
                              fun() ->
                                      InsertFun(T,[{Z,Z} ||
                                                      Z <- lists:seq(1,ListLength)]),
                                      counters:add(CompletedInsertsCtr, 1, 1)%,
                              end, NrOfInserts)
                        catch
                            error:badarg -> ok
                        end,
                        Parent ! done
                end),
              receive after 1 -> ok end,
              ets:delete(T)
      end)() || _ <- lists:seq(1,NrOfTables)],
    [receive done -> ok end || _ <- lists:seq(1,NrOfTables)],
    io:format("~p/~p completed",
              [counters:get(CompletedInsertsCtr, 1),
               NrOfTables * NrOfInserts]).


t_insert_list_kill_process(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts(fun t_insert_list_kill_process_do/1, [[public], set_types]),
    verify_etsmem(EtsMem).


t_insert_list_kill_process_do(Opts) ->
    [(fun(I) ->
              [(fun(Time) ->
                        T = ets_new(x,Opts),
                        List = lists:seq(1,600000),
                        TupleList = [{E,E} || E <- List],
                        Pid = spawn(fun() -> I(T, TupleList) end),
                        receive after Time -> ok end,
                        exit(Pid, kill),
                        ets:delete(T)
                end)(TheTime) || TheTime <- [1,3,5] ++ lists:seq(7,29,7)]
      end)(InsertFun) || InsertFun <- [fun ets:insert/2,
                                       fun ets:insert_new/2]],
    ok.

%% Test interface of ets:test_ms/2.
t_test_ms(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    {ok,[a,b]} = ets:test_ms({a,b},
			     [{{'$1','$2'},[{'<','$1','$2'}],['$$']}]),
    {ok,false} = ets:test_ms({a,b},
			     [{{'$1','$2'},[{'>','$1','$2'}],['$$']}]),
    Tpl = {a,gb_sets:new()},
    {ok,Tpl} = ets:test_ms(Tpl, [{{'_','_'},  [], ['$_']}]), % OTP-10190
    {error,[{error,String}]} = ets:test_ms({a,b},
					   [{{'$1','$2'},
					     [{'flurp','$1','$2'}],
					     ['$$']}]),
    true = (if is_list(String) -> true; true -> false end),
    verify_etsmem(EtsMem).

%% Test the select reverse BIFs.
t_select_reverse(Config) when is_list(Config) ->
    Table = ets_new(xxx, [ordered_set]),
    filltabint(Table,1000),
    A = lists:reverse(ets:select(Table,[{{'$1', '_'},
					 [{'>',
					   {'rem',
					    '$1', 5},
					   2}],
					 ['$_']}])),
    A = ets:select_reverse(Table,[{{'$1', '_'},
				   [{'>',
				     {'rem',
				      '$1', 5},
				     2}],
				   ['$_']}]),
    A = reverse_chunked(Table,[{{'$1', '_'},
				[{'>',
				  {'rem',
				   '$1', 5},
				  2}],
				['$_']}],3),
    %% A set/bag/duplicate_bag should get the same result regardless
    %% of select or select_reverse
    Table2 = ets_new(xxx, [set]),
    filltabint(Table2,1000),
    Table3 = ets_new(xxx, [bag]),
    filltabint(Table3,1000),
    Table4 = ets_new(xxx, [duplicate_bag]),
    filltabint(Table4,1000),
    lists:map(fun(Tab) ->
		      B = ets:select(Tab,[{{'$1', '_'},
					   [{'>',
					     {'rem',
					      '$1', 5},
					     2}],
					   ['$_']}]),
		      B = ets:select_reverse(Tab,[{{'$1', '_'},
						   [{'>',
						     {'rem',
						      '$1', 5},
						     2}],
						   ['$_']}])
	      end,[Table2, Table3, Table4]),
    ok.



reverse_chunked(T,MS,N) ->
    do_reverse_chunked(ets:select_reverse(T,MS,N),[]).

do_reverse_chunked('$end_of_table',Acc) ->
    lists:reverse(Acc);
do_reverse_chunked({L,C},Acc) ->
    NewAcc = lists:reverse(L)++Acc,
    do_reverse_chunked(ets:select_reverse(C), NewAcc).


%% Test the ets:select_delete/2 and ets:select_count/2 BIFs.
t_select_delete(Config) when is_list(Config) ->
    ct:timetrap({minutes,30}), %% valgrind needs a lot
    EtsMem = etsmem(),
    Tables = fill_sets_int(10000) ++ fill_sets_int(10000,[{write_concurrency,true}]),
    lists:foreach
      (fun(Table) ->
	       4000 = ets:select_count(Table,[{{'$1', '_'},
					       [{'>',
						 {'rem',
						  '$1', 5},
						 2}],
					       [true]}]),
	       4000 = ets:select_delete(Table,[{{'$1', '_'},
						[{'>',
						  {'rem',
						   '$1', 5},
						  2}],
						[true]}]),
	       check(Table,
		     fun({N,_}) when (N rem 5) =< 2 ->
			     true;
			(_) ->
			     false
		     end,
		     6000)

       end,
       Tables),
    lists:foreach
      (fun(Table) ->
	       ets:select_delete(Table,[{'_',[],[true]}]),
	       xfilltabint(Table,4000),
	       successive_delete(Table,1,4001,bound),
	       0 = ets:info(Table,size),
	       xfilltabint(Table,4000),
	       successive_delete(Table,4000,0, bound),
	       0 = ets:info(Table,size),
	       xfilltabint(Table,4000),
	       successive_delete(Table,1,4001,unbound),
	       0 = ets:info(Table,size),
	       xfilltabint(Table,4000),
	       successive_delete(Table,4000,0, unbound),
	       0 = ets:info(Table,size)

       end,
       Tables),
    lists:foreach
      (fun(Table) ->
	       F = case ets:info(Table,type) of
		       X when X == bag; X == duplicate_bag ->
			   2;
		       _ -> 
			   1
		   end,
	       xfilltabstr(Table, 4000),
	       1000 = ets:select_count(Table,
				       [{{[$3 | '$1'], '_'},
					 [{'==',
					   {'length', '$1'},
					   3}],[true]}]) div F,
	       1000 = ets:select_delete(Table,
					[{{[$3 | '$1'], '_'},
					  [{'==',
					    {'length', '$1'},
					    3}],[true]}]) div F,
	       check(Table, fun({[3,_,_,_],_}) -> false;
			       (_) -> true
			    end, 3000*F),
	       8 = ets:select_count(Table,
				    [{{"7",'_'},[],[false]},
				     {{['_'], '_'},
				      [],[true]}]) div F,
	       8 = ets:select_delete(Table,
				     [{{"7",'_'},[],[false]},
				      {{['_'], '_'},
				       [],[true]}]) div F,
	       check(Table, fun({"7",_}) -> true;
			       ({[_],_}) -> false;
			       (_) -> true
			    end, 2992*F),
	       xfilltabstr(Table, 4000),
	       %% This happens to be interesting for other select types too
	       200 = length(ets:select(Table,
				       [{{[$3,'_','_'],'_'},
					 [],[true]},
					{{[$1,'_','_'],'_'},
					 [],[true]}])) div F,
	       200 = ets:select_count(Table,
				      [{{[$3,'_','_'],'_'},
					[],[true]},
				       {{[$1,'_','_'],'_'},
					[],[true]}]) div F,
	       200 = length(element(1,ets:select(Table,
						 [{{[$3,'_','_'],'_'},
						   [],[true]},
						  {{[$1,'_','_'],'_'},
						   [],[true]}],
						 1000))) div F,
	       200 = length(
		       ets:select_reverse(Table,
					  [{{[$3,'_','_'],'_'},
					    [],[true]},
					   {{[$1,'_','_'],'_'},
					    [],[true]}])) div F,
	       200 = length(
		       element(1,
			       ets:select_reverse
				 (Table,
				  [{{[$3,'_','_'],'_'},
				    [],[true]},
				   {{[$1,'_','_'],'_'},
				    [],[true]}],
				  1000))) div F,
	       200 = ets:select_delete(Table,
				       [{{[$3,'_','_'],'_'},
					 [],[true]},
					{{[$1,'_','_'],'_'},
					 [],[true]}]) div F,
	       0 = ets:select_count(Table,
				    [{{[$3,'_','_'],'_'},
				      [],[true]},
				     {{[$1,'_','_'],'_'},
				      [],[true]}]) div F,
	       check(Table, fun({[$3,_,_],_}) -> false;
			       ({[$1,_,_],_}) -> false;
			       (_) -> true
			    end, 3800*F)
       end,
       Tables),
    lists:foreach(fun(Tab) -> ets:delete(Tab) end,Tables),
    verify_etsmem(EtsMem).

%% Tests the ets:select_replace/2 BIF
t_select_replace(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts(fun do_select_replace/1),
    verify_etsmem(EtsMem).

do_select_replace(Opts) ->
    Tables = fill_sets_intup(10000, Opts),

    TestFun = fun (Table, TableType) when TableType =:= bag ->
                      % Operation not supported; bag implementation
                      % presented both semantic consistency and performance issues.
                      10000 = ets:select_delete(Table, [{'_',[],[true]}]);

                  (Table, TableType) ->
                      % Invalid replacement doesn't keep the key
                      MatchSpec1 = [{{{'$1','$3'}, '$2'},
                                     [{'=:=', {'band', '$1', 2#11}, 2#11},
                                      {'=/=', {'hd', '$2'}, $x}],
                                     [{{{{'$2','$3'}}, '$1'}}]}],
                      {'EXIT',{badarg,_}} = (catch ets:select_replace(Table, MatchSpec1)),

                      % Invalid replacement doesn't keep the key (even though it would be the same value)
                      MatchSpec2 = [{{{'$1','$3'}, '$2'},
                                     [{'=:=', {'band', '$1', 2#11}, 2#11}],
                                     [{{{{{'+', '$1', 0},'$3'}}, '$2'}}]},
                                    {{{'$1','$3'}, '$2'},
                                     [{'=/=', {'band', '$1', 2#11}, 2#11}],
                                     [{{{{{'-', '$1', 0},'$3'}}, '$2'}}]}],
                      {'EXIT',{badarg,_}} = (catch ets:select_replace(Table, MatchSpec2)),

                      % Invalid replacement changes key to float equivalent
                      MatchSpec3 = [{{{'$1','$3'}, '$2'},
                                     [{'=:=', {'band', '$1', 2#11}, 2#11},
                                      {'=/=', {'hd', '$2'}, $x}],
                                     [{{{{{'*', '$1', 1.0},'$3'}}, '$2'}}]}],
                      {'EXIT',{badarg,_}} = (catch ets:select_replace(Table, MatchSpec3)),

                      % Replacements are differently-sized tuples
                      MatchSpec4_A = [{{{'$1','$3'},'$2'},
                                       [{'<', {'rem', '$1', 5}, 2}],
                                       [{{{{'$1','$3'}}, [$x | '$2'], stuff}}]}],
                      MatchSpec4_B = [{{{'$1','$3'},'$2','_'},
                                       [],
                                       [{{{{'$1','$3'}},'$2'}}]}],
                      4000 = ets:select_replace(Table, MatchSpec4_A),
                      4000 = ets:select_replace(Table, MatchSpec4_B),

                      % Replacement is the same tuple
                      MatchSpec5 = [{{{'$1','$3'}, '$2'},
                                     [{'>', {'rem', '$1', 5}, 3}],
                                     ['$_']}],
                      2000 = ets:select_replace(Table, MatchSpec5),

                      % Replacement reconstructs an equal tuple
                      MatchSpec6 = [{{{'$1','$3'}, '$2'},
                                     [{'>', {'rem', '$1', 5}, 3}],
                                     [{{{{'$1','$3'}}, '$2'}}]}],
                      2000 = ets:select_replace(Table, MatchSpec6),

                      % Replacement uses {element,KeyPos,T} for key
                      2000 = ets:select_replace(Table,
                                                [{{{'$1','$3'}, '$2'},
                                                  [{'>', {'rem', '$1', 5}, 3}],
                                                  [{{{element, 1, '$_'}, '$2'}}]}]),

                      % Replacement uses wrong {element,KeyPos,T} for key
                      {'EXIT',{badarg,_}} = (catch ets:select_replace(Table,
                                                                     [{{{'$1','$3'}, '$2'},
                                                                       [],
                                                                       [{{{element, 2, '$_'}, '$2'}}]}])),

                      check(Table,
                            fun ({{N,_}, [$x, C | _]}) when ((N rem 5) < 2) -> (C >= $0) andalso (C =< $9);
                                ({{N,_}, [C | _]}) when is_float(N) -> (C >= $0) andalso (C =< $9);
                                ({{N,_}, [C | _]}) when ((N rem 5) > 3) -> (C >= $0) andalso (C =< $9);
                                ({_, [C | _]}) -> (C >= $0) andalso (C =< $9)
                            end,
                            10000),

                      % Replace unbound range (>)
                      MatchSpec7 = [{{{'$1','$3'}, '$2'},
                                     [{'>', '$1', 7000}],
                                     [{{{{'$1','$3'}}, {{gt_range, '$2'}}}}]}],
                      3000 = ets:select_replace(Table, MatchSpec7),

                      % Replace unbound range (<)
                      MatchSpec8 = [{{{'$1','$3'}, '$2'},
                                     [{'<', '$1', 3000}],
                                     [{{{{'$1','$3'}}, {{le_range, '$2'}}}}]}],
                      case TableType of
                          ordered_set ->   2999 = ets:select_replace(Table, MatchSpec8);
                          set ->           2999 = ets:select_replace(Table, MatchSpec8);
                          duplicate_bag -> 2998 = ets:select_replace(Table, MatchSpec8)
                      end,

                      % Replace bound range
                      MatchSpec9 = [{{{'$1','$3'}, '$2'},
                                     [{'>=', '$1', 3001},
                                      {'<', '$1', 7000}],
                                     [{{{{'$1','$3'}}, {{range, '$2'}}}}]}],
                      case TableType of
                          ordered_set ->   3999 = ets:select_replace(Table, MatchSpec9);
                          set ->           3999 = ets:select_replace(Table, MatchSpec9);
                          duplicate_bag -> 3998 = ets:select_replace(Table, MatchSpec9)
                      end,

                      % Replace particular keys
                      MatchSpec10 = [{{{'$1','$3'}, '$2'},
                                     [{'==', '$1', 3000}],
                                     [{{{{'$1','$3'}}, {{specific1, '$2'}}}}]},
                                    {{{'$1','$3'}, '$2'},
                                     [{'==', '$1', 7000}],
                                     [{{{{'$1','$3'}}, {{specific2, '$2'}}}}]}],
                      case TableType of
                          ordered_set ->   2 = ets:select_replace(Table, MatchSpec10);
                          set ->           2 = ets:select_replace(Table, MatchSpec10);
                          duplicate_bag -> 4 = ets:select_replace(Table, MatchSpec10)
                      end,

                      check(Table,
                            fun ({{N,_}, {gt_range, _}}) -> N > 7000;
                                ({{N,_}, {le_range, _}}) -> N < 3000;
                                ({{N,_}, {range, _}}) -> (N >= 3001) andalso (N < 7000);
                                ({{N,_}, {specific1, _}}) -> N == 3000;
                                ({{N,_}, {specific2, _}}) -> N == 7000
                            end,
                            10000),

                      10000 = ets:select_delete(Table, [{'_',[],[true]}]),
                      check(Table, fun (_) -> false end, 0)
              end,

    lists:foreach(
      fun(Table) ->
              TestFun(Table, ets:info(Table, type)),
              ets:delete(Table)
      end,
      Tables),

    %% Test key-safe match-specs are accepted
    BigNum = (123 bsl 123),
    RefcBin = list_to_binary(lists:seq(1,?heap_binary_size+1)),
    Terms = [a, "hej", 123, 1.23, BigNum , <<"123">>, RefcBin, TestFun, self()],
    EqPairs = fun(X,Y) ->
                      [{ '$1', '$1'},
                       { {X, Y}, {{X, Y}}},
                       { {'$1', Y}, {{'$1', Y}}},
                       { {{X, Y}}, {{{{X, Y}}}}},
                       { {X}, {{X}}},
                       { X, {const, X}},
                       { {X,Y}, {const, {X,Y}}},
                       { {X}, {const, {X}}},
                       { {X, Y}, {{X, {const, Y}}}},
                       { {X, {Y,'$1'}}, {{{const, X}, {{Y,'$1'}}}}},
                       { [X, Y | '$1'], [X, Y | '$1']},
                       { [{X, '$1'}, Y], [{{X, '$1'}}, Y]},
                       { [{X, Y} | '$1'], [{const, {X, Y}} | '$1']},
                       { [$p,$r,$e,$f,$i,$x | '$1'], [$p,$r,$e,$f,$i,$x | '$1']},
                       { {[{X,Y}]}, {{[{{X,Y}}]}}},
                       { {[{X,Y}]}, {{{const, [{X,Y}]}}}},
                       { {[{X,Y}]}, {{[{const,{X,Y}}]}}}
                      ]
              end,

    T2 = ets:new(x, Opts),
    [lists:foreach(fun({A, B}) ->
                           %% just check that matchspec is accepted
                           0 = ets:select_replace(T2, [{{A, '$2', '$3'}, [], [{{B, '$3', '$2'}}]}])
                   end,
                   EqPairs(X,Y)) || X <- Terms, Y <- Terms],

    %% Test key-unsafe matchspecs are rejected
    NeqPairs = fun(X, Y) ->
                      [{'$1', '$2'},
                       {{X, Y}, {X, Y}},
                       {{{X, Y}}, {{{X, Y}}}},
                       {{X}, {{{X}}}},
                       {{const, X}, {const, X}},
                       {{const, {X,Y}}, {const, {X,Y}}},
                       {'$1', {const, '$1'}},
                       {{X}, {const, {{X}}}},
                       {{X, {Y,'$1'}}, {{{const, X}, {Y,'$1'}}}},
                       {[X, Y | '$1'], [X, Y]},
                       {[X, Y], [X, Y | '$1']},
                       {[{X, '$1'}, Y], [{X, '$1'}, Y]},
                       {[$p,$r,$e,$f,$i,$x | '$1'], [$p,$r,$e,$f,$I,$x | '$1']},
                       { {[{X,Y}]}, {{[{X,Y}]}}},
                       { {[{X,Y}]}, {{{const, [{{X,Y}}]}}}},
                       { {[{X,Y}]}, {{[{const,{{X,Y}}}]}}},
                       {'_', '_'},
                       {'$_', '$_'},
                       {'$$', '$$'},
                       {#{}, #{}},
                       {#{X => '$1'}, #{X => '$1'}}
                      ]
              end,

    [lists:foreach(fun({A, B}) ->
                           %% just check that matchspec is rejected
                           {'EXIT',{badarg,_}} = (catch ets:select_replace(T2, [{{A, '$2', '$3'}, [], [{{B, '$3', '$2'}}]}]))
                   end,
                   NeqPairs(X,Y)) || X <- Terms, Y <- Terms],


    %% Wrap entire tuple with 'const'
    [[begin
          Old = {Key, 1, 2},
          ets:insert(T2, Old),
          1 = ets:select_replace(T2, [{Old, [], [{const, New}]}]),
          [New] = ets:lookup(T2, Key),
          ets:delete(T2, Key)
      end || New <- [{Key, 1, 2}, {Key, 3, 4}, {Key, 1}, {Key, 1, 2, 3}, {Key}]
     ]
     || Key <- [{1, tuple}, {nested, {tuple, {a,b}}} | Terms]],

    %% 'const' wrap does not work with maps or variables in keys
    [[begin
          Old = {Key, 1, 2},
          {'EXIT',{badarg,_}} = (catch ets:select_replace(T2, [{Old, [], [{const, New}]}]))
      end || New <- [{Key, 1, 2}, {Key, 3, 4}, {Key, 1}, {Key, 1, 2, 3}, {Key}]
     ]
     || Key <- [#{a => 1}, {nested, #{a => 1}}, '$1']],


    ets:delete(T2),
    ok.

%% OTP-15346: Bug caused select_replace of bound key to corrupt static stack
%% used by ets:next and ets:prev.
t_select_replace_next_bug(Config) when is_list(Config) ->
    T = ets:new(k, [ordered_set]),
    [ets:insert(T, {I, value}) || I <- lists:seq(1,10)],
    1 = ets:first(T),

    %% Make sure select_replace does not leave pointer
    %% to deallocated {2,value} in static stack.
    MS = [{{2,value}, [], [{{2,"new_value"}}]}],
    1 = ets:select_replace(T, MS),

    %% This would crash or give wrong result at least on DEBUG emulator
    %% where deallocated memory is overwritten.
    2 = ets:next(T, 1),

    ets:delete(T).


%% Test that partly bound keys gives faster matches.
partly_bound(Config) when is_list(Config) ->
    case os:type() of
	{win32,_} ->
	    {skip,"Inaccurate measurements on Windows"};
	_ ->
	    EtsMem = etsmem(),
	    dont_make_worse(),
	    make_better(),
	    verify_etsmem(EtsMem)
    end.

dont_make_worse() ->
    seventyfive_percent_success(fun dont_make_worse_sub/0, 0, 0, 10).

dont_make_worse_sub() ->
    T = build_table([a,b],[a,b],15000),
    T1 = time_match_object(T,{'_',a,a,1500}, [{{a,a,1500},a,a,1500}]),
    T2 = time_match_object(T,{{a,a,'_'},a,a,1500},
			   [{{a,a,1500},a,a,1500}]),
    ets:delete(T),
    true = (T1 > T2),
    ok.

make_better() ->
    fifty_percent_success(fun make_better_sub2/0, 0, 0, 10),
    fifty_percent_success(fun make_better_sub1/0, 0, 0, 10).

make_better_sub1() ->
    T = build_table2([a,b],[a,b],15000),
    T1 = time_match_object(T,{'_',1500,a,a}, [{{1500,a,a},1500,a,a}]),
    T2 = time_match_object(T,{{1500,a,'_'},1500,a,a},
			   [{{1500,a,a},1500,a,a}]),
    ets:delete(T),
    io:format("~p>~p~n",[(T1 / 100),T2]),
    true = ((T1 / 100) > T2), % More marginal than needed.
    ok.

make_better_sub2() ->
    T = build_table2([a,b],[a,b],15000),
    T1 = time_match(T,{'$1',1500,a,a}),
    T2 = time_match(T,{{1500,a,'$1'},1500,a,a}),
    ets:delete(T),
    io:format("~p>~p~n",[(T1 / 100),T2]),
    true = ((T1 / 100) > T2), % More marginal than needed.
    ok.


%% Heavy random matching, comparing set with ordered_set.
match_heavy(Config) when is_list(Config) ->
    PrivDir = proplists:get_value(priv_dir,Config),
    DataDir = proplists:get_value(data_dir, Config),
    %% Easier to have in process dictionary when manually
    %% running the test function.
    put(where_to_read,DataDir),
    put(where_to_write,PrivDir),
    random_test(),
    drop_match(),
    ok.

%%% Extra safety for the very low probability that this is not
%%% caught by the random test (Statistically impossible???) 
drop_match() ->
    EtsMem = etsmem(),
    T = build_table([a,b],[a],1500),
    [{{a,a,1},a,a,1},{{b,a,1},b,a,1}] =
	ets:match_object(T, {'_','_','_',1}),
    true = ets:delete(T),
    verify_etsmem(EtsMem).



ets_match(Tab,Expr) ->
    case rand:uniform(2) of
	1 ->
	    ets:match(Tab,Expr);
	_ ->
	    match_chunked(Tab,Expr)
    end.

match_chunked(Tab,Expr) ->
    match_chunked_collect(ets:match(Tab,Expr,
				    rand:uniform(1999) + 1)).
match_chunked_collect('$end_of_table') ->
    [];
match_chunked_collect({Results, Continuation}) ->
    Results ++ match_chunked_collect(ets:match(Continuation)).

ets_match_object(Tab,Expr) ->
    case rand:uniform(2) of
	1 ->
	    ets:match_object(Tab,Expr);
	_ ->
	    match_object_chunked(Tab,Expr)
    end.

match_object_chunked(Tab,Expr) ->
    match_object_chunked_collect(ets:match_object(Tab,Expr,
						  rand:uniform(1999) + 1)).
match_object_chunked_collect('$end_of_table') ->
    [];
match_object_chunked_collect({Results, Continuation}) ->
    Results ++ match_object_chunked_collect(ets:match_object(Continuation)).



random_test() ->
    ReadDir = get(where_to_read),
    WriteDir = get(where_to_write),
    (catch file:make_dir(WriteDir)),
    case file:consult(filename:join([ReadDir,"preset_random_seed.txt"])) of
	{ok,[X]} ->
	    rand:seed(X);
	_ ->
	    rand:seed(default)
    end,
    Seed = rand:export_seed(),
    {ok,F} = file:open(filename:join([WriteDir,"last_random_seed.txt"]),
		       [write]),
    io:format(F,"~p. ~n",[Seed]),
    file:close(F),
    io:format("Random seed ~p written to ~s, copy to ~s to rerun with "
	      "same seed.",[Seed, 
			    filename:join([WriteDir, "last_random_seed.txt"]),
			    filename:join([ReadDir, 
					   "preset_random_seed.txt"])]),
    do_random_test().

do_random_test() ->
    EtsMem = etsmem(),
    OrdSet = ets_new(xxx,[ordered_set]),
    Set = ets_new(xxx,[]),
    do_n_times(fun() ->
		       Key = create_random_string(25),
		       Value = create_random_tuple(25),
		       ets:insert(OrdSet,{Key,Value}),
		       ets:insert(Set,{Key,Value})
	       end, 5000),
    io:format("~nData inserted~n"),
    do_n_times(fun() ->
		       I = rand:uniform(25),
		       Key = create_random_string(I) ++ '_',
		       L1 = ets_match_object(OrdSet,{Key,'_'}),
		       L2 = lists:sort(ets_match_object(Set,{Key,'_'})),
		       case L1 == L2 of
			   false ->
			       io:format("~p != ~p~n",
					 [L1,L2]),
			       exit({not_eq, L1, L2});
			   true ->
			       ok
		       end
	       end,
	       2000),
    io:format("~nData matched~n"),
    ets:match_delete(OrdSet,'_'),
    ets:match_delete(Set,'_'),
    do_n_times(fun() ->
		       Value = create_random_string(25),
		       Key = create_random_tuple(25),
		       ets:insert(OrdSet,{Key,Value}),
		       ets:insert(Set,{Key,Value})
	       end, 2000),
    io:format("~nData inserted~n"),
    (fun() ->
	     Key = list_to_tuple(lists:duplicate(25,'_')),
	     L1 = ets_match_object(OrdSet,{Key,'_'}),
	     L2 = lists:sort(ets_match_object(Set,{Key,'_'})),
	     2000 = length(L1),
	     case L1 == L2 of
		 false ->
		     io:format("~p != ~p~n",
			       [L1,L2]),
		     exit({not_eq, L1, L2});
		 true ->
		     ok
	     end
     end)(),
    (fun() ->
	     Key = {'$1','$2','$3','$4',
		    '$5','$6','$7','$8',
		    '$9','$10','$11','$12',
		    '$13','$14','$15','$16',
		    '$17','$18','$19','$20',
		    '$21','$22','$23','$24',
		    '$25'},
	     L1 = ets_match_object(OrdSet,{Key,'_'}),
	     L2 = lists:sort(ets_match_object(Set,{Key,'_'})),
	     2000 = length(L1),
	     case L1 == L2 of
		 false ->
		     io:format("~p != ~p~n",
			       [L1,L2]),
		     exit({not_eq, L1, L2});
		 true ->
		     ok
	     end
     end)(),
    (fun() ->
	     Key = {'$1','$2','$3','$4',
		    '$5','$6','$7','$8',
		    '$9','$10','$11','$12',
		    '$13','$14','$15','$16',
		    '$17','$18','$19','$20',
		    '$21','$22','$23','$24',
		    '$25'},
	     L1 = ets_match(OrdSet,{Key,'_'}),
	     L2 = lists:sort(ets_match(Set,{Key,'_'})),
	     2000 = length(L1),
	     case L1 == L2 of
		 false ->
		     io:format("~p != ~p~n",
			       [L1,L2]),
		     exit({not_eq, L1, L2});
		 true ->
		     ok
	     end
     end)(),
    ets:match_delete(OrdSet,'_'),
    ets:match_delete(Set,'_'),
    do_n_times(fun() ->
		       Value = create_random_string(25),
		       Key = create_random_tuple(25),
		       ets:insert(OrdSet,{Key,Value}),
		       ets:insert(Set,{Key,Value})
	       end, 2000),
    io:format("~nData inserted~n"),
    do_n_times(fun() ->
		       Key = create_partly_bound_tuple(25),
		       L1 = ets_match_object(OrdSet,{Key,'_'}),
		       L2 = lists:sort(ets_match_object(Set,{Key,'_'})),
		       case L1 == L2 of
			   false ->
			       io:format("~p != ~p~n",
					 [L1,L2]),
			       exit({not_eq, L1, L2});
			   true ->
			       ok
		       end
	       end,
	       2000),
    do_n_times(fun() ->
		       Key = create_partly_bound_tuple2(25),
		       L1 = ets_match_object(OrdSet,{Key,'_'}),
		       L2 = lists:sort(ets_match_object(Set,{Key,'_'})),
		       case L1 == L2 of
			   false ->
			       io:format("~p != ~p~n",
					 [L1,L2]),
			       exit({not_eq, L1, L2});
			   true ->
			       ok
		       end
	       end,
	       2000),
    do_n_times(fun() ->
		       Key = create_partly_bound_tuple2(25),
		       L1 = ets_match(OrdSet,{Key,'_'}),
		       L2 = lists:sort(ets_match(Set,{Key,'_'})),
		       case L1 == L2 of
			   false ->
			       io:format("~p != ~p~n",
					 [L1,L2]),
			       exit({not_eq, L1, L2});
			   true ->
			       ok
		       end
	       end,
	       2000),
    io:format("~nData matched~n"),
    ets:match_delete(OrdSet,'_'),
    ets:match_delete(Set,'_'),
    do_n_times(fun() ->
		       do_n_times(fun() ->
					  Value =
					      create_random_string(25),
					  Key = create_random_tuple(25),
					  ets:insert(OrdSet,{Key,Value}),
					  ets:insert(Set,{Key,Value})
				  end, 500),
		       io:format("~nData inserted~n"),
		       do_n_times(fun() ->
					  Key =
					      create_partly_bound_tuple(25),
					  ets:match_delete(OrdSet,{Key,'_'}),
					  ets:match_delete(Set,{Key,'_'}),
					  L1 = ets:info(OrdSet,size),
					  L2 = ets:info(Set,size),
					  [] = ets_match_object(OrdSet,
								{Key,'_'}),
					  case L1 == L2 of
					      false ->
						  io:format("~p != ~p "
							    "(deleted ~p)~n",
							    [L1,L2,Key]),
						  exit({not_eq, L1, L2,
							{deleted,Key}});
					      true ->
						  ok
					  end
				  end,
				  50),
		       io:format("~nData deleted~n")
	       end,
	       10),
    ets:delete(OrdSet),
    ets:delete(Set),
    verify_etsmem(EtsMem).

%% Test various variants of update_element.
update_element(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts(fun update_element_opts/1),
    verify_etsmem(EtsMem).

update_element_opts(Opts) ->
    TupleCases = [{{key,val}, 1 ,2},
		  {{val,key}, 2, 1},
		  {{key,val}, 1 ,[2]},
		  {{key,val,val}, 1, [2,3]},
		  {{val,key,val,val}, 2, [3,4,1]},
		  {{val,val,key,val}, 3, [1,4,1,2]}, % update pos1 twice
		  {{val,val,val,key}, 4, [2,1,2,3]}],% update pos2 twice

    lists:foreach(fun({Tuple,KeyPos,UpdPos}) -> update_element_opts(Tuple,KeyPos,UpdPos,Opts) end,
		  TupleCases),

    update_element_neg(Opts).



update_element_opts(Tuple,KeyPos,UpdPos,Opts) ->
    Set = ets_new(set,[{keypos,KeyPos} | Opts]),
    OrdSet = ets_new(ordered_set,[ordered_set,{keypos,KeyPos} | Opts]),
    update_element(Set,Tuple,KeyPos,UpdPos),
    update_element(OrdSet,Tuple,KeyPos,UpdPos),
    true = ets:delete(Set),
    true = ets:delete(OrdSet),
    ok.

update_element(T,Tuple,KeyPos,UpdPos) ->
    KeyList = [17,"seventeen",<<"seventeen">>,{17},list_to_binary(lists:seq(1,100)),make_ref(), self()],
    lists:foreach(fun(Key) ->
			  TupleWithKey = setelement(KeyPos,Tuple,Key),
			  update_element_do(T,TupleWithKey,Key,UpdPos)
		  end,
		  KeyList).

update_element_do(Tab,Tuple,Key,UpdPos) ->

    %% Strategy: Step around in Values array and call ets:update_element for the values.
    %% Take Length number of steps of size 1, then of size 2, ..., Length-1.
    %% This will try all combinations of {fromValue,toValue}
    %%
    %% IMPORTANT: size(Values) must be a prime number for this to work!!!

    Big32 = 16#12345678,
    Big64 = 16#123456789abcdef0,
    Values = { 623, -27, 0, Big32, -Big32, Big64, -Big64, Big32*Big32,
	       -Big32*Big32, Big32*Big64, -Big32*Big64, Big64*Big64, -Big64*Big64,
	       "A", "Sverker", [], {12,-132}, {},
	       <<45,232,0,12,133>>, <<234,12,23>>, list_to_binary(lists:seq(1,100)),
	       (fun(X) -> X*Big32 end),
	       make_ref(), make_ref(), self(), ok, update_element, 28, 29 },
    Length = size(Values),

    PosValArgF = fun(ToIx, ResList, [Pos | PosTail], Rand, MeF) ->
			 NextIx = (ToIx+Rand) rem Length,
			 MeF(NextIx, [{Pos,element(ToIx+1,Values)} | ResList], PosTail, Rand, MeF);

		    (_ToIx, ResList, [], _Rand, _MeF) ->
			 ResList;

		    (ToIx, [], Pos, _Rand, _MeF) ->
			 {Pos, element(ToIx+1,Values)}   % single {pos,value} arg
		 end,

    UpdateF = fun(ToIx,Rand) ->
                      PosValArg = PosValArgF(ToIx,[],UpdPos,Rand,PosValArgF),
                      %%io:format("update_element(~p)~n",[PosValArg]),
                      ArgHash = erlang:phash2({Tab,Key,PosValArg}),
                      true = ets:update_element(Tab, Key, PosValArg),
                      ArgHash = erlang:phash2({Tab,Key,PosValArg}),
                      NewTuple = update_tuple(PosValArg,Tuple),
                      [NewTuple] = ets:lookup(Tab,Key)
	      end,

    LoopF = fun(_FromIx, Incr, _Times, Checksum, _MeF) when Incr >= Length ->
		    Checksum; % done

	       (FromIx, Incr, 0, Checksum, MeF) ->
		    MeF(FromIx, Incr+1, Length, Checksum, MeF);

	       (FromIx, Incr, Times, Checksum, MeF) ->
		    ToIx = (FromIx + Incr) rem Length,
		    UpdateF(ToIx,Checksum),
		    if
			Incr =:= 0 -> UpdateF(ToIx,Checksum);  % extra update to same value
			true -> true
		    end,
		    MeF(ToIx, Incr, Times-1, Checksum+ToIx+1, MeF)
	    end,

    FirstTuple = Tuple,
    true = ets:insert(Tab,FirstTuple),
    [FirstTuple] = ets:lookup(Tab,Key),

    Checksum = LoopF(0, 1, Length, 0, LoopF),
    Checksum = (Length-1)*Length*(Length+1) div 2,  % if Length is a prime
    ok.

update_tuple({Pos,Val}, Tpl) ->
    setelement(Pos, Tpl, Val);
update_tuple([{Pos,Val} | Tail], Tpl) ->
    update_tuple(Tail,setelement(Pos, Tpl, Val));
update_tuple([], Tpl) ->
    Tpl.



update_element_neg(Opts) ->
    Set = ets_new(set,Opts),
    OrdSet = ets_new(ordered_set,[ordered_set | Opts]),
    update_element_neg_do(Set),
    update_element_neg_do(OrdSet),
    ets:delete(Set),
    {'EXIT',{badarg,_}} = (catch ets:update_element(Set,key,{2,1})),
    ets:delete(OrdSet),
    {'EXIT',{badarg,_}} = (catch ets:update_element(OrdSet,key,{2,1})),

    Bag = ets_new(bag,[bag | Opts]),
    DBag = ets_new(duplicate_bag,[duplicate_bag | Opts]),
    {'EXIT',{badarg,_}} = (catch ets:update_element(Bag,key,{2,1})),
    {'EXIT',{badarg,_}} = (catch ets:update_element(DBag,key,{2,1})),
    true = ets:delete(Bag),
    true = ets:delete(DBag),
    ok.


update_element_neg_do(T) ->
    Object = {key, 0, "Hej"},
    true = ets:insert(T,Object),

    UpdateF = fun(Arg3) ->
		      ArgHash = erlang:phash2({T,key,Arg3}),
		      {'EXIT',{badarg,_}} = (catch ets:update_element(T,key,Arg3)),
		      ArgHash = erlang:phash2({T,key,Arg3}),
		      [Object] = ets:lookup(T,key)
	      end,

    %% List of invalid {Pos,Value} tuples
    InvList = [false, {2}, {2,1,false}, {false,1}, {0,1}, {1,1}, {-1,1}, {4,1}],

    lists:foreach(UpdateF, InvList),
    lists:foreach(fun(InvTpl) -> UpdateF([{2,1},InvTpl]) end, InvList),
    lists:foreach(fun(InvTpl) -> UpdateF([InvTpl,{2,1}]) end, InvList),
    lists:foreach(fun(InvTpl) -> UpdateF([{2,1},{3,"Hello"},InvTpl]) end, InvList),
    lists:foreach(fun(InvTpl) -> UpdateF([{3,"Hello"},{2,1},InvTpl]) end, InvList),
    lists:foreach(fun(InvTpl) -> UpdateF([{2,1},InvTpl,{3,"Hello"}]) end, InvList),
    lists:foreach(fun(InvTpl) -> UpdateF([InvTpl,{3,"Hello"},{2,1}]) end, InvList),
    UpdateF([{2,1} | {3,1}]),
    lists:foreach(fun(InvTpl) -> UpdateF([{2,1} | InvTpl]) end, InvList),

    true = ets:update_element(T,key,[]),
    false = ets:update_element(T,false,[]),
    false = ets:update_element(T,false,{2,1}),
    ets:delete(T,key),
    false = ets:update_element(T,key,{2,1}),
    ok.


%% test various variants of update_counter.
update_counter(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts(fun update_counter_do/1),
    verify_etsmem(EtsMem).

update_counter_do(Opts) ->
    Set = ets_new(set,Opts),
    OrdSet = ets_new(ordered_set,[ordered_set | Opts]),
    update_counter_for(Set),
    update_counter_for(OrdSet),
    ets:delete_all_objects(Set),
    ets:delete_all_objects(OrdSet),
    ets:safe_fixtable(Set, true),
    ets:safe_fixtable(OrdSet, true),
    update_counter_for(Set),
    update_counter_for(OrdSet),
    ets:safe_fixtable(Set, false),
    ets:safe_fixtable(OrdSet, false),
    ets:delete(Set),
    ets:delete(OrdSet),
    update_counter_neg(Opts).

update_counter_for(T) ->
    ets:insert(T,{a,1,1}),
    101 = ets:update_counter(T,a,100),
    [{a,101,1}] = ets:lookup(T,a),
    101 = ets:update_counter(T,a,{3,100}),
    [{a,101,101}] = ets:lookup(T,a),


    LooperF = fun(Obj, 0, _, _) ->
		      Obj;

		 (Obj, Times, Arg3, Myself) ->
		      {NewObj, Ret} = uc_mimic(Obj,Arg3),
		      ArgHash = erlang:phash2({T,a,Arg3}),
		      %%io:format("update_counter(~p, ~p, ~p) expecting ~p\n",[T,a,Arg3,Ret]),
                      [DefaultObj] = ets:lookup(T, a),
		      Ret = ets:update_counter(T,a,Arg3),
                      Ret = ets:update_counter(T, b, Arg3, DefaultObj),   % Use other key
		      ArgHash = erlang:phash2({T,a,Arg3}),
		      %%io:format("NewObj=~p~n ",[NewObj]),
		      [NewObj] = ets:lookup(T,a),
                      true = ets:lookup(T, b) =:= [setelement(1, NewObj, b)],
                      ets:delete(T, b),
		      Myself(NewObj,Times-1,Arg3,Myself)
	      end,

    LoopF = fun(Obj, Times, Arg3) ->
		    %%io:format("Loop start:\nObj = ~p\nArg3=~p\n",[Obj,Arg3]),
		    LooperF(Obj,Times,Arg3,LooperF)
	    end,

    SmallMax32 = (1 bsl 27) - 1,
    SmallMax64 = (1 bsl (27+32)) - 1,
    Big1Max32 = (1 bsl 32) - 1,
    Big1Max64 = (1 bsl 64) - 1,

    Steps = 100,
    Obj0 = {a,0,0,0,0},
    ets:insert(T,Obj0),
    Obj1 = LoopF(Obj0, Steps, {2,(SmallMax32 div Steps)*2}),
    Obj2 = LoopF(Obj1, Steps, {3,(SmallMax64 div Steps)*2}),
    Obj3 = LoopF(Obj2, Steps, {4,(Big1Max32 div Steps)*2}),
    Obj4 = LoopF(Obj3, Steps, {5,(Big1Max64 div Steps)*2}),

    Obj5 = LoopF(Obj4, Steps, {2,-(SmallMax32 div Steps)*4}),
    Obj6 = LoopF(Obj5, Steps, {3,-(SmallMax64 div Steps)*4}),
    Obj7 = LoopF(Obj6, Steps, {4,-(Big1Max32 div Steps)*4}),
    Obj8 = LoopF(Obj7, Steps, {5,-(Big1Max64 div Steps)*4}),

    Obj9 = LoopF(Obj8, Steps, {2,(SmallMax32 div Steps)*2}),
    ObjA = LoopF(Obj9, Steps, {3,(SmallMax64 div Steps)*2}),
    ObjB = LoopF(ObjA, Steps, {4,(Big1Max32 div Steps)*2}),
    Obj0 = LoopF(ObjB, Steps, {5,(Big1Max64 div Steps)*2}),

    %% back at zero, same trip again with lists

    Obj4 = LoopF(Obj0,Steps,[{2, (SmallMax32 div Steps)*2},
			     {3, (SmallMax64 div Steps)*2},
			     {4, (Big1Max32 div Steps)*2},
			     {5, (Big1Max64 div Steps)*2}]),

    Obj8 = LoopF(Obj4,Steps,[{4, -(Big1Max32 div Steps)*4},
			     {2, -(SmallMax32 div Steps)*4},
			     {5, -(Big1Max64 div Steps)*4},
			     {3, -(SmallMax64 div Steps)*4}]),

    Obj0 = LoopF(Obj8,Steps,[{5, (Big1Max64 div Steps)*2},
			     {2, (SmallMax32 div Steps)*2},
			     {4, (Big1Max32 div Steps)*2},
			     {3, (SmallMax64 div Steps)*2}]),

    %% make them shift size at the same time
    ObjC = LoopF(Obj0,Steps,[{5, (Big1Max64 div Steps)*2},
			     {3, (Big1Max64 div Steps)*2 + 1},
			     {2, -(Big1Max64 div Steps)*2},
			     {4, -(Big1Max64 div Steps)*2 + 1}]),

    %% update twice in same list
    ObjD = LoopF(ObjC,Steps,[{5, -(Big1Max64 div Steps) + 1},
			     {3, -(Big1Max64 div Steps)*2 - 1},
			     {5, -(Big1Max64 div Steps) - 1},
			     {4, (Big1Max64 div Steps)*2 - 1}]),

    Obj0 = LoopF(ObjD,Steps,[{2, (Big1Max64 div Steps) - 1},
			     {4, Big1Max64*2},
			     {2, (Big1Max64 div Steps) + 1},
			     {4, -Big1Max64*2}]),

    %% warping with list
    ObjE = LoopF(Obj0,1000,
		 [{3,SmallMax32*4 div 5,SmallMax32*2,-SmallMax32*2},
		  {5,-SmallMax64*4 div 7,-SmallMax64*2,SmallMax64*2},
		  {4,-Big1Max32*4 div 11,-Big1Max32*2,Big1Max32*2},
		  {2,Big1Max64*4 div 13,Big1Max64*2,-Big1Max64*2}]),

    %% warping without list
    ObjF = LoopF(ObjE,1000,{3,SmallMax32*4 div 5,SmallMax32*2,-SmallMax32*2}),
    ObjG = LoopF(ObjF,1000,{5,-SmallMax64*4 div 7,-SmallMax64*2,SmallMax64*2}),
    ObjH = LoopF(ObjG,1000,{4,-Big1Max32*4 div 11,-Big1Max32*2,Big1Max32*2}),
    ObjI = LoopF(ObjH,1000,{2,Big1Max64*4 div 13,Big1Max64*2,-Big1Max64*2}),

    %% mixing it up
    LoopF(ObjI,1000,
	  [{3,SmallMax32*4 div 5,SmallMax32*2,-SmallMax32*2},
	   {5,-SmallMax64*4 div 3},
	   {3,-SmallMax32*4 div 11},
	   {5,0},
	   {4,1},
	   {5,-SmallMax64*4 div 7,-SmallMax64*2,SmallMax64*2},
	   {2,Big1Max64*4 div 13,Big1Max64*2,-Big1Max64*2}]),
    ok.

%% uc_mimic works kind of like the real ets:update_counter
%% Obj = Tuple in ets
%% Pits = {Pos,Incr} | {Pos,Incr,Thres,Warp}
%% Returns {Updated tuple in ets, Return value from update_counter}
uc_mimic(Obj, Pits) when is_tuple(Pits) ->
    Pos = element(1,Pits),
    NewObj = setelement(Pos, Obj, uc_adder(element(Pos,Obj),Pits)),
    {NewObj, element(Pos,NewObj)};

uc_mimic(Obj, PitsList) when is_list(PitsList) ->
    {NewObj,ValList} = uc_mimic(Obj,PitsList,[]),
    {NewObj,lists:reverse(ValList)}.

uc_mimic(Obj, [], Acc) ->
    {Obj,Acc};
uc_mimic(Obj, [Pits|Tail], Acc) ->
    {NewObj,NewVal} = uc_mimic(Obj,Pits),
    uc_mimic(NewObj,Tail,[NewVal|Acc]).

uc_adder(Init, {_Pos, Add}) ->
    Init + Add;
uc_adder(Init, {_Pos, Add, Thres, Warp}) ->
    case Init + Add of
	X when X > Thres, Add > 0 ->
	    Warp;
	Y when Y < Thres, Add < 0 ->
	    Warp;
	Z ->
	    Z
    end.

update_counter_neg(Opts) ->
    Set = ets_new(set,Opts),
    OrdSet = ets_new(ordered_set,[ordered_set | Opts]),
    update_counter_neg_for(Set),
    update_counter_neg_for(OrdSet),
    ets:delete(Set),
    {'EXIT',{badarg,_}} = (catch ets:update_counter(Set,key,1)),
    ets:delete(OrdSet),
    {'EXIT',{badarg,_}} = (catch ets:update_counter(OrdSet,key,1)),

    Bag = ets_new(bag,[bag | Opts]),
    DBag = ets_new(duplicate_bag,[duplicate_bag | Opts]),
    {'EXIT',{badarg,_}} = (catch ets:update_counter(Bag,key,1)),
    {'EXIT',{badarg,_}} = (catch ets:update_counter(DBag,key,1)),
    true = ets:delete(Bag),
    true = ets:delete(DBag),
    ok.

update_counter_neg_for(T) ->
    Object = {key,0,false,1},
    true = ets:insert(T,Object),

    UpdateF = fun(Arg3) ->
		      ArgHash = erlang:phash2({T,key,Arg3}),
		      {'EXIT',{badarg,_}} = (catch ets:update_counter(T,key,Arg3)),
		      ArgHash = erlang:phash2({T,key,Arg3}),
		      [Object] = ets:lookup(T,key)
	      end,

    %% List of invalid arg3-tuples
    InvList = [false, {2}, {2,false}, {false,1},
	       {0,1}, {-1,1}, % BUG < R12B-2
	       {1,1}, {3,1}, {5,1}, {2,1,100}, {2,1,100,0,false}, {2,1,false,0}, {2,1,0,false}],

    lists:foreach(UpdateF, InvList),
    lists:foreach(fun(Inv) -> UpdateF([{2,1},Inv]) end, InvList),
    lists:foreach(fun(Inv) -> UpdateF([Inv,{2,1}]) end, InvList),
    lists:foreach(fun(Inv) -> UpdateF([{2,1},{4,-100},Inv]) end, InvList),
    lists:foreach(fun(Inv) -> UpdateF([{4,100,50,0},{2,1},Inv]) end, InvList),
    lists:foreach(fun(Inv) -> UpdateF([{2,1},Inv,{4,100,50,0}]) end, InvList),
    lists:foreach(fun(Inv) -> UpdateF([Inv,{4,100,50,0},{2,1}]) end, InvList),
    UpdateF([{2,1} | {4,1}]),
    lists:foreach(fun(Inv) -> UpdateF([{2,1} | Inv]) end, InvList),

    {'EXIT',{badarg,_}} = (catch ets:update_counter(T,false,1)),
    ets:delete(T,key),
    {'EXIT',{badarg,_}} = (catch ets:update_counter(T,key,1)),
    ok.


evil_update_counter(Config) when is_list(Config) ->
    %% The code server uses ets table. Pre-load modules that might not be
    %% already loaded.
    gb_sets:module_info(),
    math:module_info(),
    ordsets:module_info(),
    rand:module_info(),

    repeat_for_opts(fun evil_update_counter_do/1).

evil_update_counter_do(Opts) ->
    EtsMem = etsmem(),
    process_flag(trap_exit, true),
    Pids = [my_spawn_link(fun() -> evil_counter(I,Opts) end)  || I <- lists:seq(1, 40)],
    wait_for_all(gb_sets:from_list(Pids)),
    verify_etsmem(EtsMem),
    ok.

wait_for_all(Pids0) ->
    case gb_sets:is_empty(Pids0) of
	true ->
	    ok;
	false ->
	    receive
		{'EXIT',Pid,normal} ->
		    Pids = gb_sets:delete(Pid, Pids0),
		    wait_for_all(Pids);
		Other ->
		    io:format("unexpected: ~p\n", [Other]),
		    ct:fail(failed)
	    end
    end.

evil_counter(I,Opts) ->
    T = ets_new(a, Opts),
    Start0 = case I rem 3 of
		 0 -> 16#12345678;
		 1 -> 16#12345678FFFFFFFF;
		 2 -> 16#7777777777FFFFFFFF863648726743
	     end,
    Start = Start0 + rand:uniform(100000),
    ets:insert(T, {dracula,Start}),
    Iter = 40000 div syrup_factor(),
    End = Start + Iter,
    End = evil_counter_1(Iter, T),
    ets:delete(T).

evil_counter_1(0, T) ->
    [{dracula,Count}] = ets:lookup(T, dracula),
    Count;
evil_counter_1(Iter, T) ->
    ets:update_counter(T, dracula, 1),
    evil_counter_1(Iter-1, T).

update_counter_with_default(Config) when is_list(Config) ->
    repeat_for_opts(fun update_counter_with_default_do/1).

update_counter_with_default_do(Opts) ->
    T1 = ets_new(a, [set | Opts]),
    %% Insert default object.
    3 = ets:update_counter(T1, foo, 2, {beaufort,1}),
    1 = ets:info(T1, size),
    %% Increment.
    5 = ets:update_counter(T1, foo, 2, {cabecou,1}),
    1 = ets:info(T1, size),
    %% Increment with list.
    [9] = ets:update_counter(T1, foo, [{2,4}], {camembert,1}),
    1 = ets:info(T1, size),
    %% Same with non-immediate key.
    3 = ets:update_counter(T1, {foo,bar}, 2, {{chaource,chevrotin},1}),
    2 = ets:info(T1, size),
    5 = ets:update_counter(T1, {foo,bar}, 2, {{cantal,comté},1}),
    2 = ets:info(T1, size),
    [9] = ets:update_counter(T1, {foo,bar}, [{2,4}], {{emmental,de,savoie},1}),
    2 = ets:info(T1, size),
    %% default counter is not an integer.
    {'EXIT',{badarg,_}} = (catch ets:update_counter(T1, qux, 3, {saint,félicien})),
    2 = ets:info(T1, size),
    %% No third element in default value.
    {'EXIT',{badarg,_}} = (catch ets:update_counter(T1, qux, [{3,1}], {roquefort,1})),
    2 = ets:info(T1, size),

    %% Same with ordered set.
    T2 = ets_new(b, [ordered_set | Opts]),
    3 = ets:update_counter(T2, foo, 2, {maroilles,1}),
    1 = ets:info(T2, size),
    5 = ets:update_counter(T2, foo, 2, {mimolette,1}),
    1 = ets:info(T2, size),
    [9] = ets:update_counter(T2, foo, [{2,4}], {morbier,1}),
    1 = ets:info(T2, size),
    3 = ets:update_counter(T2, {foo,bar}, 2, {{laguiole},1}),
    2 = ets:info(T2, size),
    5 = ets:update_counter(T2, {foo,bar}, 2, {{saint,nectaire},1}),
    2 = ets:info(T2, size),
    [9] = ets:update_counter(T2, {foo,bar}, [{2,4}], {{rocamadour},1}),
    2 = ets:info(T2, size),
    %% Arithmetically-equal keys.
    3 = ets:update_counter(T2, 1.0, 2, {1,1}),
    3 = ets:info(T2, size),
    5 = ets:update_counter(T2, 1, 2, {1,1}),
    3 = ets:info(T2, size),
    7 = ets:update_counter(T2, 1, 2, {1.0,1}),
    3 = ets:info(T2, size),
    %% Same with reversed type difference.
    3 = ets:update_counter(T2, 2, 2, {2.0,1}),
    4 = ets:info(T2, size),
    5 = ets:update_counter(T2, 2.0, 2, {2.0,1}),
    4 = ets:info(T2, size),
    7 = ets:update_counter(T2, 2.0, 2, {2,1}),
    4 = ets:info(T2, size),
    %% default counter is not an integer.
    {'EXIT',{badarg,_}} = (catch ets:update_counter(T1, qux, 3, {saint,félicien})),
    4 = ets:info(T2, size),
    %% No third element in default value.
    {'EXIT',{badarg,_}} = (catch ets:update_counter(T1, qux, [{3,1}], {roquefort,1})),
    4 = ets:info(T2, size),
    ok.

%% ERL-1125
update_counter_with_default_bad_pos(Config) when is_list(Config) ->
    repeat_for_all_ord_set_table_types(fun update_counter_with_default_bad_pos_do/1).

update_counter_with_default_bad_pos_do(Opts) ->
    T = ets_new(a, Opts),
    0 = ets:info(T, size),
    ok = try ets:update_counter(T, 101065, {1, 1}, {101065, 0})
         catch
             error:badarg -> ok;
             Class:Reason -> {Class, Reason}
         end,
    0 = ets:info(T, size),
    ok.

update_counter_table_growth(_Config) ->
    repeat_for_opts(fun update_counter_table_growth_do/1).

update_counter_table_growth_do(Opts) ->
    Set = ets_new(b, [set | Opts]),
    [ets:update_counter(Set, N, {2, 1}, {N, 1}) || N <- lists:seq(1,10000)],
    OrderedSet = ets_new(b, [ordered_set | Opts]),
    [ets:update_counter(OrderedSet, N, {2, 1}, {N, 1}) || N <- lists:seq(1,10000)],
    ok.

%% Check that a first-next sequence always works on a fixed table.
fixtable_next(Config) when is_list(Config) ->
    repeat_for_opts(fun fixtable_next_do/1,
                    [write_concurrency,all_types]).

fixtable_next_do(Opts) ->
    EtsMem = etsmem(),
    do_fixtable_next(ets_new(set,[public | Opts])),
    verify_etsmem(EtsMem).

do_fixtable_next(Tab) ->
    F = fun(X,T,FF) ->
                case X of
                    0 -> true;
                    _ ->
                        ets:insert(T, {X,
                                       integer_to_list(X),
                                       X rem 10}),
                        FF(X-1,T,FF)
                end
        end,
    F(100,Tab,F),
    ets:safe_fixtable(Tab,true),
    First = ets:first(Tab),
    ets:delete(Tab, First),
    ets:next(Tab, First),
    ets:match_delete(Tab,{'_','_','_'}),
    '$end_of_table' = ets:next(Tab, First),
    true = ets:info(Tab, fixed),
    ets:safe_fixtable(Tab, false),
    false = ets:info(Tab, fixed),
    ets:delete(Tab).

%% Check that iteration of bags find all live objects and nothing else.
fixtable_iter_bag(Config) when is_list(Config) ->
    repeat_for_opts(fun fixtable_iter_do/1,
                    [write_concurrency,[bag,duplicate_bag]]).

fixtable_iter_do(Opts) ->
    EtsMem = etsmem(),
    do_fixtable_iter_bag(ets_new(fixtable_iter_bag,Opts)),
    verify_etsmem(EtsMem).

do_fixtable_iter_bag(T) ->
    MaxValues = 4,
    %% Create 1 to MaxValues objects for each key
    %% and then delete every possible combination of those objects
    %% in every possible order.
    %% Then test iteration returns all live objects and nothing else.

    CrDelOps = [begin
                    Values = lists:seq(1,N),
                    %% All ways of deleting any number of the Values in any order
                    Combos = combs(Values),
                    DeleteOps = concat_lists([perms(C) || C <- Combos]),
                    {N, DeleteOps}
                end
                || N <- lists:seq(1,MaxValues)],

    %%io:format("~p\n", [CrDelOps]),

    NKeys = lists:foldl(fun({_, DeleteOps}, Cnt) ->
                               Cnt + length(DeleteOps)
                       end,
                       0,
                       CrDelOps),

    io:format("Create ~p keys\n", [NKeys]),

    %% Fixate even before inserts just to maintain small table size
    %% and increase likelyhood of different keys in same bucket.
    ets:safe_fixtable(T,true),
    InsRes = [begin
                  [begin
                       Key = {NValues,ValueList},
                       [begin
                            Tpl = {Key, V},
                            %%io:format("Insert object ~p", [Tpl]),
                            ets:insert(T, Tpl),
                            Tpl
                        end
                        || V <- lists:seq(1,NValues)]
                   end
                   || ValueList <- DeleteOps]
              end
              || {NValues, DeleteOps} <- CrDelOps],

    Inserted = lists:flatten(InsRes),
    InSorted = lists:sort(Inserted),
    InSorted = lists:usort(Inserted),  %% No duplicates
    NObjs = length(Inserted),

    DelRes = [begin
                  [begin
                       Key = {NValues,ValueList},
                       [begin
                            Tpl = {Key, V},
                            %%io:format("Delete object ~p", [Tpl]),
                            ets:delete_object(T, Tpl),
                            Tpl
                        end
                        || V <- ValueList]
                   end
                   || ValueList <- DeleteOps]
              end
              || {NValues, DeleteOps} <- CrDelOps],

    Deleted = lists:flatten(DelRes),
    DelSorted = lists:sort(Deleted),
    DelSorted = lists:usort(Deleted),  %% No duplicates
    NDels = length(Deleted),
    
    %% Nr of keys where all values were deleted.
    NDeletedKeys = lists:sum([factorial(N) || N <- lists:seq(1,MaxValues)]),

    CountKeysFun = fun Me(K1, Cnt) ->
                           case ets:next(T, K1) of
                               '$end_of_table' ->
                                   Cnt;
                               K2 ->
                                   Objs = ets:lookup(T, K2),
                                   [{{NValues, ValueList}, _V} | _] = Objs,
                                   ExpectedLive = NValues - length(ValueList),
                                   ExpectedLive = length(Objs),
                                   Me(K2, Cnt+1)
                           end
                   end,

    ExpectedKeys = NKeys - NDeletedKeys,
    io:format("Expected keys: ~p\n", [ExpectedKeys]),
    FoundKeys = CountKeysFun(ets:first(T), 1),
    io:format("Found keys: ~p\n", [FoundKeys]),
    ExpectedKeys = FoundKeys,

    ExpectedObjs = NObjs - NDels,
    io:format("Expected objects: ~p\n", [ExpectedObjs]),
    FoundObjs = ets:select_count(T, [{{'_','_'}, [], [true]}]),
    io:format("Found objects: ~p\n", [FoundObjs]),
    ExpectedObjs = FoundObjs,

    ets:delete(T).

%% All permutations of list
perms([]) -> [[]];
perms(L)  -> [[H|T] || H <- L, T <- perms(L--[H])].

%% All combinations of picking the element (or not) from list
combs([]) -> [[]];
combs([H|T]) ->
    Tcombs = combs(T),
    Tcombs ++ [[H | C] || C <- Tcombs].

factorial(0) -> 1;
factorial(N) when N > 0 ->
    N * factorial(N - 1).

concat_lists([]) ->
    [];
concat_lists([H|T]) ->
    H ++ concat_lists(T).


%% Check inserts of deleted keys in fixed bags.
fixtable_insert(Config) when is_list(Config) ->
    Combos = [[Type,{write_concurrency,WC}] || Type<- [bag,duplicate_bag],
					       WC <- [false,true]],
    lists:foreach(fun(Opts) -> fixtable_insert_do(Opts) end,
		  Combos),
    ok.

fixtable_insert_do(Opts) ->
    io:format("Opts = ~p\n",[Opts]),
    Ets = make_table(ets, Opts, [{a,1}, {a,2}, {b,1}, {b,2}]),
    ets:safe_fixtable(Ets,true),
    ets:match_delete(Ets,{b,1}),
    First = ets:first(Ets),
    Next = case First of
	       a -> b;
	       b -> a
	   end,
    Next = ets:next(Ets,First),
    ets:delete(Ets,Next),
    '$end_of_table' = ets:next(Ets,First),
    ets:insert(Ets, {Next,1}),
    false = ets:insert_new(Ets, {Next,1}),
    Next = ets:next(Ets,First),
    '$end_of_table' = ets:next(Ets,Next),
    ets:delete(Ets,Next),
    '$end_of_table' = ets:next(Ets,First),
    ets:insert(Ets, {Next,2}),
    false = ets:insert_new(Ets, {Next,1}),
    Next = ets:next(Ets,First),
    '$end_of_table' = ets:next(Ets,Next),
    ets:delete(Ets,First),
    Next = ets:first(Ets),
    '$end_of_table' = ets:next(Ets,Next),
    ets:delete(Ets,Next),
    '$end_of_table' = ets:next(Ets,First),
    true = ets:insert_new(Ets,{Next,1}),
    false = ets:insert_new(Ets,{Next,2}),
    Next = ets:next(Ets,First),
    ets:delete_object(Ets,{Next,1}),
    '$end_of_table' = ets:next(Ets,First),
    true = ets:insert_new(Ets,{Next,2}),
    false = ets:insert_new(Ets,{Next,1}),
    Next = ets:next(Ets,First),
    ets:delete(Ets,First),
    ets:safe_fixtable(Ets,false),
    {'EXIT',{badarg,_}} = (catch ets:next(Ets,First)),
    ok.

%% Test the 'write_concurrency' option.
write_concurrency(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    Yes1 = ets_new(foo,[public,{write_concurrency,true}]),
    Yes2 = ets_new(foo,[protected,{write_concurrency,true}]),
    No1 = ets_new(foo,[private,{write_concurrency,true}]),

    Yes3 = ets_new(foo,[bag,public,{write_concurrency,true}]),
    Yes4 = ets_new(foo,[bag,protected,{write_concurrency,true}]),
    No2 = ets_new(foo,[bag,private,{write_concurrency,true}]),

    Yes5 = ets_new(foo,[duplicate_bag,public,{write_concurrency,true}]),
    Yes6 = ets_new(foo,[duplicate_bag,protected,{write_concurrency,true}]),
    No3 = ets_new(foo,[duplicate_bag,private,{write_concurrency,true}]),

    NoCentCtrs = {decentralized_counters,false},
    Yes7 = ets_new(foo,[ordered_set,public,{write_concurrency,true},NoCentCtrs]),
    Yes8 = ets_new(foo,[ordered_set,protected,{write_concurrency,true},NoCentCtrs]),
    Yes9 = ets_new(foo,[ordered_set,{write_concurrency,true},NoCentCtrs]),
    Yes10 = ets_new(foo,[{write_concurrency,true},ordered_set,public,NoCentCtrs]),
    Yes11 = ets_new(foo,[{write_concurrency,true},ordered_set,protected,NoCentCtrs]),
    Yes12 = ets_new(foo,[set,{write_concurrency,false},
                         {write_concurrency,true},ordered_set,public,NoCentCtrs]),
    Yes13 = ets_new(foo,[private,public,set,{write_concurrency,false},
                         {write_concurrency,true},ordered_set,NoCentCtrs]),
    Yes14 = ets_new(foo,[ordered_set,public,{write_concurrency,true}]),
    No4 = ets_new(foo,[ordered_set,private,{write_concurrency,true}]),
    No5 = ets_new(foo,[ordered_set,public,{write_concurrency,false}]),
    No6 = ets_new(foo,[ordered_set,protected,{write_concurrency,false}]),
    No7 = ets_new(foo,[ordered_set,private,{write_concurrency,false}]),

    No8 = ets_new(foo,[public,{write_concurrency,false}]),
    No9 = ets_new(foo,[protected,{write_concurrency,false}]),

    YesMem = ets:info(Yes1,memory),
    NoHashMem = ets:info(No1,memory),
    YesTreeMem = ets:info(Yes7,memory),
    YesYesTreeMem = ets:info(Yes14,memory),
    NoTreeMem = ets:info(No4,memory),
    io:format("YesMem=~p NoHashMem=~p NoTreeMem=~p YesTreeMem=~p\n",[YesMem,NoHashMem,
                                                                     NoTreeMem,YesTreeMem]),

    YesMem = ets:info(Yes2,memory),
    YesMem = ets:info(Yes3,memory),
    YesMem = ets:info(Yes4,memory),
    YesMem = ets:info(Yes5,memory),
    YesMem = ets:info(Yes6,memory),
    NoHashMem = ets:info(No2,memory),
    NoHashMem = ets:info(No3,memory),
    YesTreeMem = ets:info(Yes7,memory),
    YesTreeMem = ets:info(Yes8,memory),
    YesTreeMem = ets:info(Yes9,memory),
    YesTreeMem = ets:info(Yes10,memory),
    YesTreeMem = ets:info(Yes11,memory),
    YesTreeMem = ets:info(Yes12,memory),
    YesTreeMem = ets:info(Yes13,memory),
    NoTreeMem = ets:info(No4,memory),
    NoTreeMem = ets:info(No5,memory),
    NoTreeMem = ets:info(No6,memory),
    NoTreeMem = ets:info(No7,memory),
    NoHashMem = ets:info(No8,memory),
    NoHashMem = ets:info(No9,memory),

    true = YesMem > YesTreeMem,

    case erlang:system_info(schedulers) > 1 of
        true ->
            true = YesMem > NoHashMem,
            true = YesMem > NoTreeMem,
            true = YesTreeMem < NoTreeMem,
            true = YesYesTreeMem > YesTreeMem;
        _ ->
            one_scheduler_only
    end,

    {'EXIT',{badarg,_}} = (catch ets_new(foo,[public,{write_concurrency,foo}])),
    {'EXIT',{badarg,_}} = (catch ets_new(foo,[public,{write_concurrency}])),
    {'EXIT',{badarg,_}} = (catch ets_new(foo,[public,{write_concurrency,true,foo}])),
    {'EXIT',{badarg,_}} = (catch ets_new(foo,[public,write_concurrency])),

    lists:foreach(fun(T) -> ets:delete(T) end,
        	  [Yes1,Yes2,Yes3,Yes4,Yes5,Yes6,Yes7,Yes8,Yes9,Yes10,Yes11,Yes12,Yes13,Yes14,
        	   No1,No2,No3,No4,No5,No6,No7,No8,No9]),
    verify_etsmem(EtsMem),
    ok.


%% The 'heir' option.
heir(Config) when is_list(Config) ->
    repeat_for_opts(fun heir_do/1).

heir_do(Opts) ->
    EtsMem = etsmem(),
    Master = self(),

    %% Different types of heir data and link/monitor relations
    TestFun = fun(Arg) -> {EtsMem,Arg} end,
    Combos = [{Data,Mode} || Data<-[foo_data, <<"binary">>,
				    lists:seq(1,10), {17,TestFun,self()},
				    "The busy heir"],
			     Mode<-[none,link,monitor]],
    lists:foreach(fun({Data,Mode})-> heir_1(Data,Mode,Opts) end,
		  Combos),

    %% No heir
    {Founder1,MrefF1} = my_spawn_monitor(fun()->heir_founder(Master,foo_data,Opts)end),
    Founder1 ! {go, none},
    {"No heir",Founder1} = receive_any(),
    {'DOWN', MrefF1, process, Founder1, normal} = receive_any(),
    undefined = ets:info(foo),

    %% An already dead heir
    {Heir2,MrefH2} = my_spawn_monitor(fun()->die end),
    {'DOWN', MrefH2, process, Heir2, normal} = receive_any(),
    {Founder2,MrefF2} = my_spawn_monitor(fun()->heir_founder(Master,foo_data,Opts)end),
    Founder2 ! {go, Heir2},
    {"No heir",Founder2} = receive_any(),
    {'DOWN', MrefF2, process, Founder2, normal} = receive_any(),
    undefined = ets:info(foo),

    %% When heir dies before founder
    {Founder3,MrefF3} = my_spawn_monitor(fun()->heir_founder(Master,"The dying heir",Opts)end),
    {Heir3,MrefH3} = my_spawn_monitor(fun()->heir_heir(Founder3)end),
    Founder3 ! {go, Heir3},
    {'DOWN', MrefH3, process, Heir3, normal} = receive_any(),
    Founder3 ! die_please,
    {'DOWN', MrefF3, process, Founder3, normal} = receive_any(),
    undefined = ets:info(foo),

    %% When heir dies and pid reused before founder dies
    repeat_while(fun() ->
			 NextPidIx = erts_debug:get_internal_state(next_pid),
			 {Founder4,MrefF4} = my_spawn_monitor(fun()->heir_founder(Master,"The dying heir",Opts)end),
			 {Heir4,MrefH4} = my_spawn_monitor(fun()->heir_heir(Founder4)end),
			 Founder4 ! {go, Heir4},
			 {'DOWN', MrefH4, process, Heir4, normal} = receive_any(),
			 erts_debug:set_internal_state(next_pid, NextPidIx),
			 DoppelGanger = spawn_monitor_with_pid(Heir4,
							       fun()-> die_please = receive_any() end),
			 Founder4 ! die_please,
			 {'DOWN', MrefF4, process, Founder4, normal} = receive_any(),
			 case DoppelGanger of
			     {Heir4,MrefH4_B} ->
				 Heir4 ! die_please,
				 {'DOWN', MrefH4_B, process, Heir4, normal} = receive_any(),
				 undefined = ets:info(foo),
				 false;
			     failed ->
				 io:format("Failed to spawn process with pid ~p\n", [Heir4]),
				 true % try again
			 end
		 end),

    verify_etsmem(EtsMem).

heir_founder(Master, HeirData, Opts) ->
    {go,Heir} = receive_any(),
    HeirTpl = case Heir of
		  none -> {heir,none};
		  _ -> {heir, Heir, HeirData}
	      end,
    T = ets_new(foo,[named_table, private, HeirTpl | Opts]),
    true = ets:insert(T,{key,1}),
    [{key,1}] = ets:lookup(T,key),
    Self = self(),
    Self = ets:info(T,owner),
    case ets:info(T,heir) of
	none ->
	    true = (Heir =:= none) orelse (not is_process_alive(Heir)),
	    Master ! {"No heir",self()};

	Heir ->
	    true = is_process_alive(Heir),
	    Heir ! {table,T,HeirData},
	    die_please = receive_any()
    end.


heir_heir(Founder) ->
    heir_heir(Founder, none).
heir_heir(Founder, Mode) ->
    {table,T,HeirData} = receive_any(),
    {'EXIT',{badarg,_}} = (catch ets:lookup(T,key)),
    case HeirData of
	"The dying heir" -> exit(normal);
	_ -> ok
    end,

    Mref = case Mode of
	       link -> process_flag(trap_exit, true),
		       link(Founder);
	       monitor -> erlang:monitor(process,Founder);
	       none -> ok
	   end,
    Founder ! die_please,
    Msg = case HeirData of
	      "The busy heir" -> receive_any_spinning();
	      _ -> receive_any()
	  end,
    {'ETS-TRANSFER', T, Founder, HeirData} = Msg,
    foo = T,
    Self = self(),
    Self = ets:info(T,owner),
    Self = ets:info(T,heir),
    [{key,1}] = ets:lookup(T,key),
    true = ets:insert(T,{key,2}),
    [{key,2}] = ets:lookup(T,key),
    case Mode of % Verify that EXIT or DOWN comes after ETS-TRANSFER
	link ->
	    {'EXIT',Founder,normal} = receive_any(),
	    process_flag(trap_exit, false);
	monitor ->
	    {'DOWN', Mref, process, Founder, normal} = receive_any();
	none -> ok
    end.


heir_1(HeirData,Mode,Opts) ->
    io:format("test with heir_data = ~p\n", [HeirData]),
    Master = self(),
    Founder = my_spawn_link(fun() -> heir_founder(Master,HeirData,Opts) end),
    io:format("founder spawned = ~p\n", [Founder]),
    {Heir,Mref} = my_spawn_monitor(fun() -> heir_heir(Founder,Mode) end),
    io:format("heir spawned = ~p\n", [{Heir,Mref}]),
    Founder ! {go, Heir},
    {'DOWN', Mref, process, Heir, normal} = receive_any().

%% Test ets:give_way/3.
give_away(Config) when is_list(Config) ->
    repeat_for_opts(fun give_away_do/1).

give_away_do(Opts) ->
    T = ets_new(foo,[named_table, private | Opts]),
    true = ets:insert(T,{key,1}),
    [{key,1}] = ets:lookup(T,key),
    Parent = self(),

    %% Give and then give back
    {Receiver,Mref} = my_spawn_monitor(fun()-> give_away_receiver(T,Parent) end),
    give_me = receive_any(),
    true = ets:give_away(T,Receiver,here_you_are),
    {'EXIT',{badarg,_}} = (catch ets:lookup(T,key)),
    Receiver ! give_back,
    {'ETS-TRANSFER',T,Receiver,"Tillbakakaka"} = receive_any(),
    [{key,2}] = ets:lookup(T,key),
    {'DOWN', Mref, process, Receiver, normal} = receive_any(),

    %% Give and then let receiver keep it
    true = ets:insert(T,{key,1}),
    {Receiver3,Mref3} = my_spawn_monitor(fun()-> give_away_receiver(T,Parent) end),
    give_me = receive_any(),
    true = ets:give_away(T,Receiver3,here_you_are),
    {'EXIT',{badarg,_}} = (catch ets:lookup(T,key)),
    Receiver3 ! die_please,
    {'DOWN', Mref3, process, Receiver3, normal} = receive_any(),
    undefined = ets:info(T),

    %% Give and then kill receiver to get back
    T2 = ets_new(foo,[private | Opts]),
    true = ets:insert(T2,{key,1}),
    ets:setopts(T2,{heir,self(),"Som en gummiboll..."}),
    {Receiver2,Mref2} = my_spawn_monitor(fun()-> give_away_receiver(T2,Parent) end),
    give_me = receive_any(),
    true = ets:give_away(T2,Receiver2,here_you_are),
    {'EXIT',{badarg,_}} = (catch ets:lookup(T2,key)),
    Receiver2 ! die_please,
    {'ETS-TRANSFER',T2,Receiver2,"Som en gummiboll..."} = receive_any(),
    [{key,2}] = ets:lookup(T2,key),
    {'DOWN', Mref2, process, Receiver2, normal} = receive_any(),

    %% Some negative testing
    {'EXIT',{badarg,_}} = (catch ets:give_away(T2,Receiver,"To a dead one")),
    {'EXIT',{badarg,_}} = (catch ets:give_away(T2,self(),"To myself")),
    {'EXIT',{badarg,_}} = (catch ets:give_away(T2,"not a pid","To wrong type")),

    true = ets:delete(T2),
    {ReceiverNeg,MrefNeg} = my_spawn_monitor(fun()-> give_away_receiver(T2,Parent) end),
    give_me = receive_any(),
    {'EXIT',{badarg,_}} = (catch ets:give_away(T2,ReceiverNeg,"A deleted table")),

    T3 = ets_new(foo,[public | Opts]),
    my_spawn_link(fun()-> {'EXIT',{badarg,_}} = (catch ets:give_away(T3,ReceiverNeg,"From non owner")),
			  Parent ! done
		  end),
    done = receive_any(),
    ReceiverNeg ! no_soup_for_you,
    {'DOWN', MrefNeg, process, ReceiverNeg, normal} = receive_any(),
    ok.

give_away_receiver(T, Giver) ->
    {'EXIT',{badarg,_}} = (catch ets:lookup(T,key)),
    Giver ! give_me,
    case receive_any() of
	{'ETS-TRANSFER',T,Giver,here_you_are} ->
	    [{key,1}] = ets:lookup(T,key),
	    true = ets:insert(T,{key,2}),
	    case receive_any() of
		give_back ->
		    true = ets:give_away(T,Giver,"Tillbakakaka"),
		    {'EXIT',{badarg,_}} = (catch ets:lookup(T,key));
		die_please ->
		    ok
	    end;
	no_soup_for_you ->
	    ok
    end.


%% Test ets:setopts/2.
setopts(Config) when is_list(Config) ->
    repeat_for_opts(fun setopts_do/1, [write_concurrency,all_types]).

setopts_do(Opts) ->
    Self = self(),
    T = ets_new(foo,[named_table, private | Opts]),
    none = ets:info(T,heir),
    Heir = my_spawn_link(fun()->heir_heir(Self) end),
    ets:setopts(T,{heir,Heir,"Data"}),
    Heir = ets:info(T,heir),
    ets:setopts(T,{heir,self(),"Data"}),
    Self = ets:info(T,heir),
    ets:setopts(T,[{heir,Heir,"Data"}]),
    Heir = ets:info(T,heir),
    ets:setopts(T,[{heir,none}]),
    none = ets:info(T,heir),

    {'EXIT',{badarg,_}} = (catch ets:setopts(T,[{heir,self(),"Data"},false])),
    {'EXIT',{badarg,_}} = (catch ets:setopts(T,{heir,self()})),
    {'EXIT',{badarg,_}} = (catch ets:setopts(T,{heir,false})),
    {'EXIT',{badarg,_}} = (catch ets:setopts(T,heir)),
    {'EXIT',{badarg,_}} = (catch ets:setopts(T,{heir,false,"Data"})),
    {'EXIT',{badarg,_}} = (catch ets:setopts(T,{false,self(),"Data"})),

    ets:setopts(T,{protection,protected}),
    ets:setopts(T,{protection,public}),
    ets:setopts(T,{protection,private}),
    ets:setopts(T,[{protection,protected}]),
    ets:setopts(T,[{protection,public}]),
    ets:setopts(T,[{protection,private}]),

    {'EXIT',{badarg,_}} = (catch ets:setopts(T,{protection})),
    {'EXIT',{badarg,_}} = (catch ets:setopts(T,{protection,false})),
    {'EXIT',{badarg,_}} = (catch ets:setopts(T,{protection,private,false})),
    {'EXIT',{badarg,_}} = (catch ets:setopts(T,protection)),
    ets:delete(T),
    unlink(Heir),
    exit(Heir, bang),
    ok.

%% All kinds of operations with bad table argument.
bad_table(Config) when is_list(Config) ->

    %% Open and close disk_log to stabilize etsmem.
    Name = make_ref(),
    File = filename:join([proplists:get_value(priv_dir, Config),"bad_table.dummy"]),
    {ok, Name} = disk_log:open([{name, Name}, {file, File}]),
    disk_log:close(Name),
    file:delete(File),

    EtsMem = etsmem(),

    repeat_for_opts(fun(Opts) -> bad_table_do(Opts,File) end,
		    [write_concurrency, all_types]),
    verify_etsmem(EtsMem),
    ok.

bad_table_do(Opts, DummyFile) ->
    Parent = self(),
    {Pid,Mref} = my_spawn_opt(fun()-> ets_new(priv,[private,named_table | Opts]),
				      Priv = ets_new(priv,[private | Opts]),
				      ets_new(prot,[protected,named_table | Opts]),
				      Prot = ets_new(prot,[protected | Opts]),
				      Parent ! {self(),Priv,Prot},
				      die_please = receive_any()
			      end,
			      [link, monitor]),
    {Pid,Priv,Prot} = receive_any(),
    MatchSpec = {{key,'_'}, [], ['$$']},
    Fun = fun(X,_) -> X end,
    OpList = [{delete,[key],update},
	      {delete_all_objects,[],update},
	      {delete_object,[{key,data}],update},
	      {first,[],read},
	      {foldl,[Fun, 0], read, tabarg_last},
	      {foldr,[Fun, 0], read, tabarg_last},
	      %%{from_dets,[DetsTab], update},
	      {give_away,[Pid, data], update},
	      %%{info, [], read},
	      %%{info, [safe_fixed], read},
	      %%{init_table,[Name, InitFun],update},
	      {insert, [{key,data}], update},
	      {insert_new, [{key,data}], update},
	      {insert_new, [[{key,data},{other,data}]], update},
	      {last, [], read},
	      {lookup, [key], read},
	      {lookup_element, [key, 2], read},
	      {match, [{}], read},
	      {match, [{},17], read},
	      {match_delete, [{}], update},
	      {match_object, [{}], read},
	      {match_object, [{},17], read},
	      {member,[key], read},
	      {next, [key], read},
	      {prev, [key], read},
	      {rename, [new_name], update},
	      {safe_fixtable, [true], read},
	      {select,[MatchSpec], read},
	      {select,[MatchSpec,17], read},
	      {select_count,[MatchSpec], read},
	      {select_delete,[MatchSpec], update},
	      {setopts, [{heir,none}], update},
	      {slot, [0], read},
	      {tab2file, [DummyFile], read, {return,{error,badtab}}},
	      {tab2file, [DummyFile,[]], read, {return,{error,badtab}}},
	      {tab2list, [], read},
	      %%{table,[], read},
	      %%{to_dets, [DetsTab], read},
	      {update_counter,[key,1], update},
	      {update_element,[key,{2,new_data}], update}
	     ],
    Info = {Opts, Priv, Prot},
    lists:foreach(fun(Op) -> bad_table_op(Info, Op) end,
                  OpList),
    Pid ! die_please,
    {'DOWN', Mref, process, Pid, normal} = receive_any(),
    ok.

bad_table_op({Opts,Priv,Prot}, Op) ->
    %%io:format("Doing Op=~p on ~p's\n",[Op,Type]),
    T1 = ets_new(noname,Opts),
    bad_table_call(noname,Op),
    ets:delete(T1),
    bad_table_call(T1,Op),
    T2 = ets_new(named,[named_table | Opts]),
    ets:delete(T2),
    bad_table_call(named,Op),
    bad_table_call(T2,Op),
    bad_table_call(priv,Op),
    bad_table_call(Priv,Op),
    case element(3,Op) of
	update ->
	    bad_table_call(prot,Op),
	    bad_table_call(Prot,Op);
	read -> ok
    end.

bad_table_call(T,{F,Args,_}) ->
    {'EXIT',{badarg,_}} = (catch apply(ets, F, [T|Args]));
bad_table_call(T,{F,Args,_,tabarg_last}) ->
    {'EXIT',{badarg,_}} = (catch apply(ets, F, Args++[T]));
bad_table_call(T,{F,Args,_,{return,Return}}) ->
    try
	Return = apply(ets, F, [T|Args])
    catch
	error:badarg -> ok
    end.


%% Check rename of ets tables.
rename(Config) when is_list(Config) ->
    repeat_for_opts(fun rename_do/1, [write_concurrency, all_types]).

rename_do(Opts) ->
    EtsMem = etsmem(),
    ets_new(foobazz,[named_table, public | Opts]),
    ets:insert(foobazz,{foo,bazz}),
    ungermanbazz = ets:rename(foobazz,ungermanbazz),
    {'EXIT',{badarg, _}} = (catch ets:lookup(foobazz,foo)),
    [{foo,bazz}] = ets:lookup(ungermanbazz,foo),
    {'EXIT',{badarg,_}} =  (catch ets:rename(ungermanbazz,"no atom")),
    ets:delete(ungermanbazz),
    verify_etsmem(EtsMem).

%% Check rename of unnamed ets table.
rename_unnamed(Config) when is_list(Config) ->
    repeat_for_opts(fun rename_unnamed_do/1,
                    [write_concurrency,all_types]).

rename_unnamed_do(Opts) ->
    EtsMem = etsmem(),
    Tab = ets_new(bonkz,[public | Opts]),
    {'EXIT',{badarg, _}} = (catch ets:insert(bonkz,{foo,bazz})),
    bonkz = ets:info(Tab, name),
    Tab = ets:rename(Tab, tjabonkz),
    {'EXIT',{badarg, _}} = (catch ets:insert(tjabonkz,{foo,bazz})),
    tjabonkz = ets:info(Tab, name),
    ets:delete(Tab),
    verify_etsmem(EtsMem).

%% Rename a table with many fixations, and at the same time delete it.
evil_rename(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    evil_rename_1(old_hash, new_hash, [public,named_table]),
    evil_rename_1(old_tree, new_tree, [public,ordered_set,named_table]),
    wait_for_test_procs(true),
    verify_etsmem(EtsMem).

evil_rename_1(Old, New, Flags) ->
    process_flag(trap_exit, true),
    Old = ets_new(Old, Flags),
    Fixer = fun() -> ets:safe_fixtable(Old, true) end,
    crazy_fixtable(15000, Fixer),
    erlang:yield(),
    New = ets:rename(Old, New),
    erlang:yield(),
    ets:delete(New),
    ok.

crazy_fixtable(N, Fixer) ->
    Dracula = ets_new(count_dracula, [public]),
    ets:insert(Dracula, {count,0}),
    SpawnFun = fun() ->
		       Fixer(),
		       case ets:update_counter(Dracula, count, 1) rem 15 of
			   0 -> evil_creater_destroyer();
			   _ -> erlang:hibernate(erlang, error, [dont_wake_me])
		       end
	       end,
    crazy_fixtable_1(N, SpawnFun),
    crazy_fixtable_wait(N, Dracula),
    Dracula.

crazy_fixtable_wait(N, Dracula) ->
    case ets:lookup(Dracula, count) of
	[{count,N}] ->
	    ets:delete(Dracula);
	Other ->
	    io:format("~p\n", [Other]),
	    receive after 10 -> ok end,
	    crazy_fixtable_wait(N, Dracula)
    end.

crazy_fixtable_1(0, _) ->
    ok;
crazy_fixtable_1(N, Fun) ->
    %%FIXME my_spawn_link(Fun),
    my_spawn_link(Fun),
    crazy_fixtable_1(N-1, Fun).

evil_creater_destroyer() ->
    T1 = evil_create_fixed_tab(),
    ets:delete(T1).

evil_create_fixed_tab() ->
    T = ets_new(arne, [public]),
    ets:safe_fixtable(T, true),
    T.

%% Tests that the return values and errors are equal for set's and
%% ordered_set's where applicable.
interface_equality(Config) when is_list(Config) ->
    repeat_for_opts(fun interface_equality_do/1).

interface_equality_do(Opts) ->
    EtsMem = etsmem(),
    Set = ets_new(set,[set | Opts]),
    OrderedSet = ets_new(ordered_set,[ordered_set | Opts]),
    F = fun(X,T,FF) -> case X of
                           0 -> true;
                           _ ->
                               ets:insert(T, {X,
                                              integer_to_list(X),
                                              X rem 10}),
                               FF(X-1,T,FF)
                       end
        end,
    F(100,Set,F),
    F(100,OrderedSet,F),
    equal_results(ets, insert, Set, OrderedSet, [{a,"a"}]),
    equal_results(ets, insert, Set, OrderedSet, [{1,1,"1"}]),
    equal_results(ets, lookup, Set, OrderedSet, [10]),
    equal_results(ets, lookup, Set, OrderedSet, [1000]),
    equal_results(ets, delete, Set, OrderedSet, [10]),
    equal_results(ets, delete, Set, OrderedSet, [nott]),
    equal_results(ets, lookup, Set, OrderedSet, [1000]),
    equal_results(ets, insert, Set, OrderedSet, [10]),
    equal_results(ets, next, Set, OrderedSet, ['$end_of_table']),
    equal_results(ets, prev, Set, OrderedSet, ['$end_of_table']),
    equal_results(ets, match, Set, OrderedSet, [{'_','_','_'}]),
    equal_results(ets, match, Set, OrderedSet, [{'_','_','_','_'}]),
    equal_results(ets, match, Set, OrderedSet, [{$3,$2,2}]),
    equal_results(ets, match, Set, OrderedSet, ['_']),
    equal_results(ets, match, Set, OrderedSet, ['$1']),
    equal_results(ets, match, Set, OrderedSet, [{'_','$50',3}]),
    equal_results(ets, match, Set, OrderedSet, [['_','$50',3]]),
    equal_results(ets, match_delete, Set, OrderedSet, [{'_','_',4}]),
    equal_results(ets, match_delete, Set, OrderedSet, [{'_','_',4}]),
    equal_results(ets, match_object, Set, OrderedSet, [{'_','_',4}]),
    equal_results(ets, match_object, Set, OrderedSet, [{'_','_',5}]),
    equal_results(ets, match_object, Set, OrderedSet, [{'_','_',4}]),
    equal_results(ets, match_object, Set, OrderedSet, ['_']),
    equal_results(ets, match_object, Set, OrderedSet, ['$5011']),
    equal_results(ets, match_delete, Set, OrderedSet, ['$20']),
    equal_results(ets, lookup_element, Set, OrderedSet, [13,2]),
    equal_results(ets, lookup_element, Set, OrderedSet, [13,4]),
    equal_results(ets, lookup_element, Set, OrderedSet, [14,2]),
    equal_results(ets, delete, Set, OrderedSet, []),
    verify_etsmem(EtsMem).

equal_results(M, F, FirstArg1, FirstArg2 ,ACommon) ->
    Res = maybe_sort((catch apply(M,F, [FirstArg1 | ACommon]))),
    Res = maybe_sort((catch apply(M,F,[FirstArg2 | ACommon]))).

maybe_sort(L) when is_list(L) ->
    lists:sort(L);
maybe_sort({'EXIT',{Reason, List}}) when is_list(List) ->
    {'EXIT',{Reason, lists:map(fun({Module, Function, _, _}) ->
				       {Module, Function, '_'}
			       end,
			       List)}};
maybe_sort(Any) ->
    Any.

%% Test match, match_object and match_delete in ordered set's.
ordered_match(Config) when is_list(Config)->
    repeat_for_opts(fun ordered_match_do/1).

ordered_match_do(Opts) ->
    EtsMem = etsmem(),
    F = fun(X,T,FF) -> case X of
			   0 -> true;
			   _ ->
			       ets:insert(T, {X,
					      integer_to_list(X),
					      X rem 10,
					      X rem 100,
					      X rem 1000}),
			       FF(X-1,T,FF)
		       end
	end,
    T1 = ets_new(xxx,[ordered_set| Opts]),
    F(3000,T1,F),
    [[3,3],[3,3],[3,3]] = ets:match(T1, {'_','_','$1','$2',3}),
    F2 = fun(X,Rem,Res,FF) -> case X of
				  0 -> [];
				  _ ->
				      case X rem Rem of
					  Res ->
					      FF(X-1,Rem,Res,FF) ++
						  [{X,
						    integer_to_list(X),
						    X rem 10,
						    X rem 100,
						    X rem 1000}];
					  _ ->
					      FF(X-1,Rem,Res,FF)
				      end
			      end
	 end,
    OL1 = F2(3000,100,2,F2),
    OL1 = ets:match_object(T1, {'_','_','_',2,'_'}),
    true = ets:match_delete(T1,{'_','_','_',2,'_'}),
    [] = ets:match_object(T1, {'_','_','_',2,'_'}),
    OL2 = F2(3000,100,3,F2),
    OL2 = ets:match_object(T1, {'_','_','_',3,'_'}),
    ets:delete(T1),
    verify_etsmem(EtsMem).


%% Test basic functionality in ordered_set's.
ordered(Config) when is_list(Config) ->
    repeat_for_opts(fun ordered_do/1).

ordered_do(Opts) ->
    EtsMem = etsmem(),
    T = ets_new(oset, [ordered_set | Opts]),
    InsList = [
	       25,26,27,28,
	       5,6,7,8,
	       21,22,23,24,
	       9,10,11,12,
	       1,2,3,4,
	       17,18,19,20,
	       13,14,15,16,
	       1 bsl 33
	      ],
    lists:foreach(fun(X) ->
			  ets:insert(T,{X,integer_to_list(X)})
		  end,
		  InsList),
    IL2 = lists:map(fun(X) -> {X,integer_to_list(X)} end, InsList),
    L1 = pick_all_forward(T),
    L2 = pick_all_backwards(T),
    S1 = lists:sort(IL2),
    S2 = lists:reverse(lists:sort(IL2)),
    S1 = L1,
    S2 = L2,
    [{1,"1"}] = ets:slot(T,0),
    [{28,"28"}] = ets:slot(T,27),
    [{1 bsl 33,_}] = ets:slot(T,28),
    27 = ets:prev(T,28),
    [{7,"7"}] = ets:slot(T,6),
    '$end_of_table' = ets:next(T,1 bsl 33),
    [{12,"12"}] = ets:slot(T,11),
    '$end_of_table' = ets:slot(T,29),
    [{1,"1"}] = ets:slot(T,0),
    28 = ets:prev(T,1 bsl 33),
    1 = ets:next(T,0),
    pick_all_forward(T),
    [{7,"7"}] = ets:slot(T,6),
    L2 = pick_all_backwards(T),
    [{7,"7"}] = ets:slot(T,6),
    ets:delete(T),
    verify_etsmem(EtsMem).

pick_all(_T,'$end_of_table',_How) ->
    [];
pick_all(T,Last,How) ->
    This = case How of
	       next ->
		   ets:next(T,Last);
	       prev ->
		   ets:prev(T,Last)
	   end,
    [LastObj] = ets:lookup(T,Last),
    [LastObj | pick_all(T,This,How)].

pick_all_forward(T) ->
    pick_all(T,ets:first(T),next).
pick_all_backwards(T) ->
    pick_all(T,ets:last(T),prev).



%% Small test case for both set and bag type ets tables.
setbag(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    lists:foreach(fun(SetType) -> 
                          Set = ets_new(SetType,[SetType]),
                          Bag = ets_new(bag,[bag]),
                          Key = {foo,bar},
                          
                          %% insert some value
                          ets:insert(Set,{Key,val1}),
                          ets:insert(Bag,{Key,val1}),
                          
                          %% insert new value for same key again
                          ets:insert(Set,{Key,val2}),
                          ets:insert(Bag,{Key,val2}),
                          
                          %% check
                          [{Key,val2}] = ets:lookup(Set,Key),
                          [{Key,val1},{Key,val2}] = ets:lookup(Bag,Key),
                          
                          true = ets:delete(Set),
                          true = ets:delete(Bag)
                  end, [set, cat_ord_set,stim_cat_ord_set,ordered_set]),
    verify_etsmem(EtsMem).

%% Test case to check proper return values for illegal ets_new() calls.
badnew(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    {'EXIT',{badarg,_}} = (catch ets:new(12,[])),
    {'EXIT',{badarg,_}} = (catch ets:new({a,b},[])),
    {'EXIT',{badarg,_}} = (catch ets:new(name,[foo])),
    {'EXIT',{badarg,_}} = (catch ets:new(name,{bag})),
    {'EXIT',{badarg,_}} = (catch ets:new(name,bag)),
    verify_etsmem(EtsMem).

%% OTP-2314. Test case to check that a non-proper list does not
%% crash the emulator.
verybadnew(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    {'EXIT',{badarg,_}} = (catch ets:new(verybad,[set|protected])),
    verify_etsmem(EtsMem).

%% Small check to see if named tables work.
named(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    Tab = make_table(foo,
		     [named_table],
		     [{key,val}]),
    [{key,val}] = ets:lookup(foo,key),
    true = ets:delete(Tab),
    verify_etsmem(EtsMem).

%% Test case to check if specified keypos works.
keypos2(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    lists:foreach(fun(SetType) -> 
                          Tab = make_table(foo,
                                           [SetType,{keypos,2}],
                                           [{val,key}, {val2,key}]),
                          [{val2,key}] = ets:lookup(Tab,key),
                          true = ets:delete(Tab)
                  end, [set, cat_ord_set,stim_cat_ord_set,ordered_set]),
    verify_etsmem(EtsMem).

%% Privacy check. Check that a named(public/private/protected) table
%% cannot be read by the wrong process(es).
privacy(Config) when is_list(Config) ->
    repeat_for_opts(fun privacy_do/1).

privacy_do(Opts) ->
    EtsMem = etsmem(),
    process_flag(trap_exit,true),
    Parent = self(),
    Owner = my_spawn_link(fun() -> privacy_owner(Parent, Opts) end),
    receive
	{'EXIT',Owner,Reason} ->
	    exit({privacy_test,Reason});
	ok ->
	    ok
    end,

    privacy_check(pub,prot,priv),

    Owner ! {shift,1,{pub,prot,priv}},
    receive
        {Pub1,Prot1,Priv1} ->
            ok = privacy_check(Pub1,Prot1,Priv1),
            Owner ! {shift,2,{Pub1,Prot1,Priv1}}
    end,

    receive
        {Pub2,Prot2,Priv2} ->
            ok = privacy_check(Pub2,Prot2,Priv2),
            Owner ! {shift,0,{Pub2,Prot2,Priv2}}
    end,

    receive
        {Pub3,Prot3,Priv3} ->
            ok = privacy_check(Pub3,Prot3,Priv3)
    end,

    Owner ! die,
    receive {'EXIT',Owner,_} -> ok end,
    verify_etsmem(EtsMem).

privacy_check(Pub,Prot,Priv) ->
    %% check read rights
    [] = ets:lookup(Pub, foo),
    [] = ets:lookup(Prot,foo),
    {'EXIT',{badarg,_}} = (catch ets:lookup(Priv,foo)),

    %% check write rights
    true = ets:insert(Pub, {1,foo}),
    {'EXIT',{badarg,_}} = (catch ets:insert(Prot,{2,foo})),
    {'EXIT',{badarg,_}} = (catch ets:insert(Priv,{3,foo})),

    %% check that it really wasn't written, either
    [] = ets:lookup(Prot,foo),
    ok.

privacy_owner(Boss, Opts) ->
    ets_new(pub, [public,named_table | Opts]),
    ets_new(prot,[protected,named_table | Opts]),
    ets_new(priv,[private,named_table | Opts]),
    Boss ! ok,
    privacy_owner_loop(Boss).

privacy_owner_loop(Boss) ->
    receive
	{shift,N,Pub_Prot_Priv} ->
	    {Pub,Prot,Priv} = rotate_tuple(Pub_Prot_Priv, N),

	    ets:setopts(Pub,{protection,public}),
	    ets:setopts(Prot,{protection,protected}),
	    ets:setopts(Priv,{protection,private}),
	    Boss ! {Pub,Prot,Priv},
	    privacy_owner_loop(Boss);

	die -> ok
    end.

rotate_tuple(Tuple, 0) ->
    Tuple;
rotate_tuple(Tuple, N) ->
    [H|T] = tuple_to_list(Tuple),
    rotate_tuple(list_to_tuple(T ++ [H]), N-1).


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%% Check lookup in an empty table and lookup of a non-existing key.
empty(Config) when is_list(Config) ->
    repeat_for_opts_all_table_types(fun empty_do/1).

empty_do(Opts) ->
    EtsMem = etsmem(),
    Tab = ets_new(foo,Opts),
    [] = ets:lookup(Tab,key),
    true = ets:insert(Tab,{key2,val}),
    [] = ets:lookup(Tab,key),
    true = ets:delete(Tab),
    verify_etsmem(EtsMem).

%% Check proper return values for illegal insert operations.
badinsert(Config) when is_list(Config) ->
    repeat_for_opts_all_table_types(fun badinsert_do/1).

badinsert_do(Opts) ->
    EtsMem = etsmem(),
    {'EXIT',{badarg,_}} = (catch ets:insert(foo,{key,val})),

    Tab = ets_new(foo,Opts),
    {'EXIT',{badarg,_}} = (catch ets:insert(Tab,{})),

    Tab3 = ets_new(foo,[{keypos,3}| Opts]),
    {'EXIT',{badarg,_}} = (catch ets:insert(Tab3,{a,b})),

    {'EXIT',{badarg,_}} = (catch ets:insert(Tab,[key,val2])),
    true = ets:delete(Tab),
    true = ets:delete(Tab3),
    verify_etsmem(EtsMem).

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%% Check proper return values from bad lookups in existing/non existing
%% ets tables.
badlookup(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    {'EXIT',{badarg,_}} = (catch ets:lookup(foo,key)),
    Tab = ets_new(foo,[]),
    ets:delete(Tab),
    {'EXIT',{badarg,_}} = (catch ets:lookup(Tab,key)),
    verify_etsmem(EtsMem).

%% Test that lookup returns objects in order of insertion for bag and dbag.
lookup_order(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts(fun lookup_order_do/1,
                    [write_concurrency,[bag,duplicate_bag]]),
    verify_etsmem(EtsMem),
    ok.

lookup_order_do(Opts) ->
    lookup_order_2(Opts, false),
    lookup_order_2(Opts, true).

lookup_order_2(Opts, Fixed) ->
    io:format("Opts=~p Fixed=~p\n",[Opts,Fixed]),

    A = 1, B = 2, C = 3,
    ABC = [A,B,C],
    Pair = [{A,B},{B,A},{A,C},{C,A},{B,C},{C,B}],
    Combos = [{D1,D2,D3} || D1<-ABC, D2<-Pair, D3<-Pair],
    lists:foreach(fun({D1,{D2a,D2b},{D3a,D3b}}) ->
			  T = ets_new(foo,Opts),
			  case Fixed of
			      true -> ets:safe_fixtable(T,true);
			      false -> ok
			  end,
			  S10 = {T,[],key},
			  S20 = check_insert(S10,A),
			  S30 = check_insert(S20,B),
			  S40 = check_insert(S30,C),
			  S50 = check_delete(S40,D1),
			  S55 = check_insert(S50,D1),
			  S60 = check_insert(S55,D1),
			  S70 = check_delete(S60,D2a),
			  S80 = check_delete(S70,D2b),
			  S90 = check_insert(S80,D2a),
			  SA0 = check_delete(S90,D3a),
			  SB0 = check_delete(SA0,D3b),
			  check_insert_new(SB0,D3b),

			  true = ets:delete(T)
		  end,
		  Combos).


check_insert({T,List0,Key},Val) ->
    %%io:format("insert ~p into ~p\n",[Val,List0]),
    ets:insert(T,{Key,Val}),
    List1 = case (ets:info(T,type) =:= bag andalso
		  lists:member({Key,Val},List0)) of
		true -> List0;
		false -> [{Key,Val} | List0]
	    end,
    check_check({T,List1,Key}).

check_insert_new({T,List0,Key},Val) ->
    %%io:format("insert_new ~p into ~p\n",[Val,List0]),
    Ret = ets:insert_new(T,{Key,Val}),
    Ret = (List0 =:= []),
    List1 = case Ret of
		true -> [{Key,Val}];
		false -> List0
	    end,
    check_check({T,List1,Key}).


check_delete({T,List0,Key},Val) ->
    %%io:format("delete ~p from ~p\n",[Val,List0]),
    ets:delete_object(T,{Key,Val}),
    List1 = lists:filter(fun(Obj) -> Obj =/= {Key,Val} end,
			 List0),
    check_check({T,List1,Key}).

check_check(S={T,List,Key}) ->
    case lists:reverse(ets:lookup(T,Key)) of
	List -> ok;
        ETS -> io:format("check failed:\nETS: ~p\nCHK: ~p\n", [ETS,List]),
	       ct:fail("Invalid return value from ets:lookup")
    end,
    Items = ets:info(T,size),
    Items = length(List),
    S.

fill_tab(Tab,Val) ->
    ets:insert(Tab,{key,Val}),
    ets:insert(Tab,{{a,144},Val}),
    ets:insert(Tab,{{a,key2},Val}),
    ets:insert(Tab,{14,Val}),
    ok.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%% OTP-2386. Multiple return elements.
lookup_element_mult(Config) when is_list(Config) ->
    repeat_for_opts(fun lookup_element_mult_do/1).

lookup_element_mult_do(Opts) ->
    EtsMem = etsmem(),
    T = ets_new(service, [bag, {keypos, 2} | Opts]),
    D = lists:reverse(lem_data()),
    lists:foreach(fun(X) -> ets:insert(T, X) end, D),
    ok = lem_crash_3(T),
    ets:insert(T, {0, "heap_key"}),
    ets:lookup_element(T, "heap_key", 2),
    true = ets:delete(T),
    verify_etsmem(EtsMem).

lem_data() ->
    [{service,'eddie2@boromir',{150,236,14,103},httpd88,self()},
     {service,'eddie2@boromir',{150,236,14,103},httpd80,self()},
     {service,'eddie3@boromir',{150,236,14,107},httpd88,self()},
     {service,'eddie3@boromir',{150,236,14,107},httpd80,self()},
     {service,'eddie4@boromir',{150,236,14,108},httpd88,self()}].

lem_crash(T) ->
    L = ets:lookup_element(T, 'eddie2@boromir', 3),
    {erlang:phash(L, 256), L}.

lem_crash_3(T) ->
    lem_crash(T),
    io:format("Survived once~n"),
    lem_crash(T),
    io:format("Survived twice~n"),
    lem_crash(T),
    io:format("Survived all!~n"),
    ok.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%% Check delete of an element inserted in a `filled' table.
delete_elem(Config) when is_list(Config) ->
    repeat_for_opts(fun delete_elem_do/1,
                    [write_concurrency, all_types]).

delete_elem_do(Opts) ->
    EtsMem = etsmem(),
    Tab = ets_new(foo,Opts),
    fill_tab(Tab,foo),
    ets:insert(Tab,{{b,key},foo}),
    ets:insert(Tab,{{c,key},foo}),
    true = ets:delete(Tab,{b,key}),
    [] = ets:lookup(Tab,{b,key}),
    [{{c,key},foo}] = ets:lookup(Tab,{c,key}),
    true = ets:delete(Tab),
    verify_etsmem(EtsMem).

%% Check that ets:delete() works and releases the name of the
%% deleted table.
delete_tab(Config) when is_list(Config) ->
    repeat_for_opts(fun delete_tab_do/1,
                    [write_concurrency,all_types]).

delete_tab_do(Opts) ->
    Name = foo,
    EtsMem = etsmem(),
    Name = ets_new(Name, [named_table | Opts]),
    true = ets:delete(foo),
    %% The name should be available again.
    Name = ets_new(Name, [named_table | Opts]),
    true = ets:delete(Name),
    verify_etsmem(EtsMem).

%% Check that ets:delete/1 works and that other processes can run.
delete_large_tab(Config) when is_list(Config) ->
    ct:timetrap({minutes,60}), %% valgrind needs a lot
    KeyRange = 16#ffffff,
    Data = [{erlang:phash2(I, KeyRange),I} || I <- lists:seq(1, 200000)],
    EtsMem = etsmem(),
    repeat_for_opts(fun(Opts) -> delete_large_tab_do(Config,
                                                     key_range(Opts,KeyRange),
                                                     Data)
                    end),
    verify_etsmem(EtsMem).

delete_large_tab_do(Config, Opts,Data) ->
    delete_large_tab_1(Config, foo_hash, Opts, Data, false),
    delete_large_tab_1(Config, foo_tree, [ordered_set | Opts], Data, false),
    delete_large_tab_1(Config, foo_tree, [stim_cat_ord_set | Opts], Data, false),
    delete_large_tab_1(Config, foo_hash_fix, Opts, Data, true).


delete_large_tab_1(Config, Name, Flags, Data, Fix) ->
    case is_redundant_opts_combo(Flags) of
        true -> skip;
        false ->
            delete_large_tab_2(Config, Name, Flags, Data, Fix)
    end.

delete_large_tab_2(Config, Name, Flags, Data, Fix) ->
    Tab = ets_new(Name, Flags),
    ets:insert(Tab, Data),

    case Fix of
	false -> ok;
	true ->
	    true = ets:safe_fixtable(Tab, true),
	    lists:foreach(fun({K,_}) -> ets:delete(Tab, K) end, Data)
    end,

    {priority, Prio} = process_info(self(), priority),
    Deleter = self(),
    ForceTrap = proplists:get_bool(ets_force_trap, Config),
    [SchedTracer]
	= start_loopers(1,
			Prio,
			fun (SC) ->
				receive
				    {trace, Deleter, out, _} ->
                                        case {ets:info(Tab), SC, ForceTrap} of
                                            {undefined, _, _} -> ok;
                                            {_, 0, true} ->
                                                %% Forced first trap of ets:delete,
                                                %% tab still reachable
                                                ok
                                        end,
                                        SC+1;
				    {trace,
				     Deleter,
				     register,
				     delete_large_tab_done_marker}->
					Deleter ! {schedule_count, SC},
					exit(normal);
				    _ ->
					SC
				end
			end,
			0),
    SchedTracerMon = monitor(process, SchedTracer),
    Loopers = start_loopers(erlang:system_info(schedulers),
			    Prio,
			    fun (_) -> erlang:yield() end,
			    ok),
    erlang:yield(),
    1 = erlang:trace(self(),true,[running,procs,{tracer,SchedTracer}]),
    true = ets:delete(Tab),
    %% The register stuff is just a trace marker
    true = register(delete_large_tab_done_marker, self()),
    true = unregister(delete_large_tab_done_marker),
    undefined = ets:info(Tab),
    ok = stop_loopers(Loopers),
    receive
	{schedule_count, N} ->
	    io:format("~s: context switches: ~p", [Name,N]),
	    if
		N >= 5 -> ok;
		true -> ct:fail(failed)
	    end
    end,
    receive {'DOWN',SchedTracerMon,process,SchedTracer,_} -> ok end,
    ok.

%% Delete a large name table and try to create a new table with
%% the same name in another process.
delete_large_named_table(Config) when is_list(Config) ->
    KeyRange = 16#ffffff,
    Data = [{erlang:phash2(I, KeyRange),I} || I <- lists:seq(1, 200000)],
    EtsMem = etsmem(),
    repeat_for_opts(fun(Opts) ->
                            delete_large_named_table_do(key_range(Opts,KeyRange),
                                                        Data)
                    end),
    verify_etsmem(EtsMem),
    ok.

delete_large_named_table_do(Opts,Data) ->
    delete_large_named_table_1(foo_hash, [named_table | Opts], Data, false),
    delete_large_named_table_1(foo_tree, [ordered_set,named_table | Opts], Data, false),
    delete_large_named_table_1(foo_tree, [stim_cat_ord_set,named_table | Opts], Data, false),
    delete_large_named_table_1(foo_hash, [named_table | Opts], Data, true).

delete_large_named_table_1(Name, Flags, Data, Fix) ->
    case is_redundant_opts_combo(Flags) of
        true -> skip;
        false ->
            delete_large_named_table_2(Name, Flags, Data, Fix)
    end.

delete_large_named_table_2(Name, Flags, Data, Fix) ->
    Tab = ets_new(Name, Flags),
    ets:insert(Tab, Data),

    case Fix of
	false -> ok;
	true ->
	    true = ets:safe_fixtable(Tab, true),
	    lists:foreach(fun({K,_}) -> ets:delete(Tab, K) end, Data)
    end,
    {Pid, MRef} = my_spawn_opt(fun() ->
				       receive
					   ets_new ->
					       ets_new(Name, [named_table])
				       end
			       end,
			       [link, monitor]),
    true = ets:delete(Tab),
    Pid ! ets_new,
    receive {'DOWN',MRef,process,Pid,_} -> ok end,
    ok.

%% Delete a large table, and kill the process during the delete.
evil_delete(Config) when is_list(Config) ->
    KeyRange = 100000,
    Data = [{I,I*I} || I <- lists:seq(1, KeyRange)],
    repeat_for_opts(fun(Opts) ->
                            evil_delete_do(key_range(Opts,KeyRange),
                                           Data)
                    end).

evil_delete_do(Opts,Data) ->
    EtsMem = etsmem(),
    evil_delete_owner(foo_hash, Opts, Data, false),
    verify_etsmem(EtsMem),
    evil_delete_owner(foo_hash, Opts, Data, true),
    verify_etsmem(EtsMem),
    evil_delete_owner(foo_tree, [ordered_set | Opts], Data, false),
    verify_etsmem(EtsMem),
    evil_delete_owner(foo_catree, [stim_cat_ord_set | Opts], Data, false),
    verify_etsmem(EtsMem),
    TabA = evil_delete_not_owner(foo_hash, Opts, Data, false),
    verify_etsmem(EtsMem),
    TabB = evil_delete_not_owner(foo_hash, Opts, Data, true),
    verify_etsmem(EtsMem),
    TabC = evil_delete_not_owner(foo_tree, [ordered_set | Opts], Data, false),
    verify_etsmem(EtsMem),
    TabD = evil_delete_not_owner(foo_catree, [stim_cat_ord_set | Opts], Data, false),
    verify_etsmem(EtsMem),
    lists:foreach(fun(T) -> undefined = ets:info(T) end,
		  [TabA,TabB,TabC,TabD]).

evil_delete_not_owner(Name, Flags, Data, Fix) ->
    case is_redundant_opts_combo(Flags) of
        true -> skip;
        false ->
            evil_delete_not_owner_1(Name, Flags, Data, Fix)
    end.

evil_delete_not_owner_1(Name, Flags, Data, Fix) ->
    io:format("Not owner: ~p, fix = ~p", [Name,Fix]),
    Tab = ets_new(Name, [public|Flags]),
    ets:insert(Tab, Data),
    case Fix of
	false -> ok;
	true ->
	    true = ets:safe_fixtable(Tab, true),
	    lists:foreach(fun({K,_}) -> ets:delete(Tab, K) end, Data)
    end,
    Pid = my_spawn(fun() ->
			   P = my_spawn_link(
				 fun() ->
					 receive kill -> ok end,
					 erlang:yield(),
					 exit(kill_linked_processes_now)
				 end),
			   erlang:yield(),
			   P ! kill,
			   true = ets:delete(Tab)
		   end),
    Ref = erlang:monitor(process, Pid),
    receive {'DOWN',Ref,_,_,_} -> ok end,
    Tab.

evil_delete_owner(Name, Flags, Data, Fix) ->
    case is_redundant_opts_combo(Flags) of
        true -> skip;
        false ->
            evil_delete_owner_1(Name, Flags, Data, Fix)
    end.

evil_delete_owner_1(Name, Flags, Data, Fix) ->
    Fun = fun() ->
		  Tab = ets_new(Name, [public|Flags]),
		  ets:insert(Tab, Data),
		  case Fix of
		      false -> ok;
		      true ->
			  true = ets:safe_fixtable(Tab, true),
			  lists:foreach(fun({K,_}) ->
						ets:delete(Tab, K)
					end, Data)
		  end,
		  erlang:yield(),
		  my_spawn_link(fun() ->
					erlang:yield(),
					exit(kill_linked_processes_now)
				end),
		  true = ets:delete(Tab)
	  end,
    Pid = my_spawn(Fun),
    Ref = erlang:monitor(process, Pid),
    receive {'DOWN',Ref,_,_,_} -> ok end.


exit_large_table_owner(Config) when is_list(Config) ->
    %%Data = [{erlang:phash2(I, 16#ffffff),I} || I <- lists:seq(1, 500000)],
    Laps = 500000 div syrup_factor(),
    FEData = fun(Do) -> repeat_while(fun(I) when I =:= Laps -> {false,ok};
					(I) -> Do({erlang:phash2(I, 16#ffffff),I}),
					       {true, I+1}
				     end, 1)
	     end,
    EtsMem = etsmem(),
    repeat_for_opts(fun(Opts) ->
                            exit_large_table_owner_do(Opts,
                                                      FEData,
                                                      Config)
                    end),
    verify_etsmem(EtsMem).

exit_large_table_owner_do(Opts, FEData, Config) ->
    verify_rescheduling_exit(Config, FEData, [named_table | Opts], true, 1, 1),
    verify_rescheduling_exit(Config, FEData, Opts, false, 1, 1).

exit_many_large_table_owner(Config) when is_list(Config) ->
    ct:timetrap({minutes,30}), %% valgrind needs a lot
    %%Data = [{erlang:phash2(I, 16#ffffff),I} || I <- lists:seq(1, 500000)],
    Laps = 500000 div syrup_factor(),
    FEData = fun(Do) -> repeat_while(fun(I) when I =:= Laps -> {false,ok};
					(I) -> Do({erlang:phash2(I, 16#ffffff),I}),
					       {true, I+1}
				     end, 1)
	     end,
    EtsMem = etsmem(),
    repeat_for_opts(fun(Opts) -> exit_many_large_table_owner_do(Opts,FEData,Config) end),
    verify_etsmem(EtsMem).

exit_many_large_table_owner_do(Opts,FEData,Config) ->
    verify_rescheduling_exit(Config, FEData, Opts, true, 1, 4),
    verify_rescheduling_exit(Config, FEData, [named_table | Opts], false, 1, 4).

exit_many_tables_owner(Config) when is_list(Config) ->
    NoData = fun(_Do) -> ok end,
    EtsMem = etsmem(),
    verify_rescheduling_exit(Config, NoData, [named_table], false, 1000, 1),
    verify_rescheduling_exit(Config, NoData, [named_table,{write_concurrency,true}], false, 1000, 1),
    verify_etsmem(EtsMem).

exit_many_many_tables_owner(Config) when is_list(Config) ->
    Data = [{erlang:phash2(I, 16#ffffff),I} || I <- lists:seq(1, 50)],
    FEData = fun(Do) -> lists:foreach(Do, Data) end,
    repeat_for_opts(fun(Opts) -> exit_many_many_tables_owner_do(Opts,FEData,Config) end).

exit_many_many_tables_owner_do(Opts,FEData,Config) ->
    verify_rescheduling_exit(Config, FEData, [named_table | Opts], true, 200, 5),
    verify_rescheduling_exit(Config, FEData, Opts, false, 200, 5),
    wait_for_test_procs(),
    EtsMem = etsmem(),
    verify_rescheduling_exit(Config, FEData, Opts, true, 200, 5),
    verify_rescheduling_exit(Config, FEData, [named_table | Opts], false, 200, 5),
    verify_etsmem(EtsMem).


count_exit_sched(TP) ->
    receive
	{trace, TP, in_exiting, 0} ->
	    count_exit_sched_out(TP, 1);
	{trace, TP, out_exiting, 0} ->
	    count_exit_sched_in(TP, 1);
	{trace, TP, out_exited, 0} ->
	    0
    end.

count_exit_sched_in(TP, N) ->
    receive
	{trace, TP, in_exiting, 0} ->
	    count_exit_sched_out(TP, N);
	{trace, TP, _, _} = Msg ->
	    exit({unexpected_trace_msg, Msg})
    end.

count_exit_sched_out(TP, N) ->
    receive
	{trace, TP, out_exiting, 0} ->
	    count_exit_sched_in(TP, N+1);
	{trace, TP, out_exited, 0} ->
	    N;
	{trace, TP, _, _} = Msg ->
	    exit({unexpected_trace_msg, Msg})
    end.

vre_fix_tables(Tab) ->
    Parent = self(),
    Go = make_ref(),
    my_spawn_link(fun () ->
			  true = ets:safe_fixtable(Tab, true),
			  Parent ! Go,
			  receive infinity -> ok end
		  end),
    receive Go -> ok end,
    ok.

verify_rescheduling_exit(Config, ForEachData, Flags, Fix, NOTabs, NOProcs) ->
    NoFix = 5,
    TestCase = atom_to_list(proplists:get_value(test_case, Config)),
    Parent = self(),
    KillMe = make_ref(),
    PFun =
	fun () ->
		repeat(
		  fun () ->
			  Uniq = erlang:unique_integer([positive]),
			  Name = list_to_atom(TestCase ++ "-" ++
						  integer_to_list(Uniq)),
			  Tab = ets_new(Name, Flags),
                          ForEachData(fun(Data) -> ets:insert(Tab, Data) end),
			  case Fix of
			      false -> ok;
			      true ->
				  lists:foreach(fun (_) ->
							vre_fix_tables(Tab)
						end,
						lists:seq(1,NoFix)),
                                  KeyPos = ets:info(Tab,keypos),
                                  ForEachData(fun(Data) ->
						      ets:delete(Tab, element(KeyPos,Data))
                                              end)
			  end
		  end,
		  NOTabs),
		Parent ! {KillMe, self()},
		receive after infinity -> ok end
	end,
    TPs = lists:map(fun (_) ->
			    TP = my_spawn_link(PFun),
			    1 = erlang:trace(TP, true, [exiting]),
			    TP
		    end,
		    lists:seq(1, NOProcs)),
    lists:foreach(fun (TP) ->
			  receive {KillMe, TP} -> ok end
		  end,
		  TPs),
    LPs = start_loopers(erlang:system_info(schedulers),
			normal,
			fun (_) ->
				erlang:yield()
			end,
			ok),
    lists:foreach(fun (TP) ->
			  unlink(TP),
			  exit(TP, bang)
		  end,
		  TPs),
    lists:foreach(fun (TP) ->
			  XScheds = count_exit_sched(TP),
			  io:format("~p XScheds=~p~n",
				    [TP, XScheds]),
			  true = XScheds >= 3
		  end,
		  TPs),
    stop_loopers(LPs),
    ok.



%% Make sure that slots for ets tables are cleared properly.
table_leak(Config) when is_list(Config) ->
    repeat_for_opts_all_non_stim_table_types(fun(Opts) -> table_leak_1(Opts,20000) end).

table_leak_1(_,0) -> ok;
table_leak_1(Opts,N) ->
    T = ets_new(fooflarf, Opts),
    true = ets:delete(T),
    table_leak_1(Opts,N-1).

%% Check proper return values for illegal delete operations.
baddelete(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    {'EXIT',{badarg,_}} = (catch ets:delete(foo)),
    Tab = ets_new(foo,[]),
    true = ets:delete(Tab),
    {'EXIT',{badarg,_}} = (catch ets:delete(Tab)),
    verify_etsmem(EtsMem).

%% Check that match_delete works. Also tests tab2list function.
match_delete(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts(fun match_delete_do/1,
                    [write_concurrency,all_types]),
    verify_etsmem(EtsMem).

match_delete_do(Opts) ->
    EtsMem = etsmem(),
    Tab = ets_new(kad,Opts),
    fill_tab(Tab,foo),
    ets:insert(Tab,{{c,key},bar}),
    _ = ets:match_delete(Tab,{'_',foo}),
    [{{c,key},bar}] = ets:tab2list(Tab),
    _ = ets:match_delete(Tab,'_'),
    [] = ets:tab2list(Tab),
    true = ets:delete(Tab),
    verify_etsmem(EtsMem).

%% OTP-3005: check match_delete with constant argument.
match_delete3(Config) when is_list(Config) ->
    repeat_for_opts(fun match_delete3_do/1).

match_delete3_do(Opts) ->
    EtsMem = etsmem(),
    T = make_table(test,
		   [duplicate_bag | Opts],
		   [{aa,17},
		    {cA,1000},
		    {cA,17},
		    {cA,1000},
		    {aa,17}]),
    %% 'aa' and 'cA' have the same hash value in the current
    %% implementation. This causes the aa's to precede the cA's, to make
    %% the test more interesting.
    [{cA,1000},{cA,1000}] = ets:match_object(T, {'_', 1000}),
    ets:match_delete(T, {cA,1000}),
    [] = ets:match_object(T, {'_', 1000}),
    ets:delete(T),
    verify_etsmem(EtsMem).


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%% Test ets:first/1 & ets:next/2.
firstnext(Config) when is_list(Config) ->
    repeat_for_opts_all_set_table_types(fun firstnext_do/1).

firstnext_do(Opts) ->
    EtsMem = etsmem(),
    Tab = ets_new(foo,Opts),
    [] = firstnext_collect(Tab,ets:first(Tab),[]),
    fill_tab(Tab,foo),
    Len = length(ets:tab2list(Tab)),
    Len = length(firstnext_collect(Tab,ets:first(Tab),[])),
    true = ets:delete(Tab),
    verify_etsmem(EtsMem).

firstnext_collect(_Tab,'$end_of_table',List) ->
    List;
firstnext_collect(Tab,Key,List) ->
    firstnext_collect(Tab,ets:next(Tab,Key),[Key|List]).


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%% Tests ets:first/1 & ets:next/2.
firstnext_concurrent(Config) when is_list(Config) ->
    lists:foreach(
      fun(TableType) -> 
              register(master, self()),
              TableName = list_to_atom(atom_to_list(?MODULE) ++ atom_to_list(TableType)),
              ets_init(TableName, 20, TableType),
              [dynamic_go(TableName) || _ <- lists:seq(1, 2)],
              receive
              after 5000 -> ok
              end,
              unregister(master)
      end, repeat_for_opts_atom2list(ord_set_types)).

ets_init(Tab, N, TableType) ->
    ets_new(Tab, [named_table,public,TableType]),
    cycle(Tab, lists:seq(1,N+1)).

cycle(_Tab, [H|T]) when H > length(T)-> ok;
cycle(Tab, L) ->
    ets:insert(Tab,list_to_tuple(L)),
    cycle(Tab, tl(L)++[hd(L)]).

dynamic_go(TableName) -> my_spawn_link(fun() -> dynamic_init(TableName) end).

dynamic_init(TableName) -> [dyn_lookup(TableName) || _ <- lists:seq(1, 10)].

dyn_lookup(T) -> dyn_lookup(T, ets:first(T)).

dyn_lookup(_T, '$end_of_table') -> [];
dyn_lookup(T, K) ->
    NextKey = ets:next(T,K),
    case ets:next(T,K) of
	NextKey ->
	    dyn_lookup(T, NextKey);
	NK ->
	    io:fwrite("hmmm... ~p =/= ~p~n", [NextKey,NK]),
	    exit(failed)
    end.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

slot(Config) when is_list(Config) ->
    repeat_for_opts_all_set_table_types(fun slot_do/1).

slot_do(Opts) ->
    EtsMem = etsmem(),
    Tab = ets_new(foo,Opts),
    fill_tab(Tab,foo),
    Elts = ets:info(Tab,size),
    Elts = slot_loop(Tab,0,0),
    case ets:info(Tab, type) of
        ordered_set ->
            '$end_of_table' = ets:slot(Tab,Elts);
        _ -> ok
    end,
    true = ets:delete(Tab),
    verify_etsmem(EtsMem).

slot_loop(Tab,SlotNo,EltsSoFar) ->
    case ets:slot(Tab,SlotNo) of
	'$end_of_table' ->
	    {'EXIT',{badarg,_}} =
		(catch ets:slot(Tab,SlotNo+1)),
	    EltsSoFar;
	Elts ->
	    slot_loop(Tab,SlotNo+1,EltsSoFar+length(Elts))
    end.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

hash_clash(Config) when is_list(Config) ->
    %% ensure that erlang:phash2 and ets:slot use different hash seed
    Tab = ets:new(tab, [set]),
    Buckets = erlang:element(1, ets:info(Tab, stats)),
    Phash = erlang:phash2(<<"123">>, Buckets),
    true = ets:insert(Tab, {<<"123">>, "extra"}),
    [] = ets:slot(Tab, Phash).

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


match1(Config) when is_list(Config) ->
    repeat_for_opts_all_set_table_types(fun match1_do/1).

match1_do(Opts) ->
    EtsMem = etsmem(),
    Tab = ets_new(foo,Opts),
    fill_tab(Tab,foo),
    [] = ets:match(Tab,{}),
    ets:insert(Tab,{{one,4},4}),
    ets:insert(Tab,{{one,5},5}),
    ets:insert(Tab,{{two,4},4}),
    ets:insert(Tab,{{two,5},6}),
    case ets:match(Tab,{{one,'_'},'$0'}) of
	[[4],[5]] -> ok;
	[[5],[4]] -> ok
    end,
    case ets:match(Tab,{{two,'$1'},'$0'}) of
	[[4,4],[6,5]] -> ok;
	[[6,5],[4,4]] -> ok
    end,
    case ets:match(Tab,{{two,'$9'},'$4'}) of
	[[4,4],[6,5]] -> ok;
	[[6,5],[4,4]] -> ok
    end,
    case ets:match(Tab,{{two,'$9'},'$22'}) of
	[[4,4],[5,6]] -> ok;
	[[5,6],[4,4]] -> ok
    end,
    [[4]] = ets:match(Tab,{{two,'$0'},'$0'}),
    Len = length(ets:match(Tab,'$0')),
    Len = length(ets:match(Tab,'_')),
    if Len > 4 -> ok end,
    true = ets:delete(Tab),
    verify_etsmem(EtsMem).

%% Test match with specified keypos bag table.
match2(Config) when is_list(Config) ->
    repeat_for_opts(fun match2_do/1).

match2_do(Opts) ->
    EtsMem = etsmem(),
    Tab = make_table(foobar,
		     [bag, named_table, {keypos, 2} | Opts],
		     [{value1, key1},
		      {value2_1, key2},
		      {value2_2, key2},
		      {value3_1, key3},
		      {value3_2, key3},
		      {value2_1, key2_wannabe}]),
    case length(ets:match(Tab, '$1')) of
	6 -> ok;
	_ -> ct:fail("Length of matched list is wrong.")
    end,
    [[value3_1],[value3_2]] = ets:match(Tab, {'$1', key3}),
    [[key1]] = ets:match(Tab, {value1, '$1'}),
    [[key2_wannabe],[key2]] = ets:match(Tab, {value2_1, '$2'}),
    [] = ets:match(Tab,{'$1',nosuchkey}),
    [] = ets:match(Tab,{'$1',kgY2}), % same hash as key2
    [] = ets:match(Tab,{nosuchvalue,'$1'}),
    true = ets:delete(Tab),
    verify_etsmem(EtsMem).

%% Some ets:match_object tests.
match_object(Config) when is_list(Config) ->
    repeat_for_opts_all_set_table_types(fun match_object_do/1).

match_object_do(Opts) ->
    EtsMem = etsmem(),
    Tab = ets_new(foobar, Opts),
    fill_tab(Tab, foo),
    ets:insert(Tab,{{one,4},4}),
    ets:insert(Tab,{{one,5},5}),
    ets:insert(Tab,{{two,4},4}),
    ets:insert(Tab,{{two,5},6}),
    ets:insert(Tab, {#{camembert=>cabécou},7}),
    ets:insert(Tab, {#{"hi"=>"hello","wazzup"=>"awesome","1337"=>"42"},8}),
    ets:insert(Tab, {#{"hi"=>"hello",#{"wazzup"=>3}=>"awesome","1337"=>"42"},9}),
    ets:insert(Tab, {#{"hi"=>"hello","wazzup"=>#{"awesome"=>3},"1337"=>"42"},10}),
    Is = lists:seq(1,100),
    M1 = maps:from_list([{I,I}||I <- Is]),
    M2 = maps:from_list([{I,"hi"}||I <- Is]),
    ets:insert(Tab, {M1,11}),
    ets:insert(Tab, {M2,12}),

    case ets:match_object(Tab, {{one, '_'}, '$0'}) of
	[{{one,5},5},{{one,4},4}] -> ok;
	[{{one,4},4},{{one,5},5}] -> ok;
	_ -> ct:fail("ets:match_object() returned something funny.")
    end,
    case ets:match_object(Tab, {{two, '$1'}, '$0'}) of
	[{{two,5},6},{{two,4},4}] -> ok;
	[{{two,4},4},{{two,5},6}] -> ok;
	_ -> ct:fail("ets:match_object() returned something funny.")
    end,
    case ets:match_object(Tab, {{two, '$9'}, '$4'}) of
	[{{two,5},6},{{two,4},4}] -> ok;
	[{{two,4},4},{{two,5},6}] -> ok;
	_ -> ct:fail("ets:match_object() returned something funny.")
    end,
    case ets:match_object(Tab, {{two, '$9'}, '$22'}) of
	[{{two,5},6},{{two,4},4}] -> ok;
	[{{two,4},4},{{two,5},6}] -> ok;
	_ -> ct:fail("ets:match_object() returned something funny.")
    end,

    %% Check that maps are inspected for variables.
    [{#{camembert:=cabécou},7}] = ets:match_object(Tab, {#{camembert=>'_'},7}),

    [{#{"hi":="hello",#{"wazzup"=>3}:="awesome","1337":="42"},9}] =
        ets:match_object(Tab, {#{#{"wazzup"=>3}=>"awesome","hi"=>"hello","1337"=>"42"},9}),
    [{#{"hi":="hello",#{"wazzup"=>3}:="awesome","1337":="42"},9}] =
        ets:match_object(Tab, {#{#{"wazzup"=>3}=>"awesome","hi"=>"hello","1337"=>'_'},'_'}),
    [{#{"hi":="hello","wazzup":=#{"awesome":=3},"1337":="42"},10}] =
        ets:match_object(Tab, {#{"wazzup"=>'_',"hi"=>'_',"1337"=>'_'},10}),

    %% multiple patterns
    Pat = {{#{#{"wazzup"=>3}=>"awesome","hi"=>"hello","1337"=>'_'},'$1'},[{is_integer,'$1'}],['$_']},
    [{#{"hi":="hello",#{"wazzup"=>3}:="awesome","1337":="42"},9}] =
        ets:select(Tab, [Pat,Pat,Pat,Pat]),
    case ets:match_object(Tab, {#{"hi"=>"hello","wazzup"=>'_',"1337"=>"42"},'_'}) of
        [{#{"1337" := "42","hi" := "hello","wazzup" := "awesome"},8},
         {#{"1337" := "42","hi" := "hello","wazzup" := #{"awesome" := 3}},10}] -> ok;
        [{#{"1337" := "42","hi" := "hello","wazzup" := #{"awesome" := 3}},10},
         {#{"1337" := "42","hi" := "hello","wazzup" := "awesome"},8}] -> ok;
        _ -> ct:fail("ets:match_object() returned something funny.")
    end,
    case ets:match_object(Tab, {#{"hi"=>'_'},'_'}) of
        [{#{"1337":="42", "hi":="hello"},_},
         {#{"1337":="42", "hi":="hello"},_},
         {#{"1337":="42", "hi":="hello"},_}] -> ok;
        _ -> ct:fail("ets:match_object() returned something funny.")
    end,

    %% match large maps
    [{#{1:=1,2:=2,99:=99,100:=100},11}] = ets:match_object(Tab, {M1,11}),
    [{#{1:="hi",2:="hi",99:="hi",100:="hi"},12}] = ets:match_object(Tab, {M2,12}),
    case ets:match_object(Tab, {#{1=>'_',2=>'_'},'_'}) of
        %% only match a part of the map
        [{#{1:=1,5:=5,99:=99,100:=100},11},{#{1:="hi",6:="hi",99:="hi"},12}] -> ok;
        [{#{1:="hi",2:="hi",59:="hi"},12},{#{1:=1,2:=2,39:=39,100:=100},11}] -> ok;
        _ -> ct:fail("ets:match_object() returned something funny.")
    end,
    case ets:match_object(Tab, {maps:from_list([{I,'_'}||I<-Is]),'_'}) of
        %% only match a part of the map
        [{#{1:=1,5:=5,99:=99,100:=100},11},{#{1:="hi",6:="hi",99:="hi"},12}] -> ok;
        [{#{1:="hi",2:="hi",59:="hi"},12},{#{1:=1,2:=2,39:=39,100:=100},11}] -> ok;
        _ -> ct:fail("ets:match_object() returned something funny.")
    end,
    {'EXIT',{badarg,_}} = (catch ets:match_object(Tab, {#{'$1'=>'_'},7})),
    Mve = maps:from_list([{list_to_atom([$$|integer_to_list(I)]),'_'}||I<-Is]),
    {'EXIT',{badarg,_}} = (catch ets:match_object(Tab, {Mve,11})),

    %% Check that unsuccessful match returns an empty list.
    [] = ets:match_object(Tab, {{three,'$0'}, '$92'}),
    %% Check that '$0' equals '_'.
    Len = length(ets:match_object(Tab, '$0')),
    Len = length(ets:match_object(Tab, '_')),
    if Len > 4 -> ok end,
    true = ets:delete(Tab),
    verify_etsmem(EtsMem).

%% Tests that db_match_object does not generate a `badarg' when
%% resuming a search with no previous matches.
match_object2(Config) when is_list(Config) ->
    repeat_for_opts_all_table_types(fun match_object2_do/1).

match_object2_do(Opts) ->
    EtsMem = etsmem(),
    KeyRange = 13005,
    Tab = ets_new(foo, [{keypos, 2} | Opts], KeyRange),
    fill_tab2(Tab, 0, KeyRange),     % match_db_object does 1000
						% elements per pass, might
						% change in the future.
    [] = ets:match_object(Tab, {hej, '$1'}),
    ets:delete(Tab),
    verify_etsmem(EtsMem).

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%% OTP-3319. Test tab2list.
tab2list(Config) when is_list(Config) ->
    repeat_for_all_ord_set_table_types(
      fun(Opts) ->
              EtsMem = etsmem(),
              Tab = make_table(foo,
                               Opts,
                               [{a,b}, {c,b}, {b,b}, {a,c}]),
              [{a,c},{b,b},{c,b}] = ets:tab2list(Tab),
              true = ets:delete(Tab),
              verify_etsmem(EtsMem)
      end).

%% Simple general small test.  If this fails, ets is in really bad
%% shape.
misc1(Config) when is_list(Config) ->
    repeat_for_opts_all_table_types(fun misc1_do/1).

misc1_do(Opts) ->
    EtsMem = etsmem(),
    Tab = ets_new(foo,Opts),
    true = lists:member(Tab,ets:all()),
    ets:delete(Tab),
    false = lists:member(Tab,ets:all()),
    case catch ets:delete(Tab) of
	{'EXIT',_Reason} ->
	    verify_etsmem(EtsMem);
	true ->
	    ct:fail("Delete of nonexisting table returned `true'.")
    end,
    ok.

%% Check the safe_fixtable function.
safe_fixtable(Config) when is_list(Config) ->
    repeat_for_opts_all_table_types(fun safe_fixtable_do/1).

safe_fixtable_do(Opts) ->
    EtsMem = etsmem(),
    Tab = ets_new(foo, Opts),
    fill_tab(Tab, foobar),
    true = ets:safe_fixtable(Tab, true),
    receive after 1 -> ok end,
    true = ets:safe_fixtable(Tab, false),
    false = ets:info(Tab,safe_fixed_monotonic_time),
    false = ets:info(Tab,safe_fixed),
    SysBefore = erlang:timestamp(),
    MonBefore = erlang:monotonic_time(),
    true = ets:safe_fixtable(Tab, true),
    MonAfter = erlang:monotonic_time(),
    SysAfter = erlang:timestamp(),
    Self = self(),
    {FixMonTime,[{Self,1}]} = ets:info(Tab,safe_fixed_monotonic_time),
    {FixSysTime,[{Self,1}]} = ets:info(Tab,safe_fixed),
    true = is_integer(FixMonTime),
    true = MonBefore =< FixMonTime,
    true = FixMonTime =< MonAfter,
    {FstMs,FstS,FstUs} = FixSysTime,
    true = is_integer(FstMs),
    true = is_integer(FstS),
    true = is_integer(FstUs),
    case erlang:system_info(time_warp_mode) of
	no_time_warp ->
	    true = timer:now_diff(FixSysTime, SysBefore) >= 0,
	    true = timer:now_diff(SysAfter, FixSysTime) >= 0;
	_ ->
	    %% ets:info(Tab,safe_fixed) not timewarp safe...
	    ignore
    end,
    %% Test that an unjustified 'unfix' is a no-op.
    {Pid,MRef} = my_spawn_monitor(fun() -> true = ets:safe_fixtable(Tab,false) end),
    {'DOWN', MRef, process, Pid, normal} = receive M -> M end,
    true = ets:info(Tab,fixed),
    {FixMonTime,[{Self,1}]} = ets:info(Tab,safe_fixed_monotonic_time),
    {FixSysTime,[{Self,1}]} = ets:info(Tab,safe_fixed),
    %% badarg's
    {'EXIT', {badarg, _}} = (catch ets:safe_fixtable(Tab, foobar)),
    true = ets:info(Tab,fixed),
    true = ets:safe_fixtable(Tab, false),
    false = ets:info(Tab,fixed),
    {'EXIT', {badarg, _}} = (catch ets:safe_fixtable(Tab, foobar)),
    false = ets:info(Tab,fixed),
    ets:delete(Tab),
    case catch ets:safe_fixtable(Tab, true) of
	{'EXIT', _Reason} ->
	    verify_etsmem(EtsMem);
	_ ->
	    ct:fail("Fixtable on nonexisting table returned `true'")
    end,
    ok.

-define(ets_info(Tab,Item,SlavePid), ets_info(Tab, Item, SlavePid, ?LINE)).

%% Tests ets:info result for required tuples.
info(Config) when is_list(Config) ->
    repeat_for_opts(fun info_do/1,
                    [[void, set, bag, duplicate_bag, ordered_set],
                     [void, private, protected, public],
                     write_concurrency, read_concurrency, compressed]),

    undefined = ets:info(non_existing_table_xxyy),
    undefined = ets:info(non_existing_table_xxyy,type),
    undefined = ets:info(non_existing_table_xxyy,node),
    undefined = ets:info(non_existing_table_xxyy,named_table),
    undefined = ets:info(non_existing_table_xxyy,safe_fixed_monotonic_time),
    undefined = ets:info(non_existing_table_xxyy,safe_fixed),

    {'EXIT',{badarg,_}} = (catch ets:info(42)),
    {'EXIT',{badarg,_}} = (catch ets:info(42, type)),
    {'EXIT',{badarg,_}} = (catch ets:info(make_ref())),
    {'EXIT',{badarg,_}} = (catch ets:info(make_ref(), type)),

    ok.

info_do(Opts) ->
    EtsMem = etsmem(),
    TableType = lists:foldl(
                  fun(Item, Curr) -> 
                          case Item of
                              set -> set;
                              ordered_set -> ordered_set;
                              cat_ord_set -> ordered_set;
                              stim_cat_ord_set -> ordered_set;
                              bag -> bag;
                              duplicate_bag -> duplicate_bag; 
                              _ -> Curr
                          end
                  end, set, Opts),
    PublicOrCurr =
        fun(Curr) ->
                case lists:member({write_concurrency, false}, Opts) or
                    lists:member(private, Opts) or
                    lists:member(protected, Opts) of
                    true -> Curr;
                    false -> public
                end
        end,
    Protection = lists:foldl(
                   fun(Item, Curr) ->
                           case Item of
                               public -> public;
                               protected -> protected;
                               private -> private;
                               cat_ord_set -> PublicOrCurr(Curr); %% Special items
                               stim_cat_ord_set -> PublicOrCurr(Curr);
                               _ -> Curr
                           end
                   end, protected, Opts),
    MeMyselfI=self(),
    ThisNode=node(),
    Tab = ets_new(foobar, [{keypos, 2} | Opts]),

    %% Start slave to also do ets:info from a process not owning the table.
    SlavePid = spawn_link(fun Slave() ->
                                  receive
                                      {Master, Item} ->
                                          Master ! {self(), Item, ets:info(Tab, Item)}
                                  end,
                                  Slave()
                          end),

    %% Note: ets:info/1 used to return a tuple, but from R11B onwards it
    %% returns a list.
    Res = ets:info(Tab),
    {value, {memory, _Mem}} = lists:keysearch(memory, 1, Res),
    {value, {owner, MeMyselfI}} = lists:keysearch(owner, 1, Res),
    {value, {name, foobar}} = lists:keysearch(name, 1, Res),
    {value, {size, 0}} = lists:keysearch(size, 1, Res),
    {value, {node, ThisNode}} = lists:keysearch(node, 1, Res),
    {value, {named_table, false}} = lists:keysearch(named_table, 1, Res),
    {value, {type, TableType}} = lists:keysearch(type, 1, Res),
    {value, {keypos, 2}} = lists:keysearch(keypos, 1, Res),
    {value, {protection, Protection}} =
	lists:keysearch(protection, 1, Res),
    {value, {id, Tab}} = lists:keysearch(id, 1, Res),
    {value, {decentralized_counters, _DecentralizedCtrs}} =
        lists:keysearch(decentralized_counters, 1, Res),

    %% Test 'binary'
    [] = ?ets_info(Tab, binary, SlavePid),
    BinSz = 100,
    RefcBin = list_to_binary(lists:seq(1,BinSz)),
    ets:insert(Tab, {RefcBin,key}),
    [{BinPtr,BinSz,2}] = ?ets_info(Tab,binary, SlavePid),
    ets:insert(Tab, {RefcBin,key2}),
    [{BinPtr,BinSz,3}, {BinPtr,BinSz,3}] = ?ets_info(Tab,binary,SlavePid),
    ets:delete(Tab, key),
    [{BinPtr,BinSz,2}] = ?ets_info(Tab,binary, SlavePid),
    case TableType of
        ordered_set ->
            ets:delete(Tab, key2);
        _ ->
            ets:safe_fixtable(Tab, true),
            ets:delete(Tab, key2),
            [{BinPtr,BinSz,2}] = ?ets_info(Tab,binary, SlavePid),
            ets:safe_fixtable(Tab, false)
    end,
    [] = ?ets_info(Tab,binary, SlavePid),
    RefcBin = id(RefcBin), % keep alive

    unlink(SlavePid),
    exit(SlavePid,kill),

    true = ets:delete(Tab),
    verify_etsmem(EtsMem).

ets_info(Tab, Item, SlavePid, _Line) ->
    R = ets:info(Tab, Item),
    %%io:format("~p: ets:info(~p) -> ~p\n", [_Line, Item, R]),
    SlavePid ! {self(), Item},
    {SlavePid, Item, R} = receive M -> M end,
    R.



info_binary_stress(_Config) ->
    repeat_for_opts(fun info_binary_stress_do/1,
                    [[set,bag,duplicate_bag,ordered_set],
                     compressed]).

info_binary_stress_do(Opts) ->
    Tab = ets_new(info_binary_stress, [public, {write_concurrency,true} | Opts]),

    KeyRange = 1000,
    ValueRange = 3,
    RefcBin = list_to_binary(lists:seq(1,100)),
    InitF = fun (_) -> #{insert => 0, delete => 0, delete_object => 0}
            end,
    ExecF = fun (Counters) ->
                    Key = rand:uniform(KeyRange),
                    Value = rand:uniform(ValueRange),
                    Op = element(rand:uniform(4),{insert,insert,delete,delete_object}),
                    case Op of
                        insert ->
                            ets:insert(Tab, {Key,Value,RefcBin});
                        delete ->
                            ets:delete(Tab, Key);
                        delete_object ->
                            ets:delete_object(Tab, {Key,Value,RefcBin})
                    end,
                    Acc = incr_counter(Op, Counters),

                    receive stop ->
                                [end_of_work | Acc]
                    after 0 ->
                            Acc
                    end
            end,
    FiniF = fun (Acc) -> Acc end,
    Pids = run_sched_workers(InitF, ExecF, FiniF, infinite),
    timer:send_after(500, stop),

    Rounds = fun Loop(N, Fix) ->
                     ets:info(Tab, binary),
                     ets:safe_fixtable(Tab, Fix),
                     receive
                         stop ->
                             ets:safe_fixtable(Tab, false),
                             false = ets:info(Tab, fixed),
                             N
                     after 0 ->
                             Loop(N+1, not Fix)
                     end
             end (1, true),
    [P ! stop || P <- Pids],
    Results = wait_pids(Pids),
    Size = ets:info(Tab,size),
    io:format("Ops = ~p\n", [maps_sum(Results)]),
    io:format("Size = ~p\n", [Size]),
    io:format("Stats = ~p\n", [ets:info(Tab,stats)]),
    io:format("Rounds = ~p\n", [Rounds]),
    Size = length(ets:info(Tab, binary)),

    ets:delete_all_objects(Tab),
    [] = ets:info(Tab, binary),
    true = ets:delete(Tab),
    ok.


size_loop(_T, 0, _, _) ->
    ok;
size_loop(T, I, PrevSize, WhatToTest) ->
    Size = ets:info(T, WhatToTest),
    case Size < PrevSize of
        true ->
            io:format("Bad ets:info/2 (got ~p expected >=~p)",
                      [Size, PrevSize]),
            ct:fail("Bad ets:info/2)");
        _ -> ok
    end,
    size_loop(T, I -1, Size, WhatToTest).

add_loop(_T, 0) ->
    ok;
add_loop(T, I) ->
    ets:insert(T, {I}),
    add_loop(T, I -1).


test_table_counter_concurrency(WhatToTest, TableOptions) ->
    IntStatePrevOn =
        erts_debug:set_internal_state(available_internal_state, true),
    ItemsToAdd = 1000000,
    SizeLoopSize = 1000,
    T = ets:new(k, TableOptions),
    case lists:member(ordered_set, TableOptions) of
        true ->
            erts_debug:set_internal_state(ets_debug_random_split_join, {T, false});
        false -> ok
    end,
    0 = ets:info(T, size),
    P = self(),
    SpawnedSizeProcs =
        [spawn_link(fun() ->
                            size_loop(T, SizeLoopSize, 0, WhatToTest),
                            P ! done
                    end)
         || _ <- lists:seq(1, 6)],
    spawn_link(fun() ->
                       add_loop(T, ItemsToAdd),
                       P ! done_add
               end),
    [receive
         done -> ok;
         done_add -> ok
     end
     || _ <- [ok|SpawnedSizeProcs]],
    case WhatToTest =:= size of
        true ->
            ItemsToAdd = ets:info(T, size);
        _ ->
            ok
    end,
    erts_debug:set_internal_state(available_internal_state, IntStatePrevOn),
    ok.

test_table_size_concurrency(Config) when is_list(Config) ->
    case erlang:system_info(schedulers) of
        1 -> {skip,"Only valid on smp > 1 systems"};
        _ ->
            BaseOptions = [public, {write_concurrency, true}],
            test_table_counter_concurrency(size, [set | BaseOptions]),
            test_table_counter_concurrency(size, [ordered_set | BaseOptions])
    end.

test_table_memory_concurrency(Config) when is_list(Config) ->
    case erlang:system_info(schedulers) of
        1 -> {skip,"Only valid on smp > 1 systems"};
        _ ->
            BaseOptions = [public, {write_concurrency, true}],
            test_table_counter_concurrency(memory, [set | BaseOptions]),
            test_table_counter_concurrency(memory, [ordered_set | BaseOptions])
    end.

%% Tests that calling the ets:delete operation on a table T with
%% decentralized counters works while ets:info(T, size) operations are
%% active
test_delete_table_while_size_snapshot(Config) when is_list(Config) ->
    %% Run test case in a slave node as other test suites in stdlib
    %% depend on that pids are ordered in creation order which is no
    %% longer the case when many processes have been started before
    Node = start_slave(),
    [ok = rpc:call(Node,
                   ?MODULE,
                   test_delete_table_while_size_snapshot_helper,
                   [TableType])
     || TableType <- [set, ordered_set]],
    test_server:stop_node(Node),
    ok.

test_delete_table_while_size_snapshot_helper(TableType) ->
    TopParent = self(),
    repeat_par(
      fun() ->
              Table = ets:new(t, [public, TableType,
                                  {decentralized_counters, true},
                                  {write_concurrency, true}]),
              Parent = self(),
              NrOfSizeProcs = 100,
              Pids = [ spawn(fun()-> size_process(Table, Parent) end)
                       || _ <- lists:seq(1, NrOfSizeProcs)],
              timer:sleep(1),
              ets:delete(Table),
              [receive
                   table_gone ->  ok;
                   Problem -> TopParent ! Problem
               end || _ <- Pids]
      end,
      100*erlang:system_info(schedulers_online)),
    receive
        Problem -> throw(Problem)
    after 0 -> ok
    end.

size_process(Table, Parent) ->
    try ets:info(Table, size) of
        N when is_integer(N) ->
            size_process(Table, Parent);
        undefined -> Parent ! table_gone;
        E -> Parent ! {got_unexpected, E}
    catch
        E -> Parent ! {got_unexpected_exception, E}
    end.

start_slave() ->
    MicroSecs = erlang:monotonic_time(),
    Name = "ets_" ++ integer_to_list(MicroSecs),
    Pa = filename:dirname(code:which(?MODULE)),
    {ok, Node} = test_server:start_node(list_to_atom(Name), slave, [{args, "-pa " ++ Pa}]),
    Node.

repeat_par(FunToRepeat, NrOfTimes) ->
    repeat_par_help(FunToRepeat, NrOfTimes, NrOfTimes).

repeat_par_help(_FunToRepeat, 0, OrgNrOfTimes) ->
    repeat(fun()-> receive done -> ok end end, OrgNrOfTimes);
repeat_par_help(FunToRepeat, NrOfTimes, OrgNrOfTimes) ->
    Parent = self(),
    case NrOfTimes rem 5 of
        0 -> timer:sleep(1);
        _ -> ok
    end,
    spawn(fun()->
                  FunToRepeat(),
                  Parent ! done
          end),
    repeat_par_help(FunToRepeat, NrOfTimes-1, OrgNrOfTimes).

test_decentralized_counters_setting(Config) when is_list(Config) ->
    case erlang:system_info(schedulers) of
        1 -> {skip,"Only relevant when the number of shedulers > 1"};
        _ -> EtsMem = etsmem(),
             do_test_decentralized_counters_setting(set),
             do_test_decentralized_counters_setting(ordered_set),
             do_test_decentralized_counters_default_setting(),
             verify_etsmem(EtsMem)
    end.

do_test_decentralized_counters_setting(TableType) ->
    wait_for_memory_deallocations(),
    FlxCtrMemUsage = erts_debug:get_internal_state(flxctr_memory_usage),
    lists:foreach(
      fun(OptList) ->
              T1 = ets:new(t1, [public, TableType] ++ OptList ++ [TableType]),
              check_decentralized_counters(T1, false, FlxCtrMemUsage),
              ets:delete(T1)
      end,
      [[{write_concurrency, false}],
       [{write_concurrency, true}, {decentralized_counters, false}]]),
    lists:foreach(
      fun(OptList) ->
              T1 = ets:new(t1, [public,
                                TableType,
                                {write_concurrency, true}] ++ OptList ++ [TableType]),
              check_decentralized_counters(T1, true, FlxCtrMemUsage),
              ets:delete(T1),
              wait_for_memory_deallocations(),
              FlxCtrMemUsage = erts_debug:get_internal_state(flxctr_memory_usage)
      end,
      [[{decentralized_counters, true}]]),
    ok.

do_test_decentralized_counters_default_setting() ->
    wait_for_memory_deallocations(),
    FlxCtrMemUsage = erts_debug:get_internal_state(flxctr_memory_usage),
    Set = ets:new(t1, [public, {write_concurrency, true}]),
    check_decentralized_counters(Set, false, FlxCtrMemUsage),
    ets:delete(Set),
    Set2 = ets:new(t1, [public, set, {write_concurrency, true}]),
    check_decentralized_counters(Set2, false, FlxCtrMemUsage),
    ets:delete(Set2),
    OrdSet = ets:new(t1, [public, ordered_set, {write_concurrency, true}]),
    check_decentralized_counters(OrdSet, true, FlxCtrMemUsage),
    ets:delete(OrdSet),
    ok.

check_decentralized_counters(T, ExpectedState, InitMemUsage) ->
    case {ExpectedState, erts_debug:get_internal_state(flxctr_memory_usage)} of
        {false, notsup} -> ok;
        {false, X} -> InitMemUsage = X;
        {true, notsup} -> ok;
        {true, X} when X > InitMemUsage -> ok;
        {true, _} -> ct:fail("Decentralized counter not used.")
    end,
    ExpectedState = ets:info(T, decentralized_counters).

%% Test various duplicate_bags stuff.
dups(Config) when is_list(Config) ->
    repeat_for_opts(fun dups_do/1).

dups_do(Opts) ->
    EtsMem = etsmem(),
    T = make_table(funky,
		   [duplicate_bag | Opts],
		   [{1, 2}, {1, 2}]),
    2 = length(ets:tab2list(T)),
    ets:delete(T, 1),
    [] = ets:lookup(T, 1),

    ets:insert(T, {1, 2, 2}),
    ets:insert(T, {1, 2, 4}),
    ets:insert(T, {1, 2, 2}),
    ets:insert(T, {1, 2, 2}),
    ets:insert(T, {1, 2, 4}),

    5 = length(ets:tab2list(T)),

    5 = length(ets:match(T, {'$1', 2, '$2'})),
    3 = length(ets:match(T, {'_', '$1', '$1'})),
    ets:match_delete(T, {'_', '$1', '$1'}),
    0 = length(ets:match(T, {'_', '$1', '$1'})),
    ets:delete(T),
    verify_etsmem(EtsMem).

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%% Test the ets:tab2file function on an empty ets table.
tab2file(Config) when is_list(Config) ->
    FName = filename:join([proplists:get_value(priv_dir, Config),"tab2file_case"]),
    tab2file_do(FName, [], set),
    tab2file_do(FName, [], ordered_set),
    tab2file_do(FName, [], cat_ord_set),
    tab2file_do(FName, [], stim_cat_ord_set),
    tab2file_do(FName, [{sync,true}], set),
    tab2file_do(FName, [{sync,false}], set),
    {'EXIT',{{badmatch,{error,_}},_}} = (catch tab2file_do(FName, [{sync,yes}], set)),
    {'EXIT',{{badmatch,{error,_}},_}} = (catch tab2file_do(FName, [sync], set)),
    ok.

tab2file_do(FName, Opts, TableType) ->
    %% Write an empty ets table to a file, read back and check properties.
    Tab = ets_new(ets_SUITE_foo_tab, [named_table, TableType, public,
				      {keypos, 2},
				      compressed,
				      {write_concurrency,true},
				      {read_concurrency,true}]),
    ActualTableType =
        case TableType of
            cat_ord_set -> ordered_set;
            stim_cat_ord_set -> ordered_set;
            _ -> TableType
        end,
    catch file:delete(FName),
    Res = ets:tab2file(Tab, FName, Opts),
    true = ets:delete(Tab),
    ok = Res,
    %%
    EtsMem = etsmem(),
    {ok, Tab2} = ets:file2tab(FName),
    public = ets:info(Tab2, protection),
    true = ets:info(Tab2, named_table),
    2 = ets:info(Tab2, keypos),
    ActualTableType = ets:info(Tab2, type),
    true = ets:info(Tab2, compressed),
    Smp = erlang:system_info(smp_support),
    Smp = ets:info(Tab2, read_concurrency),
    Smp = ets:info(Tab2, write_concurrency) orelse erlang:system_info(schedulers) == 1,
    true = ets:delete(Tab2),
    verify_etsmem(EtsMem).


%% Check the ets:tab2file function on a filled set/bag type ets table.
tab2file2(Config) when is_list(Config) ->
    repeat_for_opts(fun(Opts) ->
                            tab2file2_do(Opts, Config)
                    end, [[stim_cat_ord_set,cat_ord_set,set,bag],compressed]).

tab2file2_do(Opts, Config) ->
    EtsMem = etsmem(),
    KeyRange = 10000,
    Tab = ets_new(ets_SUITE_foo_tab, [named_table, private, {keypos, 2} | Opts],
                  KeyRange),
    FName = filename:join([proplists:get_value(priv_dir, Config),"tab2file2_case"]),
    ok = fill_tab2(Tab, 0, KeyRange),   % Fill up the table (grucho mucho!)
    Len = length(ets:tab2list(Tab)),
    Mem = ets:info(Tab, memory),
    Type = ets:info(Tab, type),
    %%io:format("org tab: ~p\n",[ets:info(Tab)]),
    ok = ets:tab2file(Tab, FName),
    true = ets:delete(Tab),

    EtsMem4 = etsmem(),

    {ok, Tab2} = ets:file2tab(FName),
    %%io:format("loaded tab: ~p\n",[ets:info(Tab2)]),
    private = ets:info(Tab2, protection),
    true = ets:info(Tab2, named_table),
    2 = ets:info(Tab2, keypos),
    Type = ets:info(Tab2, type),
    Len = length(ets:tab2list(Tab2)),
    Mem = ets:info(Tab2, memory),
    true = ets:delete(Tab2),
    io:format("Between = ~p\n", [EtsMem4]),
    verify_etsmem(EtsMem).

-define(test_list, [8,5,4,1,58,125,255, 250, 245, 240, 235,
		    230, Num rem 255, 255, 125, 130, 135, 140, 145,
		    150, 134, 12, 54, Val rem 255, 12, 3, 6, 9, 126]).
-define(big_test_list, [Num rem 256|lists:seq(1, 66)]).
-define(test_integer, 2846287468+Num).
-define(test_float, 187263.18236-Val).
-define(test_atom, some_crazy_atom).
-define(test_tuple, {just, 'Some', 'Tuple', 1, [list, item], Val+Num}).

%% Insert different datatypes into a ets table.
fill_tab2(_Tab, _Val, 0) ->
    ok;
fill_tab2(Tab, Val, Num) ->
    Item =
	case Num rem 10 of
	    0 -> "String";
	    1 -> ?test_atom;
	    2 -> ?test_tuple;
	    3 -> ?test_integer;
	    4 -> ?test_float;
	    5 -> list_to_binary(?test_list); %Heap binary
	    6 -> list_to_binary(?big_test_list); %Refc binary
	    7 -> make_sub_binary(?test_list, Num); %Sub binary
	    8 -> ?test_list;
	    9 -> fun(X) -> {Tab,Val,X*Num} end
	end,
    true=ets:insert(Tab, {Item, Val}),
    fill_tab2(Tab, Val+1, Num-1),
    ok.

%% Test verification of tables with object count extended_info.
tabfile_ext1(Config) when is_list(Config) ->
    repeat_for_opts_all_set_table_types(fun(Opts) -> tabfile_ext1_do(Opts, Config) end).

tabfile_ext1_do(Opts,Config) ->
    FName = filename:join([proplists:get_value(priv_dir, Config),"nisse.dat"]),
    FName2 = filename:join([proplists:get_value(priv_dir, Config),"countflip.dat"]),
    KeyRange = 10,
    L = lists:seq(1,KeyRange),
    T = ets_new(x,Opts,KeyRange),
    Name = make_ref(),
    [ets:insert(T,{X,integer_to_list(X)}) || X <- L],
    ok = ets:tab2file(T,FName,[{extended_info,[object_count]}]),
    true = lists:sort(ets:tab2list(T)) =:= 
	lists:sort(ets:tab2list(element(2,ets:file2tab(FName)))),
    true = lists:sort(ets:tab2list(T)) =:= 
	lists:sort(ets:tab2list(
		     element(2,ets:file2tab(FName,[{verify,true}])))),
    {ok,Name} = disk_log:open([{name,Name},{file,FName}]),
    {_,[H0|T0]} = disk_log:chunk(Name,start),
    disk_log:close(Name),
    LH0=tuple_to_list(H0),
    {value,{size,N}}=lists:keysearch(size,1,LH0),
    NewLH0 = lists:keyreplace(size,1,LH0,{size,N-1}),
    NewH0 = list_to_tuple(NewLH0),
    NewT0=lists:keydelete(8,1,T0),
    file:delete(FName2),
    disk_log:open([{name,Name},{file,FName2},{mode,read_write}]),
    disk_log:log_terms(Name,[NewH0|NewT0]),
    disk_log:close(Name),
    9 = length(ets:tab2list(element(2,ets:file2tab(FName2)))),
    {error,invalid_object_count} = ets:file2tab(FName2,[{verify,true}]),
    {ok, _} = ets:tabfile_info(FName2),
    {ok, _} = ets:tabfile_info(FName),
    file:delete(FName),
    file:delete(FName2),
    ok.


%% Test verification of tables with md5sum extended_info.
tabfile_ext2(Config) when is_list(Config) ->
    repeat_for_opts_all_set_table_types(fun(Opts) -> tabfile_ext2_do(Opts,Config) end).

tabfile_ext2_do(Opts,Config) ->
    FName = filename:join([proplists:get_value(priv_dir, Config),"olle.dat"]),
    FName2 = filename:join([proplists:get_value(priv_dir, Config),"bitflip.dat"]),
    KeyRange = 10,
    L = lists:seq(1, KeyRange),
    T = ets_new(x, Opts, KeyRange),
    Name = make_ref(),
    [ets:insert(T,{X,integer_to_list(X)}) || X <- L],
    ok = ets:tab2file(T,FName,[{extended_info,[md5sum]}]),
    true = lists:sort(ets:tab2list(T)) =:=
	lists:sort(ets:tab2list(element(2,ets:file2tab(FName)))),
    true = lists:sort(ets:tab2list(T)) =:=
	lists:sort(ets:tab2list(
		     element(2,ets:file2tab(FName,[{verify,true}])))),
    {ok, Name} = disk_log:open([{name,Name},{file,FName}]),
    {_,[H1|T1]} = disk_log:chunk(Name,start),
    disk_log:close(Name),
    NewT1=lists:keyreplace(8,1,T1,{8,"9"}),
    file:delete(FName2),
    disk_log:open([{name,Name},{file,FName2},{mode,read_write}]),
    disk_log:log_terms(Name,[H1|NewT1]),
    disk_log:close(Name),
    {value,{8,"9"}} = lists:keysearch(8,1,
				      ets:tab2list(
					element(2,ets:file2tab(FName2)))),
    {error,checksum_error} = ets:file2tab(FName2,[{verify,true}]),
    {value,{extended_info,[md5sum]}} =
	lists:keysearch(extended_info,1,element(2,ets:tabfile_info(FName2))),
    {value,{extended_info,[md5sum]}} =
	lists:keysearch(extended_info,1,element(2,ets:tabfile_info(FName))),
    file:delete(FName),
    file:delete(FName2),
    ok.

%% Test verification of (named) tables without extended info.
tabfile_ext3(Config) when is_list(Config) ->
    repeat_for_all_set_table_types(
      fun(Opts) ->
              FName = filename:join([proplists:get_value(priv_dir, Config),"namn.dat"]),
              FName2 = filename:join([proplists:get_value(priv_dir, Config),"ncountflip.dat"]),
              L = lists:seq(1,10),
              Name = make_ref(),
              ?MODULE = ets_new(?MODULE,[named_table|Opts]),
              [ets:insert(?MODULE,{X,integer_to_list(X)}) || X <- L],
              ets:tab2file(?MODULE,FName),
              {error,cannot_create_table} = ets:file2tab(FName),
              true = ets:delete(?MODULE),
              {ok,?MODULE} = ets:file2tab(FName),
              true = ets:delete(?MODULE),
              disk_log:open([{name,Name},{file,FName}]),
              {_,[H2|T2]} = disk_log:chunk(Name,start),
              disk_log:close(Name),
              NewT2=lists:keydelete(8,1,T2),
              file:delete(FName2),
              disk_log:open([{name,Name},{file,FName2},{mode,read_write}]),
              disk_log:log_terms(Name,[H2|NewT2]),
              disk_log:close(Name),
              9 = length(ets:tab2list(element(2,ets:file2tab(FName2)))),
              true = ets:delete(?MODULE),
              {error,invalid_object_count} = ets:file2tab(FName2,[{verify,true}]),
              {'EXIT',_} = (catch ets:delete(?MODULE)),
              {ok,_} = ets:tabfile_info(FName2),
              {ok,_} = ets:tabfile_info(FName),
              file:delete(FName),
              file:delete(FName2)
      end),
    ok.

%% Tests verification of large table with md5 sum.
tabfile_ext4(Config) when is_list(Config) ->
    repeat_for_all_set_table_types(
      fun(Opts) ->
              FName = filename:join([proplists:get_value(priv_dir, Config),"bauta.dat"]),
              LL = lists:seq(1,10000),
              TL = ets_new(x,Opts),
              Name2 = make_ref(),
              [ets:insert(TL,{X,integer_to_list(X)}) || X <- LL],
              ok = ets:tab2file(TL,FName,[{extended_info,[md5sum]}]),
              {ok, Name2} = disk_log:open([{name, Name2}, {file, FName},
                                           {mode, read_only}]),
              {C,[_|_]} = disk_log:chunk(Name2,start),
              {_,[_|_]} = disk_log:chunk(Name2,C),
              disk_log:close(Name2),
              true = lists:sort(ets:tab2list(TL)) =:=
                  lists:sort(ets:tab2list(element(2,ets:file2tab(FName)))),
              Res = [begin
                         {ok,FD} = file:open(FName,[binary,read,write]),
                         {ok, Bin} = file:pread(FD,0,1000),
                         <<B1:N/binary,Ch:8,B2/binary>> = Bin,
                         Ch2 = (Ch + 1) rem 255,
                         Bin2 = <<B1/binary,Ch2:8,B2/binary>>,
                         ok = file:pwrite(FD,0,Bin2),
                         ok = file:close(FD),
                         X = case ets:file2tab(FName) of
                                 {ok,TL2} ->
                                     true = lists:sort(ets:tab2list(TL)) =/=
                                         lists:sort(ets:tab2list(TL2));
                                 _ ->
                                     totally_broken
                             end,
                         {error,Y} = ets:file2tab(FName,[{verify,true}]),
                         ets:tab2file(TL,FName,[{extended_info,[md5sum]}]),
                         {X,Y}
                     end || N <- lists:seq(700,800)],
              io:format("~p~n",[Res]),
              file:delete(FName)
      end),
    ok.

%% Test that no disk_log is left open when file has been corrupted.
badfile(Config) when is_list(Config) ->
    PrivDir = proplists:get_value(priv_dir,Config),
    File = filename:join(PrivDir, "badfile"),
    _ = file:delete(File),
    T = ets:new(table, []),
    true = ets:insert(T, [{a,1},{b,2}]),
    ok = ets:tab2file(T, File, []),
    true = ets:delete(T),
    [H0 | Ts ] = get_all_terms(l, File),
    H1 = tuple_to_list(H0),
    H2 = [{K,V} || {K,V} <- H1, K =/= protection],
    H = list_to_tuple(H2),
    ok = file:delete(File),
    write_terms(l, File, [H | Ts]),
    %% All mandatory keys are no longer members of the header
    {error, badfile} = ets:file2tab(File),
    {error, badfile} = ets:tabfile_info(File),
    file:delete(File),
    [] = disk_log:all(),
    ok.

get_all_terms(Log, File) ->
    {ok, Log} = disk_log:open([{name,Log},
                               {file, File},
                               {mode, read_only}]),
    Ts = get_all_terms(Log),
    ok = disk_log:close(Log),
    Ts.

get_all_terms(Log) ->
    get_all_terms1(Log, start, []).

get_all_terms1(Log, Cont, Res) ->
    case disk_log:chunk(Log, Cont) of
	{error, _R} ->
            throw(fel);
	{Cont2, Terms} ->
	    get_all_terms1(Log, Cont2, Res ++ Terms);
	eof ->
	    Res
    end.

write_terms(Log, File, Terms) ->
    {ok, Log} = disk_log:open([{name,Log},{file, File},{mode,read_write}]),
    ok = disk_log:log(Log, Terms),
    ok = disk_log:close(Log).

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

make_sub_binary(List, Num) when is_list(List) ->
    N = Num rem 23,
    Bin = list_to_binary([lists:seq(0, N)|List]),
    {_,B} = split_binary(Bin, N+1),
    B.


%% Lookup stuff like crazy...

%% Perform multiple lookups for every key in a large table.
heavy_lookup(Config) when is_list(Config) ->
    repeat_for_opts_all_set_table_types(fun heavy_lookup_do/1).

heavy_lookup_do(Opts) ->
    EtsMem = etsmem(),
    KeyRange = 7000,
    Tab = ets_new(foobar_table, [{keypos, 2} | Opts], KeyRange),
    ok = fill_tab2(Tab, 0, KeyRange),
    _ = [do_lookup(Tab, KeyRange-1) || _ <- lists:seq(1, 50)],
    true = ets:delete(Tab),
    verify_etsmem(EtsMem).

do_lookup(_Tab, 0) -> ok;
do_lookup(Tab, N) ->
    case ets:lookup(Tab, N) of
	[] ->
	    io:format("Set #~p was reported as empty. Not valid.",
		      [N]),
	    exit('Invalid lookup');
	_ ->
	    do_lookup(Tab, N-1)
    end.

%% Perform multiple lookups for every element in a large table.
heavy_lookup_element(Config) when is_list(Config) ->
    repeat_for_opts_all_set_table_types(fun heavy_lookup_element_do/1).

heavy_lookup_element_do(Opts) ->
    EtsMem = etsmem(),
    KeyRange = 7000,
    Tab = ets_new(foobar_table, [{keypos, 2} | Opts], KeyRange),
    ok = fill_tab2(Tab, 0, KeyRange),
    %% lookup ALL elements 50 times
    Laps = 50 div syrup_factor(),
    _ = [do_lookup_element(Tab, KeyRange-1, 1) || _ <- lists:seq(1, Laps)],
    true = ets:delete(Tab),
    verify_etsmem(EtsMem).

do_lookup_element(_Tab, 0, _) -> ok;
do_lookup_element(Tab, N, M) ->
    case catch ets:lookup_element(Tab, N, M) of
	{'EXIT', {badarg, _}} ->
	    case M of
		1 -> ct:fail("Set #~p reported as empty. Not valid.",
			     [N]),
		     exit('Invalid lookup_element');
		_ -> do_lookup_element(Tab, N-1, 1)
	    end;
	_ -> do_lookup_element(Tab, N, M+1)
    end.


heavy_concurrent(Config) when is_list(Config) ->
    ct:timetrap({minutes,120}), %% valgrind needs a lot of time
    repeat_for_opts_all_set_table_types(fun do_heavy_concurrent/1).

do_heavy_concurrent(Opts) ->
    KeyRange = 10000,
    Laps = 10000 div syrup_factor(),
    EtsMem = etsmem(),
    Tab = ets_new(blupp, [public, {keypos, 2} | Opts], KeyRange),
    ok = fill_tab2(Tab, 0, KeyRange),
    Procs = lists:map(
	      fun (N) ->
		      my_spawn_link(
			fun () ->
				do_heavy_concurrent_proc(Tab, Laps, N)
			end)
	      end,
	      lists:seq(1, 500)),
    lists:foreach(fun (P) ->
			  M = erlang:monitor(process, P),
			  receive
			      {'DOWN', M, process, P, _} ->
				  ok
			  end
		  end,
		  Procs),
    true = ets:delete(Tab),
    verify_etsmem(EtsMem).

do_heavy_concurrent_proc(_Tab, 0, _Offs) ->
    done;
do_heavy_concurrent_proc(Tab, N, Offs) when (N+Offs) rem 100 == 0 ->
    Data = {"here", are, "S O M E ", data, "toooooooooooooooooo", insert,
	    make_ref(), make_ref(), make_ref()},
    true=ets:insert(Tab, {{self(),Data}, N}),
    do_heavy_concurrent_proc(Tab, N-1, Offs);
do_heavy_concurrent_proc(Tab, N, Offs) ->
    _ = ets:lookup(Tab, N),
    do_heavy_concurrent_proc(Tab, N-1, Offs).


fold_empty(Config) when is_list(Config) ->
    repeat_for_opts_all_set_table_types(
      fun(Opts) ->
              EtsMem = etsmem(),
              Tab = make_table(a, Opts, []),
              [] = ets:foldl(fun(_X) -> exit(hej) end, [], Tab),
              [] = ets:foldr(fun(_X) -> exit(hej) end, [], Tab),
              true = ets:delete(Tab),
              verify_etsmem(EtsMem)
      end),
    ok.

foldl(Config) when is_list(Config) ->
    repeat_for_opts_all_table_types(
      fun(Opts) ->
              EtsMem = etsmem(),
              L = [{a,1}, {c,3}, {b,2}],
              LS = lists:sort(L),
              Tab = make_table(a, Opts, L),
              LS = lists:sort(ets:foldl(fun(E,A) -> [E|A] end, [], Tab)),
              true = ets:delete(Tab),
              verify_etsmem(EtsMem)
      end),
    ok.

foldr(Config) when is_list(Config) ->
    repeat_for_opts_all_table_types(
      fun(Opts) ->
              EtsMem = etsmem(),
              L = [{a,1}, {c,3}, {b,2}],
              LS = lists:sort(L),
              Tab = make_table(a, Opts, L),
              LS = lists:sort(ets:foldr(fun(E,A) -> [E|A] end, [], Tab)),
              true = ets:delete(Tab),
              verify_etsmem(EtsMem)
      end),
    ok.

foldl_ordered(Config) when is_list(Config) ->
    repeat_for_opts_all_ord_set_table_types(
      fun(Opts) ->
              EtsMem = etsmem(),
              L = [{a,1}, {c,3}, {b,2}],
              LS = lists:sort(L),
              Tab = make_table(a, Opts, L),
              LS = lists:reverse(ets:foldl(fun(E,A) -> [E|A] end, [], Tab)),
              true = ets:delete(Tab),
              verify_etsmem(EtsMem)
      end),
    ok.

foldr_ordered(Config) when is_list(Config) ->
    repeat_for_opts_all_ord_set_table_types(
      fun(Opts) ->
              EtsMem = etsmem(),
              L = [{a,1}, {c,3}, {b,2}],
              LS = lists:sort(L),
              Tab = make_table(a, Opts, L),
              LS = ets:foldr(fun(E,A) -> [E|A] end, [], Tab),
              true = ets:delete(Tab),
              verify_etsmem(EtsMem)
      end),
    ok.

%% Test ets:member BIF.
member(Config) when is_list(Config) ->
    repeat_for_opts(fun member_do/1, [write_concurrency, all_types]).

member_do(Opts) ->
    EtsMem = etsmem(),
    T = ets_new(xxx, Opts),
    false = ets:member(T,hej),
    E = fun(0,_F)->ok;
	   (N,F) ->
		ets:insert(T,{N,N rem 10}),
		F(N-1,F)
	end,
    E(10000,E),
    false = ets:member(T,hej),
    true = ets:member(T,1),
    false = ets:member(T,20000),
    ets:delete(T,5),
    false = ets:member(T,5),
    ets:safe_fixtable(T,true),
    ets:delete(T,6),
    false = ets:member(T,6),
    ets:safe_fixtable(T,false),
    false = ets:member(T,6),
    ets:delete(T),
    {'EXIT',{badarg,_}} = (catch ets:member(finnsinte, 23)),
    {'EXIT',{badarg,_}} = (catch ets:member(T, 23)),
    verify_etsmem(EtsMem).


build_table(L1,L2,Num) ->
    T = ets_new(xxx, [ordered_set]),
    lists:foreach(
      fun(X1) ->
	      lists:foreach(
		fun(X2) ->
			F = fun(FF,N) ->
				    ets:insert(T,{{X1,X2,N}, X1, X2, N}),
				    case N of
					0 ->
					    ok;
					_ ->
					    FF(FF,N-1)
				    end
			    end,
			F(F,Num)
		end, L2)
      end, L1),
    T.

build_table2(L1,L2,Num) ->
    T = ets_new(xxx, [ordered_set]),
    lists:foreach(
      fun(X1) ->
	      lists:foreach(
		fun(X2) ->
			F = fun(FF,N) ->
				    ets:insert(T,{{N,X1,X2}, N, X1, X2}),
				    case N of
					0 ->
					    ok;
					_ ->
					    FF(FF,N-1)
				    end
			    end,
			F(F,Num)
		end, L2)
      end, L1),
    T.

time_match_object(Tab,Match, Res) ->
    T1 = erlang:monotonic_time(microsecond),
    Res = ets:match_object(Tab,Match),
    T2 = erlang:monotonic_time(microsecond),
    T2 - T1.

time_match(Tab,Match) ->
    T1 = erlang:monotonic_time(microsecond),
    ets:match(Tab,Match),
    T2 = erlang:monotonic_time(microsecond),
    T2 - T1.

seventyfive_percent_success(_,S,Fa,0) ->
    true = (S > ((S + Fa) * 0.75));

seventyfive_percent_success(F, S, Fa, N) when is_function(F, 0) ->
    try F() of
        _ ->
	    seventyfive_percent_success(F, S+1, Fa, N-1)
    catch error:_ ->
	    seventyfive_percent_success(F, S, Fa+1, N-1)
    end.

fifty_percent_success(_,S,Fa,0) ->
    true = (S > ((S + Fa) * 0.5));

fifty_percent_success(F, S, Fa, N) when is_function(F, 0) ->
    try F() of
        _ ->
	    fifty_percent_success(F, S+1, Fa, N-1)
    catch
        error:_ ->
	    fifty_percent_success(F, S, Fa+1, N-1)
    end.

create_random_string(0) ->
    [];

create_random_string(OfLength) ->
    C = case rand:uniform(2) of
	    1 ->
		(rand:uniform($Z - $A + 1) - 1) + $A;
	    _ ->
		(rand:uniform($z - $a + 1) - 1) + $a
	end,
    [C | create_random_string(OfLength - 1)].


create_random_tuple(OfLength) ->
    list_to_tuple(lists:map(fun(X) ->
				    list_to_atom([X])
			    end,create_random_string(OfLength))).

create_partly_bound_tuple(OfLength) ->
    case rand:uniform(2) of
	1 ->
	    create_partly_bound_tuple1(OfLength);
	_ ->
	    create_partly_bound_tuple3(OfLength)
    end.

create_partly_bound_tuple1(OfLength) ->
    T0 = create_random_tuple(OfLength),
    I = rand:uniform(OfLength),
    setelement(I,T0,'$1').


set_n_random_elements(T0,0,_,_) ->
    T0;
set_n_random_elements(T0,N,OfLength,GenFun) ->
    I = rand:uniform(OfLength),
    What = GenFun(I),
    case element(I,T0) of
	What ->
	    set_n_random_elements(T0,N,OfLength,GenFun);
	_Else ->
	    set_n_random_elements(setelement(I,T0,What),
				  N-1,OfLength,GenFun)
    end.

make_dollar_atom(I) ->
    list_to_atom([$$] ++ integer_to_list(I)).
create_partly_bound_tuple2(OfLength) ->
    T0 = create_random_tuple(OfLength),
    I = rand:uniform(OfLength - 1),
    set_n_random_elements(T0,I,OfLength,fun make_dollar_atom/1).

create_partly_bound_tuple3(OfLength) ->
    T0 = create_random_tuple(OfLength),
    I = rand:uniform(OfLength - 1),
    set_n_random_elements(T0,I,OfLength,fun(_) -> '_' end).

do_n_times(_,0) ->
    ok;
do_n_times(Fun,N) ->
    Fun(),
    case N rem 1000 of
	0 ->
	    io:format(".");
	_ ->
	    ok
    end,
    do_n_times(Fun,N-1).

make_table(Name, Options, Elements) ->
    T = ets_new(Name, Options),
    lists:foreach(fun(E) -> ets:insert(T, E) end, Elements),
    T.

filltabint(Tab,0) ->
    Tab;
filltabint(Tab,N) ->
    ets:insert(Tab,{N,integer_to_list(N)}),
    filltabint(Tab,N-1).

filltabint2(Tab,0) ->
    Tab;
filltabint2(Tab,N) ->
    ets:insert(Tab,{N + N rem 2,integer_to_list(N)}),
    filltabint2(Tab,N-1).
filltabint3(Tab,0) ->
    Tab;
filltabint3(Tab,N) ->
    ets:insert(Tab,{N + N rem 2,integer_to_list(N + N rem 2)}),
    filltabint3(Tab,N-1).
xfilltabint(Tab,N) ->
    case ets:info(Tab,type) of
	bag ->
	    filltabint2(Tab,N);
	duplicate_bag ->
	    ets:select_delete(Tab,[{'_',[],[true]}]),
	    filltabint3(Tab,N);
	_ ->
	    filltabint(Tab,N)
    end.

filltabintup(Tab,0) ->
    Tab;
filltabintup(Tab,N) ->
    ets:insert(Tab,{{N,integer_to_list(N)},integer_to_list(N)}),
    filltabintup(Tab,N-1).

filltabintup2(Tab,0) ->
    Tab;
filltabintup2(Tab,N) ->
    ets:insert(Tab,{{N + N rem 2,integer_to_list(N)},integer_to_list(N)}),
    filltabintup2(Tab,N-1).
filltabintup3(Tab,0) ->
    Tab;
filltabintup3(Tab,N) ->
    ets:insert(Tab,{{N + N rem 2,integer_to_list(N + N rem 2)},integer_to_list(N + N rem 2)}),
    filltabintup3(Tab,N-1).

filltabstr(Tab,N) ->
    filltabstr(Tab,0,N).
filltabstr(Tab,N,N) ->
    Tab;
filltabstr(Tab,Floor,N) when N > Floor ->
    ets:insert(Tab,{integer_to_list(N),N}),
    filltabstr(Tab,Floor,N-1).

filltabstr2(Tab,0) ->
    Tab;
filltabstr2(Tab,N) ->
    ets:insert(Tab,{integer_to_list(N),N}),
    ets:insert(Tab,{integer_to_list(N),N+1}),
    filltabstr2(Tab,N-1).
filltabstr3(Tab,0) ->
    Tab;
filltabstr3(Tab,N) ->
    ets:insert(Tab,{integer_to_list(N),N}),
    ets:insert(Tab,{integer_to_list(N),N}),
    filltabstr3(Tab,N-1).
xfilltabstr(Tab,N) ->
    case ets:info(Tab,type) of
	bag ->
	    filltabstr2(Tab,N);
	duplicate_bag ->
	    ets:select_delete(Tab,[{'_',[],[true]}]),
	    filltabstr3(Tab,N);
	_ ->
	    filltabstr(Tab,N)
    end.

fill_sets_int(N) ->
    fill_sets_int(N,[]).
fill_sets_int(N,Opts) ->
    Tab1 = ets_new(xxx, [ordered_set|Opts]),
    filltabint(Tab1,N),
    Tab2 = ets_new(xxx, [set|Opts]),
    filltabint(Tab2,N),
    Tab3 = ets_new(xxx, [bag|Opts]),
    filltabint2(Tab3,N),
    Tab4 = ets_new(xxx, [duplicate_bag|Opts]),
    filltabint3(Tab4,N),
    [Tab1,Tab2,Tab3,Tab4].

fill_sets_intup(N,Opts) ->
    Tab1 = ets_new(xxx, [ordered_set|Opts]),
    filltabintup(Tab1,N),
    Tab2 = ets_new(xxx, [set|Opts]),
    filltabintup(Tab2,N),
    Tab3 = ets_new(xxx, [bag|Opts]),
    filltabintup2(Tab3,N),
    Tab4 = ets_new(xxx, [duplicate_bag|Opts]),
    filltabintup3(Tab4,N),
    [Tab1,Tab2,Tab3,Tab4].

check_fun(_Tab,_Fun,'$end_of_table') ->
    ok;
check_fun(Tab,Fun,Item) ->
    lists:foreach(fun(Obj) ->
			  true = Fun(Obj)
		  end,
		  ets:lookup(Tab,Item)),
    check_fun(Tab,Fun,ets:next(Tab,Item)).

check(Tab,Fun,N) ->
    N = ets:info(Tab, size),
    check_fun(Tab,Fun,ets:first(Tab)).



del_one_by_one_set(T,N,N) ->
    0 = ets:info(T,size),
    ok;
del_one_by_one_set(T,From,To) ->
    N = ets:info(T,size),
    ets:delete_object(T,{From, integer_to_list(From)}),
    N = (ets:info(T,size) + 1),
    Next = if
	       From < To ->
		   From + 1;
	       true ->
		   From - 1
	   end,
    del_one_by_one_set(T,Next,To).

del_one_by_one_bag(T,N,N) ->
    0 = ets:info(T,size),
    ok;
del_one_by_one_bag(T,From,To) ->
    N = ets:info(T,size),
    ets:delete_object(T,{From + From rem 2, integer_to_list(From)}),
    N = (ets:info(T,size) + 1),
    Next = if
	       From < To ->
		   From + 1;
	       true ->
		   From - 1
	   end,
    del_one_by_one_bag(T,Next,To).


del_one_by_one_dbag_1(T,N,N) ->
    0 = ets:info(T,size),
    ok;
del_one_by_one_dbag_1(T,From,To) ->
    N = ets:info(T,size),
    ets:delete_object(T,{From, integer_to_list(From)}),
    case From rem 2 of
	0 ->
	    N = (ets:info(T,size) + 2);
	1 ->
	    N = ets:info(T,size)
    end,
    Next = if
	       From < To ->
		   From + 1;
	       true ->
		   From - 1
	   end,
    del_one_by_one_dbag_1(T,Next,To).

del_one_by_one_dbag_2(T,N,N) ->
    0 = ets:info(T,size),
    ok;
del_one_by_one_dbag_2(T,From,To) ->
    N = ets:info(T,size),
    ets:delete_object(T,{From, integer_to_list(From)}),
    case From rem 2 of
	0 ->
	    N = (ets:info(T,size) + 3);
	1 ->
	    N = (ets:info(T,size) + 1)
    end,
    Next = if
	       From < To ->
		   From + 1;
	       true ->
		   From - 1
	   end,
    del_one_by_one_dbag_2(T,Next,To).

del_one_by_one_dbag_3(T,N,N) ->
    0 = ets:info(T,size),
    ok;
del_one_by_one_dbag_3(T,From,To) ->
    N = ets:info(T,size),
    Obj = {From + From rem 2, integer_to_list(From)},
    ets:delete_object(T,Obj),
    case From rem 2 of
	0 ->
	    N = (ets:info(T,size) + 2);
	1 ->
	    N = (ets:info(T,size) + 1),
	    Obj2 = {From, integer_to_list(From)},
	    ets:delete_object(T,Obj2),
	    N = (ets:info(T,size) + 2)
    end,
    Next = if
	       From < To ->
		   From + 1;
	       true ->
		   From - 1
	   end,
    del_one_by_one_dbag_3(T,Next,To).


successive_delete(Table,From,To,Type) ->
    successive_delete(Table,From,To,Type,ets:info(Table,type)).

successive_delete(_Table,N,N,_,_) ->
    ok;
successive_delete(Table,From,To,Type,TType) ->
    MS = case Type of
	     bound ->
		 [{{From,'_'},[],[true]}];
	     unbound ->
		 [{{'$1','_'},[],[{'==', '$1', From}]}]
	 end,
    case TType of
	X when X == bag; X == duplicate_bag ->
	    %%erlang:display(From),
	    case From rem 2 of
		0 ->
		    2 = ets:select_delete(Table,MS);
		_ ->
		    0 = ets:select_delete(Table,MS)
	    end;
	_ ->
	    1 = ets:select_delete(Table,MS)
    end,
    Next = if
	       From < To ->
		   From + 1;
	       true ->
		   From - 1
	   end,
    successive_delete(Table, Next, To, Type,TType).

gen_dets_filename(Config,N) ->
    filename:join(proplists:get_value(priv_dir,Config),
		  "testdets_" ++ integer_to_list(N) ++ ".dets").

otp_6842_select_1000(Config) when is_list(Config) ->
    repeat_for_opts_all_ord_set_table_types(
      fun(Opts) ->
              KeyRange = 10000,
              Tab = ets_new(xxx, Opts, KeyRange),
              [ets:insert(Tab,{X,X}) || X <- lists:seq(1,KeyRange)],
              AllTrue = lists:duplicate(10,true),
              AllTrue =
                  [ length(
                      element(1,
                              ets:select(Tab,[{'_',[],['$_']}],X*1000))) =:=
                        X*1000 || X <- lists:seq(1,10) ],
              Sequences = [[1000,1000,1000,1000,1000,1000,1000,1000,1000,1000],
                           [2000,2000,2000,2000,2000],
                           [3000,3000,3000,1000],
                           [4000,4000,2000],
                           [5000,5000],
                           [6000,4000],
                           [7000,3000],
                           [8000,2000],
                           [9000,1000],
                           [10000]],
              AllTrue = [ check_seq(Tab, ets:select(Tab,[{'_',[],['$_']}],hd(L)),L) ||
                            L <- Sequences ],
              ets:delete(Tab)
      end),
    ok.

check_seq(_,'$end_of_table',[]) ->
    true;
check_seq(Tab,{L,C},[H|T]) when length(L) =:= H ->
    check_seq(Tab, ets:select(C),T);
check_seq(A,B,C) ->
    erlang:display({A,B,C}),
    false.

otp_6338(Config) when is_list(Config) ->
    repeat_for_opts_all_ord_set_table_types(
      fun(Opts) ->
              L = binary_to_term(<<131,108,0,0,0,2,104,2,108,0,0,0,2,103,100,0,19,112,112,
                                   98,49,95,98,115,49,50,64,98,108,97,100,101,95,48,95,53,
                                   0,0,33,50,0,0,0,4,1,98,0,0,23,226,106,100,0,4,101,120,
                                   105,116,104,2,108,0,0,0,2,104,2,100,0,3,115,98,109,100,
                                   0,19,112,112,98,50,95,98,115,49,50,64,98,108,97,100,
                                   101,95,48,95,56,98,0,0,18,231,106,100,0,4,114,101,99,
                                   118,106>>),
              T = ets_new(xxx,Opts),
              lists:foreach(fun(X) -> ets:insert(T,X) end,L),
              [[4839,recv]] = ets:match(T,{[{sbm,ppb2_bs12@blade_0_8},'$1'],'$2'}),
              ets:delete(T)
      end),
    ok.

%% OTP-15660: Verify select not doing excessive trapping
%%            when process have mbuf heap fragments.
select_mbuf_trapping(Config) when is_list(Config) ->
    select_mbuf_trapping_do(set),
    select_mbuf_trapping_do(ordered_set).

select_mbuf_trapping_do(Type) ->
    T = ets:new(xxx, [Type]),
    NKeys = 50,
    [ets:insert(T, {K, value}) || K <- lists:seq(1,NKeys)],

    {priority, Prio} = process_info(self(), priority),
    Tracee = self(),
    [SchedTracer]
	= start_loopers(1, Prio,
			fun (SC) ->
				receive
				    {trace, Tracee, out, _} ->
					SC+1;
				    done ->
					Tracee ! {schedule_count, SC},
                                        exit(normal)
				end
			end,
			0),

    erlang:garbage_collect(),
    1 = erlang:trace(self(), true, [running,{tracer,SchedTracer}]),

    %% Artificially create an mbuf heap fragment
    MbufTerm = "Frag me up",
    MbufTerm = erts_debug:set_internal_state(mbuf, MbufTerm),

    Keys = ets:select(T, [{{'$1', value}, [], ['$1']}]),
    NKeys = length(Keys),

    1 = erlang:trace(self(), false, [running]),
    Ref = erlang:trace_delivered(Tracee),
    receive
        {trace_delivered, Tracee, Ref} ->
            SchedTracer ! done
    end,
    receive
	{schedule_count, N} ->
	    io:format("~p context switches: ~p", [Type,N]),
	    if
		N < 3 -> ok;
		true -> ct:fail(failed)
	    end
    end,
    true = ets:delete(T),
    ok.



%% Elements could come in the wrong order in a bag if a rehash occurred.
otp_5340(Config) when is_list(Config) ->
    repeat_for_opts(fun otp_5340_do/1).

otp_5340_do(Opts) ->
    N = 3000,
    T = ets_new(otp_5340, [bag,public | Opts]),
    Ids = [1,2,3,4,5],
    [w(T, N, Id) || Id <- Ids],
    verify(T, Ids),
    ets:delete(T).

w(_,0, _) -> ok;
w(T,N, Id) ->
    ets:insert(T, {N, Id}),
    w(T,N-1,Id).

verify(T, Ids) ->
    List = my_tab_to_list(T),
    Errors = lists:filter(fun(Bucket) ->
				  verify2(Bucket, Ids)
			  end, List),
    case Errors of
	[] ->
	    ok;
	_ ->
	    io:format("Failed:\n~p\n", [Errors]),
	    ct:fail(failed)
    end.

verify2([{_N,Id}|RL], [Id|R]) ->
    verify2(RL,R);
verify2([],[]) -> false;
verify2(_Err, _) ->
    true.

%% delete_object followed by delete on fixed bag failed to delete objects.
otp_7665(Config) when is_list(Config) ->
    repeat_for_opts(fun otp_7665_do/1).

otp_7665_do(Opts) ->
    Tab = ets_new(otp_7665,[bag | Opts]),
    Min = 0,
    Max = 10,
    lists:foreach(fun(N)-> otp_7665_act(Tab,Min,Max,N) end,
		  lists:seq(Min,Max)),
    true = ets:delete(Tab).

otp_7665_act(Tab,Min,Max,DelNr) ->
    List1 = [{key,N} || N <- lists:seq(Min,Max)],
    true = ets:insert(Tab, List1),
    true = ets:safe_fixtable(Tab, true),
    true = ets:delete_object(Tab, {key,DelNr}),
    List2 = lists:sort(lists:delete({key,DelNr}, List1)),

    %% Now verify that we find all remaining objects
    List2 = lists:sort(ets:lookup(Tab,key)),
    EList2 = lists:sort(lists:map(fun({key,N})-> N end,
                                  List2)),
    EList2 = lists:sort(ets:lookup_element(Tab,key,2)),
    true = ets:delete(Tab, key),
    [] = ets:lookup(Tab, key),
    true = ets:safe_fixtable(Tab, false),
    ok.

%% Whitebox testing of meta name table hashing.
meta_wb(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    repeat_for_opts_all_non_stim_table_types(fun meta_wb_do/1),
    verify_etsmem(EtsMem).


meta_wb_do(Opts) ->
    %% Do random new/delete/rename of colliding named tables
    Names0 = [pioneer | colliding_names(pioneer)],

    %% Remove any names that happen to exist as tables already
    Names = lists:filter(fun(Name) -> ets:info(Name) == undefined end,
                         Names0),
    Len = length(Names),
    OpFuns = {fun meta_wb_new/4, fun meta_wb_delete/4, fun meta_wb_rename/4},

    true = (Len >= 3),

    io:format("Colliding names = ~p\n",[Names]),
    F = fun(0,_,_) -> ok;
	   (N,Tabs,Me) ->
		Name1 = lists:nth(rand:uniform(Len), Names),
		Name2 = lists:nth(rand:uniform(Len), Names),
		Op = element(rand:uniform(3),OpFuns),
		NTabs = Op(Name1, Name2, Tabs, Opts),
		Me(N-1, NTabs, Me)
	end,
    F(Len*100, [], F),

    %% cleanup
    lists:foreach(fun(Name)->catch ets:delete(Name) end,
		  Names).

meta_wb_new(Name, _, Tabs, Opts) ->
    case (catch ets_new(Name,[named_table|Opts])) of
	Name ->
	    false = lists:member(Name, Tabs),
	    [Name | Tabs];
	{'EXIT',{badarg,_}} ->
	    true = lists:member(Name, Tabs),
	    Tabs
    end.
meta_wb_delete(Name, _, Tabs, _) ->
    case (catch ets:delete(Name)) of
	true ->
	    true = lists:member(Name, Tabs),
	    lists:delete(Name, Tabs);
	{'EXIT',{badarg,_}} ->
	    false = lists:member(Name, Tabs),
	    Tabs
    end.
meta_wb_rename(Old, New, Tabs, _) ->
    case (catch ets:rename(Old,New)) of
	New ->
	    true = lists:member(Old, Tabs)
		andalso not lists:member(New, Tabs),
	    [New | lists:delete(Old, Tabs)];
	{'EXIT',{badarg,_}} ->
	    true = not lists:member(Old, Tabs)
		orelse lists:member(New,Tabs),
	    Tabs
    end.


colliding_names(Name) ->
    erts_debug:set_internal_state(colliding_names, {Name,5}).


%% OTP_6913: Grow and shrink.

grow_shrink(Config) when is_list(Config) ->
    repeat_for_all_set_table_types(
      fun(Opts) ->
              EtsMem = etsmem(),
              
              Set = ets_new(a, Opts, 5000),
              grow_shrink_0(0, 3071, 3000, 5000, Set),
              ets:delete(Set),
              
              verify_etsmem(EtsMem)
      end).

grow_shrink_0(N, _, _, Max, _) when N >= Max ->
    ok;
grow_shrink_0(N0, GrowN, ShrinkN, Max, T) ->
    N1 = grow_shrink_1(N0, GrowN, ShrinkN, T),
    grow_shrink_0(N1, GrowN, ShrinkN, Max, T).

grow_shrink_1(N0, GrowN, ShrinkN, T) ->
    N1 = grow_shrink_2(N0+1, N0 + GrowN, T),
    grow_shrink_3(N1, N1 - ShrinkN, T).

grow_shrink_2(N, GrowTo, _) when N > GrowTo ->
    GrowTo;
grow_shrink_2(N, GrowTo, T) ->
    true = ets:insert(T, {N,a}),
    grow_shrink_2(N+1, GrowTo, T).

grow_shrink_3(N, ShrinkTo, _) when N =< ShrinkTo ->
    ShrinkTo;
grow_shrink_3(N, ShrinkTo, T) ->
    true = ets:delete(T, N),
    grow_shrink_3(N-1, ShrinkTo, T).

%% Grow a hash table that still contains pseudo-deleted objects.
grow_pseudo_deleted(Config) when is_list(Config) ->
    only_if_smp(fun() -> grow_pseudo_deleted_do() end).

grow_pseudo_deleted_do() ->
    lists:foreach(fun(Type) -> grow_pseudo_deleted_do(Type) end,
		  [set,bag,duplicate_bag]).

grow_pseudo_deleted_do(Type) ->
    process_flag(scheduler,1),
    Self = self(),
    T = ets_new(kalle,[Type,public,{write_concurrency,true}]),
    Mod = 7, Mult = 10000,
    filltabint(T,Mod*Mult),
    true = ets:safe_fixtable(T,true),
    Mult = ets:select_delete(T,
			     [{{'$1', '_'},
			       [{'=:=', {'rem', '$1', Mod}, 0}],
			       [true]}]),
    Left = Mult*(Mod-1),
    Left = ets:info(T,size),
    Mult = get_kept_objects(T),
    filltabstr(T,Mult),
    my_spawn_opt(
      fun() ->
	      true = ets:info(T,fixed),
	      Self ! start,
	      io:put_chars("Starting to filltabstr...\n"),
	      do_tc(fun() ->
			    filltabstr(T, Mult, Mult+10000)
		    end,
		    fun(Elapsed) ->
			    io:format("Done with filltabstr in ~p ms\n",
				      [Elapsed])
		    end),
	      Self ! done
      end, [link, {scheduler,2}]),
    start = receive_any(),
    io:format("Unfixing table... nitems=~p\n", [ets:info(T, size)]),
    do_tc(fun() ->
		  true = ets:safe_fixtable(T, false)
	  end,
	  fun(Elapsed) ->
		  io:format("Unfix table done in ~p ms. nitems=~p\n",
			    [Elapsed,ets:info(T, size)])
	  end),
    false = ets:info(T,fixed),
    0 = get_kept_objects(T),
    done = receive_any(),
    %%verify_table_load(T), % may fail if concurrency is poor (genny)
    ets:delete(T),
    process_flag(scheduler,0).

%% Shrink a hash table that still contains pseudo-deleted objects.
shrink_pseudo_deleted(Config) when is_list(Config) ->
    only_if_smp(fun()->shrink_pseudo_deleted_do() end).

shrink_pseudo_deleted_do() ->
    lists:foreach(fun(Type) -> shrink_pseudo_deleted_do(Type) end,
		  [set,bag,duplicate_bag]).

shrink_pseudo_deleted_do(Type) ->
    process_flag(scheduler,1),
    Self = self(),
    T = ets_new(kalle,[Type,public,{write_concurrency,true}]),
    Half = 10000,
    filltabint(T,Half*2),
    true = ets:safe_fixtable(T,true),
    Half = ets:select_delete(T,
			     [{{'$1', '_'},
			       [{'>', '$1', Half}],
			       [true]}]),
    Half = ets:info(T,size),
    Half = get_kept_objects(T),
    my_spawn_opt(
      fun()-> true = ets:info(T,fixed),
	      Self ! start,
	      io:put_chars("Starting to delete... ~p\n"),
	      do_tc(fun() ->
			    del_one_by_one_set(T, 1, Half+1)
		    end,
		    fun(Elapsed) ->
			    io:format("Done with delete in ~p ms.\n",
				      [Elapsed])
		    end),
	      Self ! done
      end, [link, {scheduler,2}]),
    start = receive_any(),
    io:format("Unfixing table... nitems=~p\n", [ets:info(T, size)]),
    do_tc(fun() ->
		  true = ets:safe_fixtable(T, false)
	  end,
	  fun(Elapsed) ->
		  io:format("Unfix table done in ~p ms. nitems=~p\n",
			    [Elapsed,ets:info(T, size)])
	  end),
    false = ets:info(T,fixed),
    0 = get_kept_objects(T),
    done = receive_any(),
    %%verify_table_load(T), % may fail if concurrency is poor (genny)
    ets:delete(T),
    process_flag(scheduler,0).



meta_lookup_unnamed_read(Config) when is_list(Config) ->
    InitF = fun(_) -> Tab = ets_new(unnamed,[]),
		      true = ets:insert(Tab,{key,data}),
		      Tab
	    end,
    ExecF = fun(Tab) -> [{key,data}] = ets:lookup(Tab,key),
			Tab
	    end,
    FiniF = fun(Tab) -> true = ets:delete(Tab)
	    end,
    run_smp_workers(InitF,ExecF,FiniF,10000).

meta_lookup_unnamed_write(Config) when is_list(Config) ->
    InitF = fun(_) -> Tab = ets_new(unnamed,[]),
		      {Tab,0}
	    end,
    ExecF = fun({Tab,N}) -> true = ets:insert(Tab,{key,N}),
			    {Tab,N+1}
	    end,
    FiniF = fun({Tab,_}) -> true = ets:delete(Tab)
	    end,
    run_smp_workers(InitF,ExecF,FiniF,10000).

meta_lookup_named_read(Config) when is_list(Config) ->
    InitF = fun([ProcN|_]) -> Name = list_to_atom(integer_to_list(ProcN)),
			      Tab = ets_new(Name,[named_table]),
			      true = ets:insert(Tab,{key,data}),
			      Tab
	    end,
    ExecF = fun(Tab) -> [{key,data}] = ets:lookup(Tab,key),
			Tab
	    end,
    FiniF = fun(Tab) -> true = ets:delete(Tab)
	    end,
    run_smp_workers(InitF,ExecF,FiniF,10000).

meta_lookup_named_write(Config) when is_list(Config) ->
    InitF = fun([ProcN|_]) -> Name = list_to_atom(integer_to_list(ProcN)),
			      Tab = ets_new(Name,[named_table]),
			      {Tab,0}
	    end,
    ExecF = fun({Tab,N}) -> true = ets:insert(Tab,{key,N}),
			    {Tab,N+1}
	    end,
    FiniF = fun({Tab,_}) -> true = ets:delete(Tab)
	    end,
    run_smp_workers(InitF,ExecF,FiniF,10000).

meta_newdel_unnamed(Config) when is_list(Config) ->
    InitF = fun(_) -> ok end,
    ExecF = fun(_) -> Tab = ets_new(unnamed,[]),
		      true = ets:delete(Tab)
	    end,
    FiniF = fun(_) -> ok end,
    run_smp_workers(InitF,ExecF,FiniF,10000).

meta_newdel_named(Config) when is_list(Config) ->
    InitF = fun([ProcN|_]) -> list_to_atom(integer_to_list(ProcN))
	    end,
    ExecF = fun(Name) -> Name = ets_new(Name,[named_table]),
			 true = ets:delete(Name),
			 Name
	    end,
    FiniF = fun(_) -> ok end,
    run_smp_workers(InitF,ExecF,FiniF,10000).

%% Concurrent insert's on same table.
smp_insert(Config) when is_list(Config) ->
    repeat_for_opts(fun smp_insert_do/1,
                    [[set,ordered_set,stim_cat_ord_set]]).

smp_insert_do(Opts) ->
    KeyRange = 10000,
    ets_new(smp_insert,[named_table,public,{write_concurrency,true}|Opts],
            KeyRange),
    InitF = fun(_) -> ok end,
    ExecF = fun(_) -> true = ets:insert(smp_insert,{rand:uniform(KeyRange)})
            end,
    FiniF = fun(_) -> ok end,
    run_smp_workers(InitF,ExecF,FiniF,100000),
    verify_table_load(smp_insert),
    ets:delete(smp_insert).

%% Concurrent deletes on same fixated table.
smp_fixed_delete(Config) when is_list(Config) ->
    only_if_smp(fun() -> smp_fixed_delete_do() end).

smp_fixed_delete_do() ->
    T = ets_new(foo,[public,{write_concurrency,true}]),
    %%Mem = ets:info(T,memory),
    NumOfObjs = 100000,
    filltabint(T,NumOfObjs),
    ets:safe_fixtable(T,true),
    Buckets = num_of_buckets(T),
    InitF = fun([ProcN,NumOfProcs|_]) -> {ProcN,NumOfProcs} end,
    ExecF = fun({Key,_}) when Key > NumOfObjs ->
                    [end_of_work];
               ({Key,Increment}) ->
                    true = ets:delete(T,Key),
                    {Key+Increment,Increment}
            end,
    FiniF = fun(_) -> ok end,
    run_sched_workers(InitF,ExecF,FiniF,NumOfObjs),
    0 = ets:info(T,size),
    true = ets:info(T,fixed),
    Buckets = num_of_buckets(T),
    case ets:info(T,type) of
        set -> NumOfObjs = get_kept_objects(T);
        _ -> ok
    end,
    ets:safe_fixtable(T,false),
    %% Will fail as unfix does not shrink the table:
    %%Mem = ets:info(T,memory),
    %%verify_table_load(T),
    ets:delete(T).

%% ERL-720
%% Provoke race between ets:delete and table unfix (by select_count)
%% that caused ets_misc memory counter to indicate false leak.
delete_unfix_race(Config) when is_list(Config) ->
    EtsMem = etsmem(),
    Table = ets:new(t,[set,public,{write_concurrency,true}]),
    InsertOp =
        fun() ->
                receive stop ->
                        false
                after 0 ->
                        ets:insert(Table, {rand:uniform(10)}),
                        true
                end
        end,
    DeleteOp =
        fun() ->
                receive stop ->
                        false
                after 0 ->
                        ets:delete(Table, rand:uniform(10)),
                        true
                end
        end,
    SelectOp =
        fun() ->
                ets:select_count(Table, ets:fun2ms(fun(X) -> true end))
        end,
    Main = self(),
    Ins = spawn(fun()-> repeat_while(InsertOp), Main ! self() end),
    Del = spawn(fun()-> repeat_while(DeleteOp), Main ! self() end),
    spawn(fun()->
                  repeat(SelectOp, 10000),
                  Del ! stop,
                  Ins ! stop
          end),
    [receive Pid -> ok end || Pid <- [Ins,Del]],
    ets:delete(Table),
    verify_etsmem(EtsMem).

num_of_buckets(T) ->
    case ets:info(T,type) of
        set -> element(1,ets:info(T,stats));
        bag -> element(1,ets:info(T,stats));
        duplicate_bag -> element(1,ets:info(T,stats));
        _ -> ok
    end.

%% Fixate hash table while other process is busy doing unfix.
smp_unfix_fix(Config) when is_list(Config) ->
    only_if_smp(fun()-> smp_unfix_fix_do() end).

smp_unfix_fix_do() ->
    process_flag(scheduler,1),
    Parent = self(),
    T = ets_new(foo,[public,{write_concurrency,true}]),
    %%Mem = ets:info(T,memory),
    NumOfObjs = 100000,
    Deleted = 50000,
    filltabint(T,NumOfObjs),
    ets:safe_fixtable(T,true),
    Buckets = num_of_buckets(T),
    Deleted = ets:select_delete(T,[{{'$1', '_'},
				    [{'=<','$1', Deleted}],
				    [true]}]),
    Buckets = num_of_buckets(T),
    Left = NumOfObjs - Deleted,
    Left = ets:info(T,size),
    true = ets:info(T,fixed),
    Deleted = get_kept_objects(T),

    {Child, Mref} =
	my_spawn_opt(
	  fun()->
		  true = ets:info(T,fixed),
		  Parent ! start,
		  io:format("Child waiting for table to be unfixed... mem=~p\n",
			    [ets:info(T, memory)]),
		  do_tc(fun() ->
				repeat_while(fun()-> ets:info(T, fixed) end)
			end,
			fun(Elapsed) ->
				io:format("Table unfixed in ~p ms."
					  " Child Fixating! mem=~p\n",
					  [Elapsed,ets:info(T,memory)])
			end),
		  true = ets:safe_fixtable(T,true),
		  repeat_while(fun(Key) when Key =< NumOfObjs ->
				       ets:delete(T,Key), {true,Key+1};
				  (Key) -> {false,Key}
			       end,
			       Deleted),
		  0 = ets:info(T,size),
		  true = get_kept_objects(T) >= Left,
		  done = receive_any()
	  end,
	  [link, monitor, {scheduler,2}]),

    start = receive_any(),
    true = ets:info(T,fixed),
    io:put_chars("Parent starting to unfix... ~p\n"),
    do_tc(fun() ->
		  ets:safe_fixtable(T, false)
	  end,
	  fun(Elapsed) ->
		  io:format("Parent done with unfix in ~p ms.\n",
			    [Elapsed])
	  end),
    Child ! done,
    {'DOWN', Mref, process, Child, normal} = receive_any(),
    false = ets:info(T,fixed),
    0 = get_kept_objects(T),
    %%verify_table_load(T),
    ets:delete(T),
    process_flag(scheduler,0).

%% Unsafe unfix was done by trapping select/match.
otp_8166(Config) when is_list(Config) ->
    only_if_smp(3, fun()-> otp_8166_do(false),
			   otp_8166_do(true)
		   end).

otp_8166_do(WC) ->
    %% Bug scenario: One process segv while reading the table because another
    %% process is doing unfix without write-lock at the end of a trapping match_object.
    process_flag(scheduler,1),
    T = ets_new(foo,[public, {write_concurrency,WC}]),
    NumOfObjs = 3000,  %% Need more than 1000 live objects for match_object to trap one time
    Deleted = NumOfObjs div 2,
    filltabint(T,NumOfObjs),
    {ReaderPid, ReaderMref} = my_spawn_opt(fun()-> otp_8166_reader(T,NumOfObjs) end,
                                           [link, monitor, {scheduler,2}]),
    {ZombieCrPid, ZombieCrMref} = my_spawn_opt(fun()-> otp_8166_zombie_creator(T,Deleted) end,
                                               [link, monitor, {scheduler,3}]),

    repeat(fun() -> ZombieCrPid ! {loop, self()},
		    zombies_created = receive_any(),
		    otp_8166_trapper(T, 10, ZombieCrPid)
	   end, 100),

    ReaderPid ! quit,
    {'DOWN', ReaderMref, process, ReaderPid, normal} = receive_any(),
    ZombieCrPid ! quit,
    {'DOWN', ZombieCrMref, process, ZombieCrPid, normal} = receive_any(),
    false = ets:info(T,fixed),
    0 = get_kept_objects(T),
    %%verify_table_load(T),
    ets:delete(T),
    process_flag(scheduler,0).

%% Keep reading the table
otp_8166_reader(T, NumOfObjs) ->
    repeat_while(fun(0) ->
			 receive quit -> {false,done}
			 after 0 -> {true,NumOfObjs}
			 end;
		    (Key) ->
			 ets:lookup(T,Key),
			 {true, Key-1}
		 end,
		 NumOfObjs).

%% Do a match_object that will trap and thereby fixate and then unfixate the table
otp_8166_trapper(T, Try, ZombieCrPid) ->
    [] = ets:match_object(T,{'_',"Pink Unicorn"}),
    case {ets:info(T,fixed),Try} of
	{true,1} ->
	    io:format("failed to provoke unsafe unfix, give up...\n",[]),
	    ZombieCrPid ! unfix;
	{true,_} ->
	    io:format("trapper too fast, trying again...\n",[]),
	    otp_8166_trapper(T, Try-1, ZombieCrPid);
	{false,_} -> done
    end.


%% Fixate table and create some pseudo-deleted objects (zombies)
%% Then wait for trapper to fixate before unfixing, as we want the trappers'
%% unfix to be the one that purges the zombies.
otp_8166_zombie_creator(T,Deleted) ->
    case receive_any() of
	quit -> done;

	{loop,Pid} ->
	    filltabint(T,Deleted),
	    ets:safe_fixtable(T,true),
	    Deleted = ets:select_delete(T,[{{'$1', '_'},
					    [{'=<','$1', Deleted}],
					    [true]}]),
	    Pid ! zombies_created,
	    repeat_while(fun() -> case ets:info(T,safe_fixed_monotonic_time) of
				      {_,[_P1,_P2]} ->
					  false;
				      _ ->
					  receive unfix -> false
					  after 0 -> true
					  end
				  end
			 end),
	    ets:safe_fixtable(T,false),
	    otp_8166_zombie_creator(T,Deleted);

	unfix ->
	    io:format("ignore unfix in outer loop?\n",[]),
	    otp_8166_zombie_creator(T,Deleted)
    end.




verify_table_load(T) ->
    case ets:info(T,type) of
        ordered_set -> ok;
        _ ->
            Stats = ets:info(T,stats),
            {Buckets,AvgLen,StdDev,ExpSD,_MinLen,_MaxLen,_} = Stats,
            ok = if
                     AvgLen > 1.2 ->
                         io:format("Table overloaded: Stats=~p\n~p\n",
                                   [Stats, ets:info(T)]),
                         false;

                     Buckets>256, AvgLen < 0.47 ->
                         io:format("Table underloaded: Stats=~p\n~p\n",
                                   [Stats, ets:info(T)]),
                         false;

                     StdDev > ExpSD*2 ->
                         io:format("Too large standard deviation (poor hashing?),"
                                   " stats=~p\n~p\n",[Stats, ets:info(T)]),
                         false;

                     true ->
                         io:format("Stats = ~p\n~p\n",[Stats, ets:info(T)]),
                         ok
                 end
    end.


%% ets:select on a tree with NIL key object.
otp_8732(Config) when is_list(Config) ->
    repeat_for_all_ord_set_table_types(
      fun(Opts) ->
              KeyRange = 999,
              KeyFun = fun(K) -> integer_to_list(K) end,
              Tab = ets_new(noname,Opts, KeyRange, KeyFun),
              filltabstr(Tab, KeyRange),
              ets:insert(Tab,{[],"nasty NIL object"}),
              [] = ets:match(Tab,{'_',nomatch}) %% Will hang if bug not fixed
      end),
    ok.


%% Run concurrent select_delete (and inserts) on same table.
smp_select_delete(Config) when is_list(Config) ->
    repeat_for_opts(fun smp_select_delete_do/1,
                    [[set,ordered_set,stim_cat_ord_set],
                     read_concurrency, compressed]).

smp_select_delete_do(Opts) ->
    KeyRange = 10000,
    begin % indentation
              T = ets_new(smp_select_delete,[named_table,public,{write_concurrency,true}|Opts],
                          KeyRange),
              Mod = 17,
              Zeros = erlang:make_tuple(Mod,0),
              InitF = fun(_) -> Zeros end,
              ExecF = fun(Diffs0) ->
                              case rand:uniform(20) of
                                  1 ->
                                      Mod = 17,
                                      Eq = rand:uniform(Mod) - 1,
                                      Deleted = ets:select_delete(T,
                                                                  [{{'_', '$1'},
                                                                    [{'=:=', {'rem', '$1', Mod}, Eq}],
                                                                    [true]}]),
                                      Diffs1 = setelement(Eq+1, Diffs0,
                                                          element(Eq+1,Diffs0) - Deleted),
                                      Diffs1;
                                  _ ->
                                      Key = rand:uniform(KeyRange),
                                      Eq = Key rem Mod,
                                      case ets:insert_new(T,{Key,Key}) of
                                          true ->
                                              Diffs1 = setelement(Eq+1, Diffs0,
                                                                  element(Eq+1,Diffs0)+1),
                                              Diffs1;
                                          false -> Diffs0
                                      end
                              end
                      end,
              FiniF = fun(Result) -> Result end,
              Results = run_sched_workers(InitF,ExecF,FiniF,20000),
              TotCnts = lists:foldl(fun(Diffs, Sum) -> add_lists(Sum,tuple_to_list(Diffs)) end,
                                    lists:duplicate(Mod, 0), Results),
              io:format("TotCnts = ~p\n",[TotCnts]),
              LeftInTab = lists:foldl(fun(N,Sum) -> Sum+N end,
                                      0, TotCnts),
              io:format("LeftInTab = ~p\n",[LeftInTab]),
              LeftInTab = ets:info(T,size),
              lists:foldl(fun(Cnt,Eq) ->
                                  WasCnt = ets:select_count(T,
                                                            [{{'_', '$1'},
                                                              [{'=:=', {'rem', '$1', Mod}, Eq}],
                                                              [true]}]),
                                  io:format("~p: ~p =?= ~p\n",[Eq,Cnt,WasCnt]),
                                  Cnt = WasCnt,
                                  Eq+1
                          end,
                          0, TotCnts),
              %% May fail as select_delete does not shrink table (enough)
              %%verify_table_load(T),
              LeftInTab = ets:select_delete(T, [{{'$1','$1'}, [], [true]}]),
              0 = ets:info(T,size),
              false = ets:info(T,fixed),
              ets:delete(T)
    end, % indentation
    ok.

smp_select_replace(Config) when is_list(Config) ->
    repeat_for_opts(fun smp_select_replace_do/1,
                    [[set,ordered_set,stim_cat_ord_set,duplicate_bag],
                     compressed]).

smp_select_replace_do(Opts) ->
    KeyRange = 20,
    T = ets_new(smp_select_replace,
                [public, {write_concurrency, true} | Opts],
                KeyRange),
    InitF = fun (_) -> 0 end,
    ExecF = fun (Cnt0) ->
                    CounterId = rand:uniform(KeyRange),
                    Match = [{{'$1', '$2'},
                              [{'=:=', '$1', CounterId}],
                              [{{'$1', {'+', '$2', 1}}}]}],
                    Cnt1 = case ets:select_replace(T, Match) of
                               1 -> Cnt0+1;
                               0 ->
                                   ets:insert_new(T, {CounterId, 0}),
                                   Cnt0
                           end,
                    receive stop ->
                            [end_of_work | Cnt1]
                    after 0 ->
                            Cnt1
                    end
            end,
    FiniF = fun (Cnt) -> Cnt end,
    Pids = run_sched_workers(InitF, ExecF, FiniF, infinite),
    receive after 3*1000 -> ok end,
    [P ! stop || P <- Pids],
    Results = wait_pids(Pids),
    FinalCounts = ets:select(T, [{{'_', '$1'}, [], ['$1']}]),
    Total = lists:sum(FinalCounts),
    Total = lists:sum(Results),
    KeyRange = ets:select_delete(T, [{{'_', '_'}, [], [true]}]),
    0 = ets:info(T, size),
    true = ets:delete(T),
    ok.

%% Iterate ordered_set with write_concurrency
%% and make sure we hit all "stable" long lived keys
%% while "volatile" objects are randomly inserted and deleted.
smp_ordered_iteration(Config) when is_list(Config) ->
    repeat_for_opts(fun smp_ordered_iteration_do/1,
                    [[cat_ord_set,stim_cat_ord_set]]).


smp_ordered_iteration_do(Opts) ->
    KeyRange = 1000,
    OffHeap = erts_test_utils:mk_ext_pid({a@b,1}, 4711, 1),
    KeyFun = fun(K, Type) ->
                     {K div 10, K rem 10, Type, OffHeap}
             end,
    StimKeyFun = fun(K) ->
                         KeyFun(K, element(rand:uniform(3),
                                           {stable, other, volatile}))
                 end,
    T = ets_new(smp_ordered_iteration, [public, {write_concurrency,true} | Opts],
                KeyRange, StimKeyFun),
    NStable = KeyRange div 4,
    prefill_table(T, KeyRange, NStable, fun(K) -> {KeyFun(K, stable), 0} end),
    NStable = ets:info(T, size),
    NVolatile = KeyRange div 2,
    prefill_table(T, KeyRange, NVolatile, fun(K) -> {KeyFun(K, volatile), 0} end),

    InitF = fun (_) -> #{insert => 0, delete => 0,
                         select_delete_bk => 0, select_delete_pbk => 0,
                         select_replace_bk => 0, select_replace_pbk => 0}
            end,
    ExecF = fun (Counters) ->
                    K = rand:uniform(KeyRange),
                    Key = KeyFun(K, volatile),
                    Acc = case rand:uniform(22) of
                              R when R =< 10 ->
                                  ets:insert(T, {Key}),
                                  incr_counter(insert, Counters);
                              R when R =< 15 ->
                                  ets:delete(T, Key),
                                  incr_counter(delete, Counters);
                              R when R =< 19 ->
                                  %% Delete bound key
                                  ets:select_delete(T, [{{Key, '_'}, [], [true]}]),
                                  incr_counter(select_delete_bk, Counters);
                              R when R =< 20 ->
                                  %% Delete partially bound key
                                  ets:select_delete(T, [{{{K div 10, '_', volatile, '_'}, '_'}, [], [true]}]),
                                  incr_counter(select_delete_pbk, Counters);
                              R when R =< 21 ->
                                  %% Replace bound key
                                  ets:select_replace(T, [{{Key, '$1'}, [],
                                                          [{{{const,Key}, {'+','$1',1}}}]}]),
                                  incr_counter(select_replace_bk, Counters);
                              _ ->
                                  %% Replace partially bound key
                                  ets:select_replace(T, [{{{K div 10, '_', volatile, '_'}, '$1'}, [],
                                                          [{{{element,1,'$_'}, {'+','$1',1}}}]}]),
                                  incr_counter(select_replace_pbk, Counters)
                    end,
                    receive stop ->
                            [end_of_work | Acc]
                    after 0 ->
                            Acc
                    end
            end,
    FiniF = fun (Acc) -> Acc end,
    Pids = run_sched_workers(InitF, ExecF, FiniF, infinite),
    timer:send_after(1000, stop),

    Log2ChunkMax = math:log2(NStable*2),
    Rounds = fun Loop(N) ->
                     MS = [{{{'_', '_', stable, '_'}, '_'}, [], [true]}],
                     NStable = ets:select_count(T, MS),
                     NStable = count_stable(T, next, ets:first(T), 0),
                     NStable = count_stable(T, prev, ets:last(T), 0),
                     NStable = length(ets:select(T, MS)),
                     NStable = length(ets:select_reverse(T, MS)),
                     Chunk = round(math:pow(2, rand:uniform()*Log2ChunkMax)),
                     NStable = ets_select_chunks_count(T, MS, Chunk),
                     receive stop -> N
                     after 0 -> Loop(N+1)
                     end
             end (1),
    [P ! stop || P <- Pids],
    Results = wait_pids(Pids),
    io:format("Ops = ~p\n", [maps_sum(Results)]),
    io:format("Diff = ~p\n", [ets:info(T,size) - NStable - NVolatile]),
    io:format("Stats = ~p\n", [ets:info(T,stats)]),
    io:format("Rounds = ~p\n", [Rounds]),
    true = ets:delete(T),

    %% Verify no leakage of offheap key data
    ok = erts_test_utils:check_node_dist(),
    ok.

incr_counter(Name, Counters) ->
    Counters#{Name => maps:get(Name, Counters, 0) + 1}.

count_stable(T, Next, {_, _, stable, _}=Key, N) ->
    count_stable(T, Next, ets:Next(T, Key), N+1);
count_stable(T, Next, {_, _, volatile, _}=Key, N) ->
    count_stable(T, Next, ets:Next(T, Key), N);
count_stable(_, _, '$end_of_table', N) ->
    N.

ets_select_chunks_count(T, MS, Chunk) ->
    ets_select_chunks_count(ets:select(T, MS, Chunk), 0).

ets_select_chunks_count('$end_of_table', N) ->
    N;
ets_select_chunks_count({List, Continuation}, N) ->
    ets_select_chunks_count(ets:select(Continuation),
                           length(List) + N).

maps_sum([Ma | Tail]) when is_map(Ma) ->
    maps_sum([lists:sort(maps:to_list(Ma)) | Tail]);
maps_sum([La, Mb | Tail]) ->
    Lab = lists:zipwith(fun({K,Va}, {K,Vb}) -> {K,Va+Vb} end,
                        La,
                        lists:sort(maps:to_list(Mb))),
    maps_sum([Lab | Tail]);
maps_sum([L]) ->
    L.




%% Test different types.
types(Config) when is_list(Config) ->
    init_externals(),
    repeat_for_opts(fun types_do/1, [repeat_for_opts_atom2list(set_types),
                                     compressed]).

types_do(Opts) ->
    EtsMem = etsmem(),
    T = ets_new(xxx,Opts),
    Fun = fun(Term) ->
		  ets:insert(T,{Term}),
		  [{Term}] = ets:lookup(T,Term),
		  ets:insert(T,{Term,xxx}),
		  [{Term,xxx}] = ets:lookup(T,Term),
		  ets:insert(T,{Term,"xxx"}),
		  [{Term,"xxx"}] = ets:lookup(T,Term),
		  ets:insert(T,{xxx,Term}),
		  [{xxx,Term}] = ets:lookup(T,xxx),
		  ets:insert(T,{"xxx",Term}),
		  [{"xxx",Term}] = ets:lookup(T,"xxx"),
		  ets:delete_all_objects(T),
		  0 = ets:info(T,size)
          end,
    test_terms(Fun, strict),
    ets:delete(T),
    verify_etsmem(EtsMem).


%% OTP-9932: Memory overwrite when inserting large integers in compressed bag.
%% Will crash with segv on 64-bit opt if not fixed.
otp_9932(Config) when is_list(Config) ->
    T = ets_new(xxx, [bag, compressed]),
    Fun = fun(N) ->
		  Key = {1316110174588445 bsl N,1316110174588583 bsl N},
		  S = {Key, Key},
		  true = ets:insert(T, S),
		  [S] = ets:lookup(T, Key),
		  true = ets:insert(T, S),
		  [S] = ets:lookup(T, Key)
	  end,
    lists:foreach(Fun, lists:seq(0, 16)),
    ets:delete(T).


%% vm-deadlock caused by race between ets:delete and others on
%% write_concurrency table.
otp_9423(Config) when is_list(Config) ->
    repeat_for_all_non_stim_set_table_types(
      fun(Opts) ->
              InitF = fun(_) -> {0,0} end,
              ExecF = fun({S,F}) ->
                              receive
                                  stop ->
                                      io:format("~p got stop\n", [self()]),
                                      [end_of_work | {"Succeded=",S,"Failed=",F}]
                              after 0 ->
                                      %%io:format("~p (~p) doing lookup\n", [self(), {S,F}]),
                                      try ets:lookup(otp_9423, key) of
                                          [] -> {S+1,F}
                                      catch
                                          error:badarg -> {S,F+1}
                                      end
                              end
                      end,
              FiniF = fun(R) -> R end,
              case run_smp_workers(InitF, ExecF, FiniF, infinite, 1) of
                  Pids when is_list(Pids) ->
                      %%[P ! start || P <- Pids],
                      repeat(fun() -> ets_new(otp_9423, [named_table, public, 
                                                         {write_concurrency,true}|Opts]),
                                      ets:delete(otp_9423)
                             end, 10000),
                      [P ! stop || P <- Pids],
                      wait_pids(Pids),
                      ok;

                  Skipped -> Skipped
              end
      end).



%% Corrupted binary in compressed table
otp_10182(Config) when is_list(Config) ->
    repeat_for_opts_all_table_types(
      fun(Opts) -> 
              Bin = <<"aHR0cDovL2hvb3RzdWl0ZS5jb20vYy9wcm8tYWRyb2xsLWFi">>,
              Key = {test, Bin},
              Value = base64:decode(Bin),
              In = {Key,Value},
              Db = ets_new(undefined, Opts),
              ets:insert(Db, In),
              [Out] = ets:lookup(Db, Key),
              io:format("In :  ~p\nOut: ~p\n", [In,Out]),
              ets:delete(Db),
              In = Out
      end).

%% Test that ets:all include/exclude tables that we know are created/deleted
ets_all(Config) when is_list(Config) ->
    Pids = [spawn_link(fun() -> ets_all_run() end) || _ <- [1,2]],
    receive after 3*1000 -> ok end,
    [begin unlink(P), exit(P,kill) end || P <- Pids],
    ok.

ets_all_run() ->
    Table = ets:new(undefined, []),
    true = lists:member(Table, ets:all()),
    ets:delete(Table),
    false = lists:member(Table, ets:all()),
    ets_all_run().

create_tables(N) ->
    create_tables(N, []).

create_tables(0, Ts) ->
    Ts;
create_tables(N, Ts) ->
    create_tables(N-1, [ets:new(tjo, [])|Ts]).

massive_ets_all(Config) when is_list(Config) ->
    Me = self(),
    InitTables = lists:sort(ets:all()),
    io:format("InitTables=~p~n", [InitTables]),
    PMs0 = lists:map(fun (Sid) ->
                             my_spawn_opt(fun () ->
                                                  Ts = create_tables(250),
                                                  Me ! {self(), up, Ts},
                                                  receive {Me, die} -> ok end
                                          end,
                                          [link, monitor, {scheduler, Sid}])
                     end,
                     lists:seq(1, erlang:system_info(schedulers_online))),
    AllRes = lists:sort(lists:foldl(fun ({P, _M}, Ts) ->
                                            receive
                                                {P, up, PTs} ->
                                                    PTs ++ Ts
                                            end
                                    end,
                                    InitTables,
                                    PMs0)),
    AllRes = lists:sort(ets:all()),
    PMs1 = lists:map(fun (_) ->
                             my_spawn_opt(fun () ->
                                                  AllRes = lists:sort(ets:all())
                                          end,
                                          [link, monitor])
                     end, lists:seq(1, 50)),
    lists:foreach(fun ({P, M}) ->
                          receive
                              {'DOWN', M, process, P, _} ->
                                  ok
                          end
                  end, PMs1),
    PMs2 = lists:map(fun (_) ->
                             my_spawn_opt(fun () ->
                                                  _ = ets:all()
                                          end,
                                          [link, monitor])
                     end, lists:seq(1, 50)),
    lists:foreach(fun ({P, _M}) ->
                          P ! {Me, die}
                  end, PMs0),
    lists:foreach(fun ({P, M}) ->
                          receive
                              {'DOWN', M, process, P, _} ->
                                  ok
                          end
                  end, PMs0 ++ PMs2),
    EndTables = lists:sort(ets:all()),
    io:format("EndTables=~p~n", [EndTables]),
    InitTables = EndTables,
    ok.


take(Config) when is_list(Config) ->
    %% Simple test for set tables.
    T1 = ets_new(a, [set]),
    [] = ets:take(T1, foo),
    ets:insert(T1, {foo,bar}),
    [] = ets:take(T1, bar),
    [{foo,bar}] = ets:take(T1, foo),
    [] = ets:tab2list(T1),
    %% Non-immediate key.
    ets:insert(T1, {{'not',<<"immediate">>},ok}),
    [{{'not',<<"immediate">>},ok}] = ets:take(T1, {'not',<<"immediate">>}),
    %% Same with ordered tables.
    repeat_for_all_ord_set_table_types(
      fun(Opts) ->
              T2 = ets_new(b, Opts),
              [] = ets:take(T2, foo),
              ets:insert(T2, {foo,bar}),
              [] = ets:take(T2, bar),
              [{foo,bar}] = ets:take(T2, foo),
              [] = ets:tab2list(T2),
              ets:insert(T2, {{'not',<<"immediate">>},ok}),
              [{{'not',<<"immediate">>},ok}] = ets:take(T2, {'not',<<"immediate">>}),
              %% Arithmetically-equal keys.
              ets:insert(T2, [{1.0,float},{2,integer}]),
              [{1.0,float}] = ets:take(T2, 1),
              [{2,integer}] = ets:take(T2, 2.0),
              [] = ets:tab2list(T2),
              ets:delete(T2)
      end),
    %% Same with bag.
    T3 = ets_new(c, [bag]),
    ets:insert(T3, [{1,1},{1,2},{3,3}]),
    R = lists:sort([{1,1},{1,2}]),
    R = lists:sort(ets:take(T3, 1)),
    [{3,3}] = ets:take(T3, 3),
    [] = ets:tab2list(T3),
    ets:delete(T1),
    ets:delete(T3),
    ok.

whereis_table(Config) when is_list(Config) ->
    %% Do we return 'undefined' when the named table doesn't exist?
    undefined = ets:whereis(whereis_test),

    %% Does the tid() refer to the same table as the name?
    whereis_test = ets:new(whereis_test, [named_table]),
    Tid = ets:whereis(whereis_test),

    ets:insert(whereis_test, [{hello}, {there}]),

    [[{hello}],[{there}]] = ets:match(whereis_test, '$1'),
    [[{hello}],[{there}]] = ets:match(Tid, '$1'),

    true = ets:delete_all_objects(Tid),

    [] = ets:match(whereis_test, '$1'),
    [] = ets:match(Tid, '$1'),

    %% Does the name disappear when deleted through the tid()?
    true = ets:delete(Tid),
    undefined = ets:info(whereis_test),
    {'EXIT',{badarg, _}} = (catch ets:match(whereis_test, '$1')),

    %% Is the old tid() broken when the table is re-created with the same
    %% name?
    whereis_test = ets:new(whereis_test, [named_table]),
    [] = ets:match(whereis_test, '$1'),
    {'EXIT',{badarg, _}} = (catch ets:match(Tid, '$1')),

    ok.

ms_excessive_nesting(Config) when is_list(Config) ->
    MkMSCond = fun (_Fun, N) when N < 0 -> true;
                   (Fun, N) -> {'orelse', {'==', N, '$1'}, Fun(Fun, N-1)}
               end,
    %% Ensure it compiles with substantial but reasonable
    %% (hmm...) nesting
    MS = [{{'$1', '$2'}, [MkMSCond(MkMSCond, 100)], [{{'$1', blipp}}]}],
    io:format("~p~n", [erlang:match_spec_test({1, blupp}, MS, table)]),
    _ = ets:match_spec_compile(MS),
    %% Now test match_spec_compile() and select_replace()
    %% with tree and hash using excessive nesting. These
    %% used to seg-fault the emulator due to recursion
    %% beyond the end of the C-stack.
    %%
    %% We expect to get a system_limit error, but don't
    %% fail if it compiles (someone must have rewritten
    %% compilation of match specs to use an explicit
    %% stack instead of using recursion).
    ENMS = [{{'$1', '$2'}, [MkMSCond(MkMSCond, 1000000)], [{{'$1', blipp}}]}],
    io:format("~p~n", [erlang:match_spec_test({1, blupp}, ENMS, table)]),
    ENMSC = try
                ets:match_spec_compile(ENMS),
                "compiled"
            catch
                error:system_limit ->
                    "got system_limit"
            end,
    Tree = ets:new(tree, [ordered_set]),
    SRT = try
              ets:select_replace(Tree, ENMS),
              "compiled"
          catch
              error:system_limit ->
                  "got system_limit"
          end,
    Hash = ets:new(hash, [set]),
    SRH = try
              ets:select_replace(Hash, ENMS),
              "compiled"
          catch
              error:system_limit ->
                  "got system_limit"
          end,
    {comment, "match_spec_compile() "++ENMSC++"; select_replace(_,[ordered_set]) "++SRT++"; select_replace(_,[set]) "++SRH}.

%% The following help functions are used by
%% throughput_benchmark. They are declared on the top level beacuse
%% declaring them as function local funs cause a scalability issue.
get_op([{_,O}], _RandNum) ->
    O;
get_op([{Prob,O}|Rest], RandNum) ->
    case RandNum < Prob of
        true -> O;
        false -> get_op(Rest, RandNum)
    end.
do_op(Table, ProbHelpTab, Range, Operations) ->
    RandNum = rand:uniform(),
    Op = get_op(ProbHelpTab, RandNum),
    #{ Op := TheOp} = Operations,
    TheOp(Table, Range).
do_work(WorksDoneSoFar, Table, ProbHelpTab, Range, Operations) ->
    receive
        stop -> WorksDoneSoFar
    after
        0 -> do_op(Table, ProbHelpTab, Range, Operations),
             do_work(WorksDoneSoFar + 1, Table, ProbHelpTab, Range, Operations)
    end.

prefill_table(T, KeyRange, Num, ObjFun) ->
    Parent = self(),
    spawn_link(fun() ->
                       prefill_table_helper(T, KeyRange, Num, ObjFun),
                       Parent ! done
               end),
    receive done -> ok end.

prefill_table_helper(T, KeyRange, Num, ObjFun) ->
    Seed = rand:uniform(KeyRange),
    %%io:format("prefill_table: Seed = ~p\n", [Seed]),
    RState = unique_rand_start(KeyRange, Seed),
    prefill_table_loop(T, RState, Num, ObjFun).

prefill_table_loop(_, _, 0, _) ->
    ok;
prefill_table_loop(T, RS0, N, ObjFun) ->
    {Key, RS1} = unique_rand_next(RS0),
    ets:insert(T, ObjFun(Key)),
    prefill_table_loop(T, RS1, N-1, ObjFun).

inserter_proc_starter(T, ToInsert, Parent) ->
    receive
        start -> ok
    end,
    inserter_proc(T, ToInsert, [], Parent, false).

inserter_proc(T, [], Inserted, Parent, _) ->
    inserter_proc(T, Inserted, [], Parent, true);
inserter_proc(T, [I | ToInsert], Inserted, Parent, CanStop) ->
    Stop =
        case CanStop of
            true ->
                receive
                    stop -> Parent ! stopped
                after 0 -> no_stop
                end;
            false -> no_stop
        end,
    case Stop of
        no_stop ->
            ets:insert(T, I),
            inserter_proc(T, ToInsert, [I | Inserted], Parent, CanStop);
        _ -> ok
    end.

prefill_table_parallel(T, KeyRange, Num, ObjFun) ->
    Parent = self(),
    spawn_link(fun() ->
                       prefill_table_parallel_helper(T, KeyRange, Num, ObjFun),
                       Parent ! done
               end),
    receive done -> ok end.

prefill_table_parallel_helper(T, KeyRange, Num, ObjFun) ->
    NrOfSchedulers = erlang:system_info(schedulers),
    Seed = rand:uniform(KeyRange),
    %%io:format("prefill_table: Seed = ~p\n", [Seed]),
    RState = unique_rand_start(KeyRange, Seed),
    InsertMap = prefill_insert_map_loop(T, RState, Num, ObjFun, #{}, NrOfSchedulers),
    Self = self(),
    Pids = [
        begin
            InserterFun =
                fun() ->
                    inserter_proc_starter(T, ToInsert, Self)
                end,
            spawn_link(InserterFun)
        end
        || ToInsert <- maps:values(InsertMap)],
    [Pid ! start || Pid <- Pids],
    timer:sleep(1000),
    [Pid ! stop || Pid <- Pids],
    [receive stopped -> ok end || _Pid <- Pids].

prefill_insert_map_loop(_, _, 0, _, InsertMap, _NrOfSchedulers) ->
    InsertMap;
prefill_insert_map_loop(T, RS0, N, ObjFun, InsertMap, NrOfSchedulers) ->
    {Key, RS1} = unique_rand_next(RS0),
    Sched = N rem NrOfSchedulers,
    PrevInserts = maps:get(Sched, InsertMap, []),
    NewPrevInserts = [ObjFun(Key) | PrevInserts],
    NewInsertMap = maps:put(Sched, NewPrevInserts, InsertMap),
    prefill_insert_map_loop(T, RS1, N-1, ObjFun, NewInsertMap, NrOfSchedulers).

-record(ets_throughput_bench_config,
        {benchmark_duration_ms = 3000,
         recover_time_ms = 1000,
         thread_counts = not_set,
         key_ranges = [1000000],
         init_functions = [fun prefill_table/4],
         nr_of_repeats = 1,
         scenarios =
             [
              [
               {0.5, insert},
               {0.5, delete}
              ],
              [
               {0.1, insert},
               {0.1, delete},
               {0.8, lookup}
              ],
              [
               {0.01, insert},
               {0.01, delete},
               {0.98, lookup}
              ],
              [
               {1.0, lookup}
              ],
              [
               {0.1, insert},
               {0.1, delete},
               {0.4, lookup},
               {0.4, nextseq10}
              ],
              [
               {0.1, insert},
               {0.1, delete},
               {0.4, lookup},
               {0.4, nextseq100}
              ],
              [
               {0.1, insert},
               {0.1, delete},
               {0.4, lookup},
               {0.4, nextseq1000}
              ],
              [
               {1.0, nextseq1000}
              ],
              [
               {0.1, insert},
               {0.1, delete},
               {0.79, lookup},
               {0.01, selectAll}
              ],
              [
               {0.1, insert},
               {0.1, delete},
               {0.7999, lookup},
               {0.0001, selectAll}
              ],
              [
               {0.1, insert},
               {0.1, delete},
               {0.799999, lookup},
               {0.000001, selectAll}
              ],
              [
               {0.1, insert},
               {0.1, delete},
               {0.79, lookup},
               {0.01, partial_select1000}
              ],
              [
               {0.1, insert},
               {0.1, delete},
               {0.7999, lookup},
               {0.0001, partial_select1000}
              ],
              [
               {0.1, insert},
               {0.1, delete},
               {0.799999, lookup},
               {0.000001, partial_select1000}
              ]
             ],
         table_types =
             [
              [ordered_set, public],
              [ordered_set, public, {write_concurrency, true}],
              [ordered_set, public, {read_concurrency, true}],
              [ordered_set, public, {write_concurrency, true}, {read_concurrency, true}],
              [set, public],
              [set, public, {write_concurrency, true}],
              [set, public, {read_concurrency, true}],
              [set, public, {write_concurrency, true}, {read_concurrency, true}]
             ],
         etsmem_fun = fun() -> ok end,
         verify_etsmem_fun = fun(_) -> true end,
         notify_res_fun = fun(_Name, _Throughput) -> ok end,
         print_result_paths_fun =
             fun(ResultPath, _LatestResultPath) ->
                     Comment =
                         io_lib:format("<a href=\"file:///~s\">Result visualization</a>",[ResultPath]),
                     {comment, Comment}
             end
       }).

stdout_notify_res(ResultPath, LatestResultPath) ->
    io:format("Result Location: /~s~n", [ResultPath]),
    io:format("Latest Result Location: ~s~n", [LatestResultPath]).

throughput_benchmark() ->
    throughput_benchmark(
      #ets_throughput_bench_config{
         print_result_paths_fun = fun stdout_notify_res/2}).

throughput_benchmark(
  #ets_throughput_bench_config{
     benchmark_duration_ms  = BenchmarkDurationMs,
     recover_time_ms        = RecoverTimeMs,
     thread_counts          = ThreadCountsOpt,
     key_ranges             = KeyRanges,
     init_functions         = InitFuns,
     nr_of_repeats          = NrOfRepeats,
     scenarios              = Scenarios,
     table_types            = TableTypes,
     etsmem_fun             = ETSMemFun,
     verify_etsmem_fun      = VerifyETSMemFun,
     notify_res_fun         = NotifyResFun,
     print_result_paths_fun = PrintResultPathsFun}) ->
    NrOfSchedulers = erlang:system_info(schedulers),
    %% Definitions of operations that are supported by the benchmark
    NextSeqOp =
        fun (T, KeyRange, SeqSize) ->
                Start = rand:uniform(KeyRange),
                Last =
                    lists:foldl(
                      fun(_, Prev) ->
                              case Prev of
                                  '$end_of_table'-> ok;
                                  _ ->
                                      try ets:next(T, Prev) of
                                           Normal -> Normal
                                       catch
                                           error:badarg ->
                                               % sets (not ordered_sets) cannot handle when the argument
                                               % to next is not in the set
                                               rand:uniform(KeyRange)
                                       end
                              end
                      end,
                      Start,
                      lists:seq(1, SeqSize)),
                case Last =:= -1 of
                    true -> io:format("Will never be printed");
                    false -> ok
                end
        end,
    PartialSelectOp =
        fun (T, KeyRange, SeqSize) ->
                Start = rand:uniform(KeyRange),
                Last = Start + SeqSize,
                case -1 =:= ets:select_count(T,
                                             ets:fun2ms(fun({X}) when X > Start andalso X =< Last  -> true end)) of
                    true -> io:format("Will never be printed");
                    false -> ok
                end

        end,
    %% Mapping benchmark operation names to their corresponding functions that do them
    Operations =
        #{insert =>
              fun(T,KeyRange) ->
                      Num = rand:uniform(KeyRange),
                      ets:insert(T, {Num})
              end,
          delete =>
              fun(T,KeyRange) ->
                      Num = rand:uniform(KeyRange),
                      ets:delete(T, Num)
              end,
          lookup =>
              fun(T,KeyRange) ->
                      Num = rand:uniform(KeyRange),
                      ets:lookup(T, Num)
              end,
          nextseq10 =>
              fun(T,KeyRange) -> NextSeqOp(T,KeyRange,10) end,
          nextseq100 =>
              fun(T,KeyRange) -> NextSeqOp(T,KeyRange,100) end,
          nextseq1000 =>
              fun(T,KeyRange) -> NextSeqOp(T,KeyRange,1000) end,
          selectAll =>
              fun(T,_KeyRange) ->
                      case -1 =:= ets:select_count(T, ets:fun2ms(fun(_X) -> true end)) of
                          true -> io:format("Will never be printed");
                          false -> ok
                      end
              end,
          partial_select1000 =>
              fun(T,KeyRange) -> PartialSelectOp(T,KeyRange,1000) end
         },
    %% Helper functions
    CalculateThreadCounts = fun Calculate([Count|Rest]) ->
                                    case Count > NrOfSchedulers of
                                        true -> lists:reverse(Rest);
                                        false -> Calculate([Count*2,Count|Rest])
                                    end
                            end,
    CalculateOpsProbHelpTab =
        fun Calculate([{_, OpName}], _) ->
                [{1.0, OpName}];
            Calculate([{OpPropability, OpName}|Res], Current) ->
                NewCurrent = Current + OpPropability,
                [{NewCurrent, OpName}| Calculate(Res, NewCurrent)]
        end,
    RenderScenario =
        fun R([], StringSoFar) ->
                StringSoFar;
            R([{Fraction, Operation}], StringSoFar) ->
                io_lib:format("~s ~f% ~p",[StringSoFar, Fraction * 100.0, Operation]);
            R([{Fraction, Operation}|Rest], StringSoFar) ->
                R(Rest,
                  io_lib:format("~s ~f% ~p, ",[StringSoFar, Fraction * 100.0, Operation]))
        end,
    SafeFixTableIfRequired =
        fun(Table, Scenario, On) ->
                case set =:= ets:info(Table, type) of
                    true ->
                        HasNotRequiringOp  =
                            lists:search(
                              fun({_,nextseq10}) -> true;
                                 ({_,nextseq100}) -> true;
                                 ({_,nextseq1000}) -> true;
                                 (_) -> false
                              end, Scenario),
                        case HasNotRequiringOp of
                            false -> ok;
                            _ -> ets:safe_fixtable(Table, On)
                        end;
                    false -> ok
                end
        end,
    DataHolder =
        fun DataHolderFun(Data)->
                receive
                    {get_data, Pid} -> Pid ! {ets_bench_data, Data};
                    D -> DataHolderFun([Data,D])
                end
        end,
    DataHolderPid = spawn_link(fun()-> DataHolder([]) end),
    PrintData =
        fun (Str, List) ->
                io:format(Str, List),
                DataHolderPid ! io_lib:format(Str, List)
        end,
    GetData =
        fun () ->
                DataHolderPid ! {get_data, self()},
                receive {ets_bench_data, Data} -> Data end
        end,
    %% Function that runs a benchmark instance and returns the number
    %% of operations that were performed
    RunBenchmark =
        fun({NrOfProcs, TableConfig, Scenario, Range, Duration, InitFun}) ->
                ProbHelpTab = CalculateOpsProbHelpTab(Scenario, 0),
                Table = ets:new(t, TableConfig),
                Nobj = Range div 2,
                case InitFun of
                    not_set -> prefill_table(Table, Range, Nobj, fun(K) -> {K} end);
                    _ -> InitFun(Table, Range, Nobj, fun(K) -> {K} end)
                end,
                Nobj = ets:info(Table, size),
                SafeFixTableIfRequired(Table, Scenario, true),
                ParentPid = self(),
                Worker =
                    fun() ->
                            receive start -> ok end,
                            WorksDone =
                                do_work(0, Table, ProbHelpTab, Range, Operations),
                            ParentPid ! WorksDone
                    end,
                ChildPids =
                    lists:map(fun(_N) ->spawn_link(Worker)end, lists:seq(1, NrOfProcs)),
                erlang:garbage_collect(),
                timer:sleep(RecoverTimeMs),
                lists:foreach(fun(Pid) -> Pid ! start end, ChildPids),
                timer:sleep(Duration),
                lists:foreach(fun(Pid) -> Pid ! stop end, ChildPids),
                TotalWorksDone = lists:foldl(
                                   fun(_, Sum) ->
                                           receive
                                               Count -> Sum + Count
                                           end
                                   end, 0, ChildPids),
                SafeFixTableIfRequired(Table, Scenario, false),
                ets:delete(Table),
                TotalWorksDone
        end,
    RunBenchmarkInSepProcess =
        fun(ParameterTuple) ->
                P = self(),
                Results =
                    [begin
                         spawn_link(fun()-> P ! {bench_result, RunBenchmark(ParameterTuple)} end),
                         receive {bench_result, Res} -> Res end
                     end || _ <- lists:seq(1, NrOfRepeats)],
                lists:sum(Results) / NrOfRepeats
        end,
    RunBenchmarkAndReport =
        fun(ThreadCount,
            TableType,
            Scenario,
            KeyRange,
            Duration,
            InitFunName,
            InitFun) ->
                Result = RunBenchmarkInSepProcess({ThreadCount,
                                                   TableType,
                                                   Scenario,
                                                   KeyRange,
                                                   Duration,
                                                   InitFun}),
                Throughput = Result/(Duration/1000.0),
                PrintData("; ~f",[Throughput]),
                Name = io_lib:format("Scenario: ~s, ~w, Key Range Size: ~w, "
                                     "# of Processes: ~w, Table Type: ~w",
                                     [InitFunName, Scenario, KeyRange, ThreadCount, TableType]),
                NotifyResFun(Name, Throughput)
        end,
    ThreadCounts =
        case ThreadCountsOpt of
            not_set ->
                CalculateThreadCounts([1]);
            _ -> ThreadCountsOpt
        end,
    %% Run the benchmark
    PrintData("# Each instance of the benchmark runs for ~w seconds:~n", [BenchmarkDurationMs/1000]),
    PrintData("# The result of a benchmark instance is presented as a number representing~n",[]),
    PrintData("# the number of operations performed per second:~n~n~n",[]),
    PrintData("# To plot graphs for the results below:~n",[]),
    PrintData("# 1. Open \"$ERL_TOP/lib/stdlib/test/ets_SUITE_data/visualize_throughput.html\" in a web browser~n",[]),
    PrintData("# 2. Copy the lines between \"#BENCHMARK STARTED$\" and \"#BENCHMARK ENDED$\" below~n",[]),
    PrintData("# 3. Paste the lines copied in step 2 to the text box in the browser window opened in~n",[]),
    PrintData("#    step 1 and press the Render button~n~n",[]),
    PrintData("#BENCHMARK STARTED$~n",[]),
    EtsMem = ETSMemFun(),
    %% The following loop runs all benchmark scenarios and prints the results (i.e, operations/second)
    lists:foreach(
      fun(KeyRange) ->
              lists:foreach(
                fun(Scenario) ->
                        PrintData("Scenario: ~s | Key Range Size: ~w$~n",
                                  [RenderScenario(Scenario, ""), KeyRange]),
                        lists:foreach(
                          fun(ThreadCount) ->
                                  PrintData("; ~w",[ThreadCount])
                          end,
                          ThreadCounts),
                        PrintData("$~n",[]),
                        lists:foreach(
                          fun(TableType) ->
                                  lists:foreach(
                                    fun(InitFunArg) ->
                                            {InitFunName, InitFun} =
                                                case InitFunArg of
                                                    {FunName, Fun} -> {FunName, Fun};
                                                    Fun -> {"", Fun}
                                                end,
                                            PrintData("~s,~w ",[InitFunName,TableType]),
                                            lists:foreach(
                                              fun(ThreadCount) ->
                                                      RunBenchmarkAndReport(ThreadCount,
                                                                            TableType,
                                                                            Scenario,
                                                                            KeyRange,
                                                                            BenchmarkDurationMs,
                                                                            InitFunName,
                                                                            InitFun)
                                              end,
                                              ThreadCounts),
                                            PrintData("$~n",[])
                                    end,
                                    InitFuns)

                          end,
                          TableTypes)
                end,
                Scenarios)
      end,
      KeyRanges),
    PrintData("~n#BENCHMARK ENDED$~n~n",[]),
    VerifyETSMemFun(EtsMem),
    DataDir = filename:join(filename:dirname(code:which(?MODULE)), "ets_SUITE_data"),
    TemplatePath = filename:join(DataDir, "visualize_throughput.html"),
    {ok, Template} = file:read_file(TemplatePath),
    OutputData = string:replace(Template, "#bench_data_placeholder", GetData()),
    OutputPath1 = filename:join(DataDir, "ets_bench_result.html"),
    {{Year, Month, Day}, {Hour, Minute, Second}} = calendar:now_to_datetime(erlang:timestamp()),
    StrTime = lists:flatten(io_lib:format("~4..0w-~2..0w-~2..0wT~2..0w:~2..0w:~2..0w",[Year,Month,Day,Hour,Minute,Second])),
    OutputPath2 = filename:join(DataDir, io_lib:format("ets_bench_result_~s.html", [StrTime])),
    file:write_file(OutputPath1, OutputData),
    file:write_file(OutputPath2, OutputData),
    PrintResultPathsFun(OutputPath2, OutputPath1).

test_throughput_benchmark(Config) when is_list(Config) ->
    throughput_benchmark(
      #ets_throughput_bench_config{
         benchmark_duration_ms = 100,
         recover_time_ms = 0,
         thread_counts = [1, erlang:system_info(schedulers)],
         key_ranges = [50000],
         etsmem_fun = fun etsmem/0,
         verify_etsmem_fun = fun verify_etsmem/1}).

long_throughput_benchmark(Config) when is_list(Config) ->
    N = erlang:system_info(schedulers),
    throughput_benchmark(
      #ets_throughput_bench_config{
         benchmark_duration_ms = 3000,
         recover_time_ms = 1000,
         thread_counts = [1, N div 2, N],
         key_ranges = [1000000],
         scenarios =
             [
              [
               {0.5, insert},
               {0.5, delete}
              ],
              [
               {0.1, insert},
               {0.1, delete},
               {0.8, lookup}
              ],
              [
               {0.01, insert},
               {0.01, delete},
               {0.98, lookup}
              ],
              [
               {0.1, insert},
               {0.1, delete},
               {0.4, lookup},
               {0.4, nextseq100}
              ],
              [
               {0.1, insert},
               {0.1, delete},
               {0.79, lookup},
               {0.01, selectAll}
              ],
              [
               {0.1, insert},
               {0.1, delete},
               {0.79, lookup},
               {0.01, partial_select1000}
              ]
             ],
         table_types =
             [
              [ordered_set, public, {write_concurrency, true}, {read_concurrency, true}],
              [set, public, {write_concurrency, true}, {read_concurrency, true}]
             ],
         etsmem_fun = fun etsmem/0,
         verify_etsmem_fun = fun verify_etsmem/1,
         notify_res_fun =
             fun(Name, Throughput) ->
                     SummaryTable =
                         proplists:get_value(ets_benchmark_result_summary_tab, Config),
                     AddToSummaryCounter =
                         case SummaryTable of
                             undefined ->
                                 fun(_, _) ->
                                         ok
                                 end;
                             Tab ->
                                 fun(CounterName, ToAdd) ->
                                         OldVal = ets:lookup_element(Tab, CounterName, 2),
                                         NewVal = OldVal + ToAdd,
                                         ets:insert(Tab, {CounterName, NewVal})
                                 end
                         end,
                     Record =
                         fun(NoOfBenchsCtr, TotThrputCtr) ->
                                 AddToSummaryCounter(NoOfBenchsCtr, 1),
                                 AddToSummaryCounter(TotThrputCtr, Throughput)
                         end,
                     Record(nr_of_benchmarks, total_throughput),
                     case string:find(Name, "ordered_set") of
                         nomatch ->
                             Record(nr_of_set_benchmarks, total_throughput_set);
                         _ ->
                             Record(nr_of_ordered_set_benchmarks,
                                    total_throughput_ordered_set)
                     end,
                     ct_event:notify(
                          #event{name = benchmark_data,
                                 data = [{suite,"ets_bench"},
                                         {name, Name},
                                         {value,Throughput}]})
             end
        }).

%% This function compares the lookup operation's performance for
%% ordered_set ETS tables with and without write_concurrency enabled
%% when the data structures have been populated in parallel and
%% sequentially.
%%
%% The main purpose of this function is to check that the
%% implementation of ordered_set with write_concurrency (CA tree)
%% adapts its structure to contention even when only lookup operations
%% are used.
lookup_catree_par_vs_seq_init_benchmark() ->
    N = erlang:system_info(schedulers),
    throughput_benchmark(
      #ets_throughput_bench_config{
         benchmark_duration_ms = 600000,
         recover_time_ms = 1000,
         thread_counts = [1, N div 2, N],
         key_ranges = [1000000],
         init_functions = [{"seq_init", fun prefill_table/4},
                           {"par_init", fun prefill_table_parallel/4}],
         nr_of_repeats = 1,
         scenarios =
             [
              [
               {1.0, lookup}
              ]
             ],
         table_types =
             [
              [ordered_set, public, {write_concurrency, true}],
              [ordered_set, public]
             ],
          print_result_paths_fun = fun stdout_notify_res/2
        }).

add_lists(L1,L2) ->
    add_lists(L1,L2,[]).
add_lists([],[],Acc) ->
    lists:reverse(Acc);
add_lists([E1|T1], [E2|T2], Acc) ->
    add_lists(T1, T2, [E1+E2 | Acc]).

run_smp_workers(InitF,ExecF,FiniF,Laps) ->
    run_smp_workers(InitF,ExecF,FiniF,Laps, 0).
run_smp_workers(InitF,ExecF,FiniF,Laps, Exclude) ->
    case erlang:system_info(schedulers_online) of
        N when N > Exclude ->
            run_workers_do(InitF,ExecF,FiniF,Laps, N - Exclude);
        _ ->
            {skipped, "Too few schedulers online"}
    end.

run_sched_workers(InitF,ExecF,FiniF,Laps) ->
    run_workers_do(InitF,ExecF,FiniF,Laps,
                   erlang:system_info(schedulers)).

run_workers_do(InitF,ExecF,FiniF,Laps, NumOfProcs) ->
    io:format("starting ~p workers\n",[NumOfProcs]),
    Seeds = [{ProcN,rand:uniform(9999)} || ProcN <- lists:seq(1,NumOfProcs)],
    Parent = self(),
    Pids = [my_spawn_link(fun()-> worker(Seed,InitF,ExecF,FiniF,Laps,Parent,NumOfProcs) end)
	    || Seed <- Seeds],
    case Laps of
	infinite -> Pids;
	_ -> wait_pids(Pids)
    end.

worker({ProcN,Seed}, InitF, ExecF, FiniF, Laps, Parent, NumOfProcs) ->
    io:format("smp worker ~p, seed=~p~n",[self(),Seed]),
    rand:seed(default, {Seed,Seed,Seed}),
    State1 = InitF([ProcN, NumOfProcs]),
    State2 = worker_loop(Laps, ExecF, State1),
    Result = FiniF(State2),
    io:format("worker ~p done\n",[self()]),
    Parent ! {self(), Result}.

worker_loop(0, _, State) ->
    State;
worker_loop(_, _, [end_of_work|State]) ->
    State;
worker_loop(infinite, ExecF, State) ->
    worker_loop(infinite,ExecF,ExecF(State));
worker_loop(N, ExecF, State) ->
    worker_loop(N-1,ExecF,ExecF(State)).

wait_pids(Pids) ->
    wait_pids(Pids,[]).
wait_pids([],Acc) ->
    Acc;
wait_pids(Pids, Acc) ->
    receive
	{Pid,Result} ->
	    true = lists:member(Pid,Pids),
	    Others = lists:delete(Pid,Pids),
	    %%io:format("wait_pid got ~p from ~p\n",[Result,Pid]),
	    wait_pids(Others,[Result | Acc])
    after 60*1000 ->
	    io:format("Still waiting for workers ~p\n",[Pids]),
            wait_pids(Pids, Acc)
    end.




my_tab_to_list(Ts) ->
    Key = ets:first(Ts),
    my_tab_to_list(Ts,ets:next(Ts,Key),[ets:lookup(Ts, Key)]).

my_tab_to_list(_Ts,'$end_of_table', Acc) -> lists:reverse(Acc);
my_tab_to_list(Ts,Key, Acc) ->
    my_tab_to_list(Ts,ets:next(Ts,Key),[ets:lookup(Ts, Key)| Acc]).


wait_for_memory_deallocations() ->
    try
	erts_debug:set_internal_state(wait, thread_progress),
	erts_debug:set_internal_state(wait, deallocations)
    catch
	error:undef ->
	    erts_debug:set_internal_state(available_internal_state, true),
	    wait_for_memory_deallocations();
        error:badarg ->
            %% The emulator we run on does not have the wait internal state
            %% so we just sleep some time instead...
            timer:sleep(100)
    end.

etsmem() ->
    etsmem(get_etsmem(), 1).

etsmem(PrevEtsMem, Try) when Try < 10 ->
    case get_etsmem() of
        PrevEtsMem ->
            PrevEtsMem;
        EtsMem ->
            io:format("etsmem(): Change in attempt ~p~n~nbefore:~n~p~n~nafter:~n~p~n~n",
                      [Try, PrevEtsMem, EtsMem]),
            etsmem(EtsMem, Try+1)
    end;
etsmem(_, _) ->
    ct:fail("Failed to get a stable/consistent memory snapshot").

get_etsmem() ->
    AllTabsExceptions = [logger, code],
    %% The logger table is excluded from the AllTabs list
    %% below because it uses decentralized counters to keep
    %% track of the size and the memory counters. This cause
    %% ets:info(T,size) and ets:info(T,memory) to trigger
    %% allocations and frees that may change the amount of
    %% memory that is allocated for ETS.
    %%
    %% The code table is excluded from the list below
    %% because the amount of memory allocated for it may
    %% change if the tested code loads a new module.
    AllTabs =
        lists:sort(
          [begin
               try ets:info(T, decentralized_counters) of
                   true ->
                       ct:fail("Background ETS table (~p) that "
                               "uses decentralized counters (Add exception?)",
                               [ets:info(T,name)]);
                   _ -> ok
               catch _:_ ->
                       ok
               end,
               {T,
                ets:info(T,name),
                ets:info(T,size),
                ets:info(T,memory),
                ets:info(T,type)}
           end
           || T <- ets:all(),
              not lists:member(ets:info(T, name), AllTabsExceptions)]),
    wait_for_memory_deallocations(),
    EtsAllocSize = erts_debug:alloc_blocks_size(ets_alloc),
    ErlangMemoryEts = try erlang:memory(ets)
                      catch error:notsup -> notsup end,
    FlxCtrMemUsage = try erts_debug:get_internal_state(flxctr_memory_usage)
                     catch error:badarg -> notsup end,
    Mem = {ErlangMemoryEts, EtsAllocSize, FlxCtrMemUsage},
    {Mem, AllTabs}.

verify_etsmem(MI) ->
    wait_for_test_procs(),
    verify_etsmem(MI, 1).

verify_etsmem({MemInfo,AllTabs}, Try) ->
    case etsmem() of
	{MemInfo,_} ->
	    io:format("Ets mem info: ~p", [MemInfo]),
	    case {MemInfo, Try} of
		{{ErlMem,EtsAlloc},_} when ErlMem == notsup; EtsAlloc == undefined ->
		    %% Use 'erl +Mea max' to do more complete memory leak testing.
		    {comment,"Incomplete or no mem leak testing"};
		{_, 1} ->
                    ok;
                _ ->
                    {comment, "Transient memory discrepancy"}
	    end;

	{MemInfo2, AllTabs2} ->
	    io:format("#Expected: ~p", [MemInfo]),
	    io:format("#Actual:   ~p", [MemInfo2]),
	    io:format("#Changed tables before: ~p\n",[AllTabs -- AllTabs2]),
	    io:format("#Changed tables after: ~p\n", [AllTabs2 -- AllTabs]),
            case Try < 2 of
                true ->
                    io:format("\n#This discrepancy could be caused by an "
                              "inconsistent memory \"snapshot\""
                              "\n#Try again...\n", []),
                    verify_etsmem({MemInfo, AllTabs}, Try+1);
                false ->
                    ct:fail("Failed memory check")
            end
    end.


start_loopers(N, Prio, Fun, State) ->
    lists:map(fun (_) ->
		      my_spawn_opt(fun () -> looper(Fun, State) end,
				   [{priority, Prio}, link])
	      end,
	      lists:seq(1, N)).

stop_loopers(Loopers) ->
    lists:foreach(fun (P) ->
			  unlink(P),
			  exit(P, bang)
		  end,
		  Loopers),
    ok.

looper(Fun, State) ->
    looper(Fun, Fun(State)).

spawn_logger(Procs) ->
    receive
	{new_test_proc, Proc} ->
	    spawn_logger([Proc|Procs]);
	{sync_test_procs, Kill, From} ->
	    lists:foreach(fun (Proc) when From == Proc ->
				  ok;
			      (Proc) ->
				  Mon = erlang:monitor(process, Proc),
				  ok = receive
				      {'DOWN', Mon, _, _, _} ->
					  ok
				  after 0 ->
					  case Kill of
					      true -> exit(Proc, kill);
					      _ -> ok
					  end,
					  receive
					      {'DOWN', Mon, _, _, _} ->
						  ok
                                          after 5000 ->
						  io:format("Waiting for 'DOWN' from ~w, status=~w\n"
                                                            "info = ~p\n", [Proc,
                                                                            pid_status(Proc),
                                                                            process_info(Proc)]),
                                                  timeout
					  end
				  end
			  end, Procs),
	    From ! test_procs_synced,
	    spawn_logger([From])
    end.

pid_status(Pid) ->
    try
	erts_debug:get_internal_state({process_status, Pid})
    catch
	error:undef ->
	    erts_debug:set_internal_state(available_internal_state, true),
	    pid_status(Pid)
    end. 

start_spawn_logger() ->
    case whereis(ets_test_spawn_logger) of
	Pid when is_pid(Pid) -> true;
	_ -> register(ets_test_spawn_logger,
		      spawn_opt(fun () -> spawn_logger([]) end,
				[{priority, max}]))
    end.

%% restart_spawn_logger() ->
%%     stop_spawn_logger(),
%%     start_spawn_logger().

stop_spawn_logger() ->
    Mon = erlang:monitor(process, ets_test_spawn_logger),
    (catch exit(whereis(ets_test_spawn_logger), kill)),
    receive {'DOWN', Mon, _, _, _} -> ok end.

wait_for_test_procs() ->
    wait_for_test_procs(false).

wait_for_test_procs(Kill) ->
    ets_test_spawn_logger ! {sync_test_procs, Kill, self()},
    receive test_procs_synced -> ok end.

log_test_proc(Proc) when is_pid(Proc) ->
    ets_test_spawn_logger ! {new_test_proc, Proc},
    Proc.

my_spawn(Fun) -> log_test_proc(spawn(Fun)).

my_spawn_link(Fun) -> log_test_proc(spawn_link(Fun)).

my_spawn_opt(Fun,Opts) ->
    case spawn_opt(Fun,Opts) of
	Pid when is_pid(Pid) -> log_test_proc(Pid);
	{Pid, _} = Res when is_pid(Pid) -> log_test_proc(Pid), Res
    end.

my_spawn_monitor(Fun) ->
    Res = spawn_monitor(Fun),
    {Pid, _} = Res,
    log_test_proc(Pid),
    Res.

repeat(_Fun, 0) ->
    ok;
repeat(Fun, N) ->
    Fun(),
    repeat(Fun, N-1).

repeat_while(Fun) ->
    case Fun() of
	true -> repeat_while(Fun);
	false -> false
    end.

repeat_while(Fun, Arg0) ->
    case Fun(Arg0) of
	{true,Arg1} -> repeat_while(Fun,Arg1);
	{false,Ret} -> Ret
    end.

%% Some (but not all) permutations of List
repeat_for_permutations(Fun, List) ->
    repeat_for_permutations(Fun, List, length(List)-1).
repeat_for_permutations(Fun, List, 0) ->
    Fun(List);
repeat_for_permutations(Fun, List, N) ->
    {A,B} = lists:split(N, List),
    L1 = B++A,
    L2 = lists:reverse(L1),
    L3 = B++lists:reverse(A),
    L4 = lists:reverse(B)++A,
    Fun(L1), Fun(L2), Fun(L3), Fun(L4),
    repeat_for_permutations(Fun, List, N-1).

receive_any() ->
    receive M ->
	    io:format("Process ~p got msg ~p\n", [self(),M]),
	    M
    end.

receive_any_spinning() ->
    receive_any_spinning(1000000).
receive_any_spinning(Loops) ->
    receive_any_spinning(Loops,Loops,1).
receive_any_spinning(Loops,0,Tries) ->
    receive M ->
	    io:format("Spinning process ~p got msg ~p after ~p tries\n", [self(),M,Tries]),
	    M
    after 0 ->
	    receive_any_spinning(Loops, Loops, Tries+1)
    end;
receive_any_spinning(Loops, N, Tries) when N>0 ->
    receive_any_spinning(Loops, N-1, Tries).



spawn_monitor_with_pid(Pid, Fun) when is_pid(Pid) ->
    spawn_monitor_with_pid(Pid, Fun, 10).

spawn_monitor_with_pid(_, _, 0) ->
    failed;
spawn_monitor_with_pid(Pid, Fun, N) ->
    case my_spawn(fun()-> case self() of
			      Pid -> Fun();
			      _ -> die
			  end
		  end) of
	Pid ->
	    {Pid, erlang:monitor(process, Pid)};
	_Other ->
	    spawn_monitor_with_pid(Pid,Fun,N-1)
    end.


only_if_smp(Func) ->
    only_if_smp(2, Func).
only_if_smp(Schedulers, Func) ->
    case erlang:system_info(schedulers_online) of
	N when N < Schedulers -> {skip,"Too few schedulers online"};
	_ -> Func()
    end.

%% Copy-paste from emulator/test/binary_SUITE.erl
test_terms(Test_Func, Mode) ->
    garbage_collect(),
    Pib0 = process_info(self(),binary),

    Test_Func(atom),
    Test_Func(''),
    Test_Func('a'),
    Test_Func('ab'),
    Test_Func('abc'),
    Test_Func('abcd'),
    Test_Func('abcde'),
    Test_Func('abcdef'),
    Test_Func('abcdefg'),
    Test_Func('abcdefgh'),

    Test_Func(fun() -> ok end),
    X = id([a,{b,c},c]),
    Y = id({x,y,z}),
    Z = id(1 bsl 8*257),
    Test_Func(fun() -> X end),
    Test_Func(fun() -> {X,Y} end),
    Test_Func([fun() -> {X,Y,Z} end,
	       fun() -> {Z,X,Y} end,
	       fun() -> {Y,Z,X} end]),

    Test_Func({trace_ts,{even_bigger,{some_data,fun() -> ok end}},{1,2,3}}),
    Test_Func({trace_ts,{even_bigger,{some_data,<<1,2,3,4,5,6,7,8,9,10>>}},
	       {1,2,3}}),

    Test_Func(1),
    Test_Func(42),
    Test_Func(-23),
    Test_Func(256),
    Test_Func(25555),
    Test_Func(-3333),

    Test_Func(1.0),

    Test_Func(183749783987483978498378478393874),
    Test_Func(-37894183749783987483978498378478393874),
    Very_Big = very_big_num(),
    Test_Func(Very_Big),
    Test_Func(-Very_Big+1),

    Test_Func([]),
    Test_Func("abcdef"),
    Test_Func([a, b, 1, 2]),
    Test_Func([a|b]),

    Test_Func({}),
    Test_Func({1}),
    Test_Func({a, b}),
    Test_Func({a, b, c}),
    Test_Func(list_to_tuple(lists:seq(0, 255))),
    Test_Func(list_to_tuple(lists:seq(0, 256))),

    Test_Func(make_ref()),
    Test_Func([make_ref(), make_ref()]),

    Test_Func(make_port()),

    Test_Func(make_pid()),
    Test_Func(make_ext_pid()),
    Test_Func(make_ext_port()),
    Test_Func(make_ext_ref()),

    Bin0 = list_to_binary(lists:seq(0, 14)),
    Test_Func(Bin0),
    Bin1 = list_to_binary(lists:seq(0, ?heap_binary_size)),
    Test_Func(Bin1),
    Bin2 = list_to_binary(lists:seq(0, ?heap_binary_size+1)),
    Test_Func(Bin2),
    Bin3 = list_to_binary(lists:seq(0, 255)),
    garbage_collect(),
    Pib = process_info(self(),binary),
    Test_Func(Bin3),
    garbage_collect(),
    case Mode of
	strict -> Pib = process_info(self(),binary);
	skip_refc_check -> ok
    end,

    Test_Func(make_unaligned_sub_binary(Bin0)),
    Test_Func(make_unaligned_sub_binary(Bin1)),
    Test_Func(make_unaligned_sub_binary(Bin2)),
    Test_Func(make_unaligned_sub_binary(Bin3)),

    Test_Func(make_sub_binary(lists:seq(42, 43))),
    Test_Func(make_sub_binary([42,43,44])),
    Test_Func(make_sub_binary([42,43,44,45])),
    Test_Func(make_sub_binary([42,43,44,45,46])),
    Test_Func(make_sub_binary([42,43,44,45,46,47])),
    Test_Func(make_sub_binary([42,43,44,45,46,47,48])),
    Test_Func(make_sub_binary(lists:seq(42, 49))),
    Test_Func(make_sub_binary(lists:seq(0, 14))),
    Test_Func(make_sub_binary(lists:seq(0, ?heap_binary_size))),
    Test_Func(make_sub_binary(lists:seq(0, ?heap_binary_size+1))),
    Test_Func(make_sub_binary(lists:seq(0, 255))),

    Test_Func(make_unaligned_sub_binary(lists:seq(42, 43))),
    Test_Func(make_unaligned_sub_binary([42,43,44])),
    Test_Func(make_unaligned_sub_binary([42,43,44,45])),
    Test_Func(make_unaligned_sub_binary([42,43,44,45,46])),
    Test_Func(make_unaligned_sub_binary([42,43,44,45,46,47])),
    Test_Func(make_unaligned_sub_binary([42,43,44,45,46,47,48])),
    Test_Func(make_unaligned_sub_binary(lists:seq(42, 49))),
    Test_Func(make_unaligned_sub_binary(lists:seq(0, 14))),
    Test_Func(make_unaligned_sub_binary(lists:seq(0, ?heap_binary_size))),
    Test_Func(make_unaligned_sub_binary(lists:seq(0, ?heap_binary_size+1))),
    Test_Func(make_unaligned_sub_binary(lists:seq(0, 255))),

    %% Bit level binaries.
    Test_Func(<<1:1>>),
    Test_Func(<<2:2>>),
    Test_Func(<<42:10>>),
    Test_Func(list_to_bitstring([<<5:6>>|lists:seq(0, 255)])),

    Test_Func(F = fun(A) -> 42*A end),
    Test_Func(lists:duplicate(32, F)),

    Test_Func(FF = fun binary_SUITE:all/1),
    Test_Func(lists:duplicate(32, FF)),

    garbage_collect(),
    case Mode of
	strict -> Pib0 = process_info(self(),binary);
	skip_refc_check -> ok
    end,
    ok.

error_info(_Config) ->
    Ms = [{{'$1','$2','$3'},[],['$$']}],
    BagTab = fun(_Type) -> ets:new(table, [set,bag,private]) end,
    OneKeyTab = fun(Type) ->
                        T = ets:new(table, [Type, private]),
                        true = ets:insert(T, {one,two,3}),
                        T
                end,
    Set = fun(_Type) -> ets:new(table, [set, private]) end,
    OrderedSet = fun(_Type) -> ets:new(table, [ordered_set, private]) end,
    NamedTable = fun(Type) -> ets:new('$named_table', [Type, named_table, private]) end,
    UnownedTable = fun(Type) ->
                           Parent = self(),
                           spawn_link(fun() ->
                                              T = ets:new(table, [Type, public]),
                                              Parent ! T,
                                              receive ok -> ok end
                                      end),
                           receive T -> T end
                   end,

    L = [{delete, ['$Tab']},
         {delete, ['$Tab', no_key], [no_fail]},
         {delete_all_objects, ['$Tab'], [renamed]},
         {delete_object, ['$Tab', bad_object]},
         {delete_object, ['$Tab', {tag,non_existing}], [no_fail]},

         {file2tab, 1},                          %Not BIF.
         {file2tab, 2},                          %Not BIF.

         {first, ['$Tab']},

         {foldl, 3},                            %Not BIF.
         {foldr, 3},                            %Not BIF.

         {from_dets, 2},                        %Not BIF.

         {fun2ms, 1},                           %Not BIF.

         {give_away, ['$Tab', not_a_pid, bad_pid]},
         {give_away, ['$Tab', '$Self', already_owner], [{error_term,owner}]},
         {give_away, ['$Tab', '$Living', living_process], [only_bad_table]},
         {give_away, ['$Tab', '$Dead', dead_process]},

         {give_away, [UnownedTable, '$Living', gift_data], [{error_term,not_owner}]},

         {i, 1},                                %Not BIF.
         {i, 2},                                %Not BIF.
         {i, 3},                                %Not BIF.

         {info, ['$Tab']},
         {info, ['$Tab', invalid_item]},

         {init_table, 2},                       %Not BIF.

         {insert, ['$Tab', bad_object]},
         {insert, ['$Tab', {}]},
         {insert, ['$Tab', [a,{a,b,c}]]},
         {insert, ['$Tab', [a|b]]},
         {insert, ['$Tab', {a,b,c}], [no_fail]},
         {insert, ['$Tab', [{a,b,c}]], [no_fail]},

         {insert_new, ['$Tab', bad_object]},
         {insert_new, ['$Tab', {a,b,c}], [no_fail]},
         {insert_new, ['$Tab', [a,{a,b,c}]]},
         {insert_new, ['$Tab', [a|b]]},

         {internal_delete_all, 2},              %Internal function.
         {internal_select_delete, 2},           %Internal function.

         {is_compiled_ms, [bad_ms], [no_fail, no_table]},

         {last, ['$Tab']},

         {lookup, ['$Tab', no_key], [no_fail]},

         {lookup_element, ['$Tab', no_key, 0]},
         {lookup_element, ['$Tab', no_key, 1], [{error_term,badkey}]},
         {lookup_element, ['$Tab', no_key, bad_pos]},

         {lookup_element, [OneKeyTab, one, 4]},

         {match, [bad_continuation], [no_table]},

         {match, ['$Tab', <<1,2,3>>], [no_fail]},
         {match, ['$Tab', <<1,2,3>>, 0]},
         {match, ['$Tab', <<1,2,3>>, bad_limit]},
         {match_delete, ['$Tab', <<1,2,3>>], [no_fail,renamed]},

         {match_object, [bad_continuation], [no_table]},

         {match_object, ['$Tab', <<1,2,3>>], [no_fail]},
         {match_object, ['$Tab', <<1,2,3>>, bad_limit]},

         {match_spec_compile, [bad_match_spec], [no_table]},
         {match_spec_run, 2},                   %Not BIF.
         {match_spec_run_r, 3},                 %Internal BIF.

         {member, ['$Tab', no_key], [no_fail]},

         {new, [name, not_list], [no_table]},
         {new, [name, [a|b]], [no_table]},
         {new, [name, [a,b]], [no_table]},
         {new, [{bad,name}, [a,b]], [no_table]},

         %% For a set, ets:next/2 and ets:prev/2 fails if the key does
         %% not exist.
         {next, [Set, no_key]},
         {prev, [Set, no_key]},

         %% For an ordered set, ets:next/2 and ets:prev/2 succeeds
         %% even if the key does not exist.
         {next, [OrderedSet, no_key], [no_fail]},
         {prev, [OrderedSet, no_key], [no_fail]},

         {rename, ['$Tab', {bad,name}]},
         {rename, [NamedTable, '$named_table']},
         {rename, [NamedTable, {bad,name}]},

         {repair_continuation, 2},              %Not BIF.

         {safe_fixtable, ['$Tab', true], [no_fail]},
         {safe_fixtable, ['$Tab', not_boolean]},

         {select, [bad_continuation], [no_table]},

         {select, ['$Tab', Ms], [no_fail]},
         {select, ['$Tab', bad_match_spec]},
         {select, ['$Tab', Ms, bad_limit]},
         {select, ['$Tab', Ms, 0]},
         {select, ['$Tab', bad_match_spec, bad_limit]},
         {select, ['$Tab', bad_match_spec, 1]},

         {select_count, ['$Tab', Ms], [no_fail]},
         {select_count, ['$Tab', bad_match_spec]},

         {select_delete, ['$Tab', Ms], [no_fail,renamed]},
         {select_delete, ['$Tab', bad_match_spec], [renamed]},

         {select_replace, ['$Tab', [{{'$1','$2','$3'},[],[{{'$1','$3','$2'}}]}]], [no_fail]},
         {select_replace, ['$Tab', [{{'$1','$2','$3'},[],[{{'key_destroyed'}}]}]]},
         {select_replace, ['$Tab', bad_match_spec]},

         {select_replace, [BagTab, [{{'$1','$2','$3'},[],[{{'$1','$3','$2'}}]}]], [{error_term,table_type}]},

         {select_reverse, [bad_continuation], [no_table]},

         {select_reverse, ['$Tab', Ms], [no_fail]},
         {select_reverse, ['$Tab', bad_match_spec]},

         {select_reverse, ['$Tab', Ms, 0]},
         {select_reverse, ['$Tab', Ms, bad_limit]},
         {select_reverse, ['$Tab', bad_match_spec, bad_limit]},

         {setopts, ['$Tab', bad_opts]},

         {slot, ['$Tab', -1]},
         {slot, ['$Tab', not_an_integer]},

         {tab2file, 2},                         %Not BIF.
         {tab2file, 3},                         %Not BIF.
         {tab2list, 1},                         %Not BIF.
         {tabfile_info, 1},                     %Not BIF.
         {table, 1},                            %Not BIF.
         {table, 2},                            %Not BIF.

         {take, ['$Tab', no_key], [no_fail]},

         {test_ms, 2},                          %Not BIF.
         {to_dets, 2},                          %Not BIF.

         {update_counter, ['$Tab', no_key, 1], [{error_term,badkey}]},
         {update_counter, ['$Tab', no_key, bad_increment], [{error_term,badkey}]},
         {update_counter, ['$Tab', no_key, {1, 42}], [{error_term,badkey}]},
         {update_counter, ['$Tab', no_key, {1, bad_increment}], [{error_term,badkey}]},

         {update_counter, [OneKeyTab, one, {2, 1}]},
         {update_counter, [OneKeyTab, one, {2, bad_increment}]},
         {update_counter, [OneKeyTab, one, {3, bad_increment}]},
         {update_counter, [OneKeyTab, one, {4, 1}], [{error_term,position}]},
         {update_counter, [OneKeyTab, one, {4, bad_increment}]},

         {update_counter, [BagTab, bag_key, 1], [{error_term,table_type}]},
         {update_counter, [BagTab, bag_key, bad_increment], [{error_term,table_type}]},

         {update_counter, ['$Tab', key, 2, {key,0}], [no_fail]},
         {update_counter, ['$Tab', key, {1,42}, {key,0}], [{error_term,keypos}]},
         {update_counter, ['$Tab', key, 2, {key,not_integer}]},
         {update_counter, ['$Tab', key, 3, {key,whatever}]},

         {update_counter, ['$Tab', no_key, 1, default]},
         {update_counter, ['$Tab', no_key, bad_increment, {tag,0}]},
         {update_counter, ['$Tab', no_key, {1, bad_increment}, {tag,0}]},
         {update_counter, ['$Tab', no_key, {1, 42}, {tag,0}], [{error_term,keypos}]},
         {update_counter, ['$Tab', no_key, {2, 42}, {tag,not_integer}]},
         {update_counter, ['$Tab', no_key, {3, 42}, {tag,not_integer}], [{error_term,position}]},

         {update_counter, [OneKeyTab, one, {2, 1}, {tag,val}]},
         {update_counter, [OneKeyTab, one, {2, bad_increment}, {tag,val}]},
         {update_counter, [OneKeyTab, one, {3, bad_increment}, {tag,val}]},
         {update_counter, [OneKeyTab, one, {4, 1}, {tag,val}], [{error_term,position}]},
         {update_counter, [OneKeyTab, one, {4, bad_increment}, {tag,val}]},

         {update_element, ['$Tab', no_key, {2, new}], [no_fail]},
         {update_element, [BagTab, no_key, {2, bagged}]},
         {update_element, [OneKeyTab, one, not_tuple]},
         {update_element, [OneKeyTab, one, {0, new}]},
         {update_element, [OneKeyTab, one, {1, new}], [{error_term,keypos}]},
         {update_element, [OneKeyTab, one, {4, new}]},

         {whereis, [{bad,name}], [no_table]}
        ],
    put(errors, []),
    eval_ets_bif_errors(L),
    io:nl(),
    case lists:sort(get(errors)) of
        [] ->
            ok;
        [_|_]=Errors ->
            io:format("~p\n", [Errors]),
            ct:fail({length(Errors),errors})
    end.

eval_ets_bif_errors(L0) ->
    L1 = lists:foldl(fun({_,A}, Acc) when is_integer(A) -> Acc;
                        ({F,A}, Acc) -> [{F,A,[]}|Acc];
                        ({F,A,Opts}, Acc) -> [{F,A,Opts}|Acc]
                     end, [], L0),
    Tests = ordsets:from_list([{F,length(A)} || {F,A,_} <- L1] ++
                                  [{F,A} || {F,A} <- L0, is_integer(A)]),
    Bifs0 = [{F,A} || {F,A} <- ets:module_info(exports),
                      A =/= 0,
                      F =/= module_info],
    Bifs = ordsets:from_list(Bifs0),
    NYI = [{F,lists:duplicate(A, '*'),nyi} || {F,A} <- Bifs -- Tests],
    L = lists:sort(NYI ++ L1),

    spawn(fun() ->
                  true = register(living, self()),
                  Ref = make_ref(),
                  receive
                      Ref ->
                          ok
                  end
          end),

    do_eval_ets_bif_errors(L).

do_eval_ets_bif_errors([H|T]) ->
    case H of
        {F, Args} ->
            eval_ets_bif_errors(F, Args, []);
        {_, Args, nyi} ->
            case lists:all(fun(A) -> A =:= '*' end, Args) of
                true ->
                    store_error(nyi, H, error);
                false ->
                    store_error(bad_nyi, H, error)
            end;
        {F, Args, Opts} when is_list(Opts) ->
            case lists:member(no_table, Opts) of
                true ->
                    ets_eval_bif_errors_once(F, Args, Opts);
                false ->
                    eval_ets_bif_errors(F, Args, Opts)
            end
    end,
    do_eval_ets_bif_errors(T);
do_eval_ets_bif_errors([]) ->
    ok.

ets_eval_bif_errors_once(F, Args, Opts) ->
    MFA = {ets,F,Args},
    io:format("\n\n*** ets:~p/~p", [F,length(Args)]),

    NoFail = lists:member(no_fail, Opts),
    case ets_apply(F, Args, Opts) of
        {error,none} ->
            ok;
        {error,Info} ->
            store_error(wrong_failure_reason, MFA, Info);
        ok when NoFail ->
            ok;
        ok when not NoFail ->
            %% This ETS function was supposed to fail.
            store_error(expected_failure, MFA, ok)
    end.

eval_ets_bif_errors(F, Args0, Opts) ->
    MFA = {ets,F,Args0},
    io:format("\n\n*** ets:~p/~p", [F,length(Args0)]),

    %% Test the ETS function with a valid table argument.
    %% Test both for sets and ordered sets.
    _ = eval_ets_valid_tid(F, Args0, Opts, set),
    Args = eval_ets_valid_tid(F, Args0, Opts, ordered_set),

    %% Replace the table id with a plain ref to provoke a type error.
    BadArgs = eval_expand_bad_args(Args),
    case ets_apply(F, BadArgs, Opts) of
        {error,type} ->
            ok;
        BadIdResult ->
            store_error(bad_table_id, MFA, BadIdResult)
    end.

eval_ets_valid_tid(F, Args0, Opts, Type) ->
    MFA = {ets,F,Args0},
    Args = eval_expand_args(Args0, Type),
    case should_apply(Args, Opts) of
        false ->
            %% Applying this function will never fail.
            ok;
        true ->
            NoFail = lists:member(no_fail, Opts),
            ErrorTerm = proplists:get_value(error_term, Opts, none),
            case ets_apply(F, Args, Opts) of
                {error,ErrorTerm} when not NoFail ->
                    ok;
                {error,Info} when not NoFail ->
                    store_error(wrong_failure_reason, MFA, Info);
                {error,Info} when NoFail ->
                    store_error(expected_success, MFA, Info);
                ok when NoFail ->
                    ok;
                ok when not NoFail ->
                    %% This ETS function was supposed to fail.
                    store_error(expected_failure, MFA, ok)
            end
    end,

    %% Test the ETS function from another process to provoke an error
    %% because of missing access rights. (The table is private.)
    {Pid,Ref} = spawn_monitor(fun() -> exit(ets_apply(F, Args, Opts)) end),
    receive
        {'DOWN',Ref,process,Pid,Result} ->
            case Result of
                {error,access} ->
                    ok;
                {error,not_owner} when F =:= give_away ->
                    ok;
                {error,none} when F =:= info ->
                    ok;
                ok when F =:= info ->
                    ok;
                Other ->
                    store_error(access, MFA, Other)
            end
    end,

    %% Delete the ETS table.
    eval_delete_tab(Args),
    case ets_apply(F, Args, Opts) of
        {error,id} ->
            ok;
        ok when F =:= info ->
            %% ets:info/1,2 returns `undefined` instead of failing if the
            %% table has been deleted.
            ok;
        DeadTableResult ->
            store_error(dead_table, MFA, DeadTableResult)
    end,

    Args.

should_apply([_], _Opts) ->
    %% An ETS function with a single argument can't fail if
    %% the argument is valid.
    false;
should_apply([_,_|_], Opts) ->
    %% Applying the function on a valid table would have side effects
    %% that would cause problems down the line (e.g. successfully
    %% giving away a table).
    not lists:member(only_bad_table, Opts).

store_error(What, MFA, Wrong) ->
    put(errors, [{What,MFA,Wrong}|get(errors)]).

eval_expand_args(Args, Type) ->
    [expand_arg(A, Type) || A <- Args].

expand_arg('$Tab', Type) -> ets:new(table, [Type, private]);
expand_arg('$Self', _Type) -> self();
expand_arg('$Living', _Type) -> whereis(living);
expand_arg('$Dead', _Type) ->
    {Pid,Ref} = spawn_monitor(fun() -> ok end),
    receive
        {'DOWN',Ref,process,Pid,normal} -> Pid
    end;
expand_arg(Fun, Type) when is_function(Fun, 1) -> Fun(Type);
expand_arg(Arg, _Type) -> Arg.

eval_delete_tab(['$named_table'=H|_]) ->
    ets:delete(H);
eval_delete_tab([H|_]) when is_reference(H) ->
    ets:delete(H);
eval_delete_tab([_|T]) ->
    eval_delete_tab(T).

eval_expand_bad_args(['$named_table'|T]) ->
    [make_ref()|T];
eval_expand_bad_args([H|T]) when is_reference(H) ->
    [make_ref()|T];
eval_expand_bad_args([H|T]) ->
    [H|eval_expand_bad_args(T)].

ets_apply(F, Args, Opts) ->
    try
        apply(ets, F, Args),
        io:format("\nets:~p(~s) succeeded", [F,ets_format_args(Args)])
    catch
        C:R:Stk ->
            SF = fun(Mod, _, _) -> Mod =:= test_server end,
            Str = erl_error:format_exception(C, R, Stk, #{stack_trim_fun => SF}),
            BinStr = iolist_to_binary(Str),
            io:format("\nets:~p(~s)\n~ts", [F,ets_format_args(Args),BinStr]),

            {ets,ActualF,ActualArgs,Info} = hd(Stk),

            RE = <<"[*][*][*] argument \\d+:">>,
            case re:run(BinStr, RE, [{capture, none}]) of
                match ->
                    ok;
                nomatch ->
                    store_error(no_explanation, {ets,F,Args}, Info)
            end,

            case {ActualF,ActualArgs} of
                {F,Args} ->
                    ok;
                _ ->
                    case lists:member(renamed, Opts) of
                        true ->
                            ok;
                        false ->
                            store_error(renamed, {ets,F,length(Args)}, {ActualF,ActualArgs})
                    end
            end,
            [{error_info, ErrorInfoMap}] = Info,
            Cause = maps:get(cause, ErrorInfoMap, none),
            {error,Cause}
    end.

ets_format_args(Args) ->
    lists:join(", ", [io_lib:format("~p", [A]) || A <- Args]).

%%%
%%% Common utility functions.
%%%

id(I) -> I.

very_big_num() ->
    very_big_num(33, 1).

very_big_num(Left, Result) when Left > 0 ->
    very_big_num(Left-1, Result*256);
very_big_num(0, Result) ->
    Result.

make_port() ->
    hd(erlang:ports()).

make_pid() ->
    spawn_link(fun sleeper/0).

sleeper() ->
    receive after infinity -> ok end.

make_ext_pid() ->
    {Pid, _, _} = get(externals),
    Pid.

make_ext_port() ->
    {_, Port, _} = get(externals),
    Port.
make_ext_ref() ->
    {_, _, Ref} = get(externals),
    Ref.

init_externals() ->
    case get(externals) of
	undefined ->
	    OtherNode = {gurka@sallad, 1},
	    Res = {mk_pid(OtherNode, 7645, 8123),
		   mk_port(OtherNode, 187489773),
		   mk_ref(OtherNode, [262143, 1293964255, 3291964278])},
	    put(externals, Res);

	{_,_,_} -> ok
    end.

%%
%% Node container constructor functions
%%

-define(VERSION_MAGIC,       131).
-define(PORT_EXT,            102).
-define(PID_EXT,             103).
-define(NEW_REFERENCE_EXT,   114).

uint32_be(Uint) when is_integer(Uint), 0 =< Uint, Uint < 1 bsl 32 ->
    [(Uint bsr 24) band 16#ff,
     (Uint bsr 16) band 16#ff,
     (Uint bsr 8) band 16#ff,
     Uint band 16#ff];
uint32_be(Uint) ->
    exit({badarg, uint32_be, [Uint]}).

uint16_be(Uint) when is_integer(Uint), 0 =< Uint, Uint < 1 bsl 16 ->
    [(Uint bsr 8) band 16#ff,
     Uint band 16#ff];
uint16_be(Uint) ->
    exit({badarg, uint16_be, [Uint]}).

uint8(Uint) when is_integer(Uint), 0 =< Uint, Uint < 1 bsl 8 ->
    Uint band 16#ff;
uint8(Uint) ->
    exit({badarg, uint8, [Uint]}).

mk_pid({NodeName, Creation}, Number, Serial) when is_atom(NodeName) ->
    <<?VERSION_MAGIC, NodeNameExt/binary>> = term_to_binary(NodeName),
    mk_pid({NodeNameExt, Creation}, Number, Serial);
mk_pid({NodeNameExt, Creation}, Number, Serial) ->
    case catch binary_to_term(list_to_binary([?VERSION_MAGIC,
					      ?PID_EXT,
					      NodeNameExt,
					      uint32_be(Number),
					      uint32_be(Serial),
					      uint8(Creation)])) of
	Pid when is_pid(Pid) ->
	    Pid;
	{'EXIT', {badarg, _}} ->
	    exit({badarg, mk_pid, [{NodeNameExt, Creation}, Number, Serial]});
	Other ->
	    exit({unexpected_binary_to_term_result, Other})
    end.

mk_port({NodeName, Creation}, Number) when is_atom(NodeName) ->
    <<?VERSION_MAGIC, NodeNameExt/binary>> = term_to_binary(NodeName),
    mk_port({NodeNameExt, Creation}, Number);
mk_port({NodeNameExt, Creation}, Number) ->
    case catch binary_to_term(list_to_binary([?VERSION_MAGIC,
					      ?PORT_EXT,
					      NodeNameExt,
					      uint32_be(Number),
					      uint8(Creation)])) of
	Port when is_port(Port) ->
	    Port;
	{'EXIT', {badarg, _}} ->
	    exit({badarg, mk_port, [{NodeNameExt, Creation}, Number]});
	Other ->
	    exit({unexpected_binary_to_term_result, Other})
    end.

mk_ref({NodeName, Creation}, Numbers) when is_atom(NodeName),
					   is_integer(Creation),
					   is_list(Numbers) ->
    <<?VERSION_MAGIC, NodeNameExt/binary>> = term_to_binary(NodeName),
    mk_ref({NodeNameExt, Creation}, Numbers);
mk_ref({NodeNameExt, Creation}, Numbers) when is_binary(NodeNameExt),
					      is_integer(Creation),
					      is_list(Numbers) ->
    case catch binary_to_term(list_to_binary([?VERSION_MAGIC,
					      ?NEW_REFERENCE_EXT,
					      uint16_be(length(Numbers)),
					      NodeNameExt,
					      uint8(Creation),
					      lists:map(fun (N) ->
								uint32_be(N)
							end,
							Numbers)])) of
	Ref when is_reference(Ref) ->
	    Ref;
	{'EXIT', {badarg, _}} ->
	    exit({badarg, mk_ref, [{NodeNameExt, Creation}, Numbers]});
	Other ->
	    exit({unexpected_binary_to_term_result, Other})
    end.


make_sub_binary(Bin) when is_binary(Bin) ->
    {_,B} = split_binary(list_to_binary([0,1,3,Bin]), 3),
    B;
make_sub_binary(List) ->
    make_sub_binary(list_to_binary(List)).

make_unaligned_sub_binary(Bin0) when is_binary(Bin0) ->
    Bin1 = <<0:3,Bin0/binary,31:5>>,
    Sz = size(Bin0),
    <<0:3,Bin:Sz/binary,31:5>> = id(Bin1),
    Bin;
make_unaligned_sub_binary(List) ->
    make_unaligned_sub_binary(list_to_binary(List)).

%% Repeat test function with different combination of table options
%%       
repeat_for_opts(F) ->
    repeat_for_opts(F, [write_concurrency, read_concurrency, compressed]).

repeat_for_opts_all_table_types(F) ->
    repeat_for_opts(F, [all_types, write_concurrency, read_concurrency, compressed]).

repeat_for_opts_all_non_stim_table_types(F) ->
    repeat_for_opts(F, [all_non_stim_types, write_concurrency, read_concurrency, compressed]).

repeat_for_opts_all_set_table_types(F) ->
    repeat_for_opts(F, [set_types, write_concurrency, read_concurrency, compressed]).

repeat_for_all_set_table_types(F) ->
    repeat_for_opts(F, [set_types]).

repeat_for_all_ord_set_table_types(F) ->
    repeat_for_opts(F, [ord_set_types]).

repeat_for_all_non_stim_set_table_types(F) ->
    repeat_for_opts(F, [all_non_stim_set_types]).

repeat_for_opts_all_ord_set_table_types(F) ->
    repeat_for_opts(F, [ord_set_types, write_concurrency, read_concurrency, compressed]).

repeat_for_opts(F, OptGenList) when is_function(F, 1) ->
    repeat_for_opts(F, OptGenList, []).

repeat_for_opts(F, [], Acc) ->
    lists:foldl(fun(Opts, RV_Acc) ->
			OptList = lists:filter(fun(E) -> E =/= void end, Opts),
                        case is_redundant_opts_combo(OptList) of
                            true ->
                                %%io:format("Ignoring redundant options ~p\n",[OptList]),
                                ok;
                            false ->
                                io:format("Calling with options ~p\n",[OptList]),
                                RV = F(OptList),
                                case RV_Acc of
                                    {comment,_} -> RV_Acc;
                                    _ -> case RV of
                                             {comment,_} -> RV;
                                             _ -> [RV | RV_Acc]
                                         end
                                end
                        end
                end, [], Acc);
repeat_for_opts(F, [OptList | Tail], []) when is_list(OptList) ->
    repeat_for_opts(F, Tail, [[Opt] || Opt <- OptList]);
repeat_for_opts(F, [OptList | Tail], AccList) when is_list(OptList) ->
    repeat_for_opts(F, Tail, [[Opt|Acc] || Opt <- OptList, Acc <- AccList]);
repeat_for_opts(F, [Atom | Tail], AccList) when is_atom(Atom) ->
    repeat_for_opts(F, [repeat_for_opts_atom2list(Atom) | Tail ], AccList).

repeat_for_opts_atom2list(set_types) -> [set,ordered_set,stim_cat_ord_set,cat_ord_set];
repeat_for_opts_atom2list(ord_set_types) -> [ordered_set,stim_cat_ord_set,cat_ord_set];
repeat_for_opts_atom2list(all_types) -> [set,ordered_set,stim_cat_ord_set,cat_ord_set,bag,duplicate_bag];
repeat_for_opts_atom2list(all_non_stim_types) -> [set,ordered_set,cat_ord_set,bag,duplicate_bag];
repeat_for_opts_atom2list(all_non_stim_set_types) -> [set,ordered_set,cat_ord_set];
repeat_for_opts_atom2list(write_concurrency) -> [{write_concurrency,false},{write_concurrency,true}];
repeat_for_opts_atom2list(read_concurrency) -> [{read_concurrency,false},{read_concurrency,true}];
repeat_for_opts_atom2list(compressed) -> [void,compressed].

is_redundant_opts_combo(Opts) ->
    (lists:member(stim_cat_ord_set, Opts) orelse
     lists:member(cat_ord_set, Opts))
        andalso
    (lists:member({write_concurrency, false}, Opts) orelse
     lists:member(private, Opts) orelse
     lists:member(protected, Opts)).

%% Add fake table option with info about key range.
%% Will be consumed by ets_new and used for stim_cat_ord_set.
key_range(Opts, KeyRange) ->
    [{key_range, KeyRange} | Opts].

ets_new(Name, Opts0) ->
    {KeyRange, Opts1} = case lists:keytake(key_range, 1, Opts0) of
                            {value, {key_range, KR}, Rest1} ->
                                {KR, Rest1};
                            false ->
                                {1000*1000, Opts0}
                        end,
    ets_new(Name, Opts1, KeyRange).

ets_new(Name, Opts, KeyRange) ->
    ets_new(Name, Opts, KeyRange, fun id/1).

ets_new(Name, Opts0, KeyRange, KeyFun) ->
    {_Smp, CATree, Stimulate, RevOpts} =
        lists:foldl(fun(cat_ord_set, {Smp, false, false, Lacc}) ->
                            {Smp, Smp, false, [ordered_set | Lacc]};
                       (stim_cat_ord_set, {Smp, false, false, Lacc}) ->
                            {Smp, Smp, Smp, [ordered_set | Lacc]};
                       (Other, {Smp, CAT, STIM, Lacc}) ->
                            {Smp, CAT, STIM, [Other | Lacc]}
                    end,
                    {erlang:system_info(schedulers) > 1,false, false, []},
                    Opts0),
    Opts = lists:reverse(RevOpts),
    EtsNewHelper = 
        fun (UseOpts) ->
                case get(ets_new_opts) of
                    UseOpts ->
                        silence; %% suppress identical table opts spam
                    _ ->
                        put(ets_new_opts, UseOpts),
                        io:format("ets:new(~p, ~p)~n", [Name, UseOpts])
                end,
                ets:new(Name, UseOpts)
        end,
    case CATree andalso
        (not lists:member({write_concurrency, false}, Opts)) andalso
        (not lists:member(private, Opts)) andalso
        (not lists:member(protected, Opts)) of
        true ->
            NewOpts1 = 
                case lists:member({write_concurrency, true}, Opts) of
                    true -> Opts;
                    false -> [{write_concurrency, true}|Opts]
                end,
            NewOpts2 = 
                case lists:member(public, NewOpts1) of
                    true -> NewOpts1;
                    false -> [public|NewOpts1]
                end,
            T = EtsNewHelper(NewOpts2),
            case Stimulate of
                false -> ok;
                true -> stimulate_contention(T, KeyRange, KeyFun)
            end,
            T;
        false ->
            EtsNewHelper(Opts)
    end.

% The purpose of this function is to stimulate fine grained locking in
% tables of types ordered_set with the write_concurrency options
% turned on. The erts_debug feature 'ets_force_split' is used to easier
% generate a routing tree with fine grained locking without having to
% provoke lots of actual lock contentions.
stimulate_contention(Tid, KeyRange, KeyFun) ->
    T = case Tid of
            A when is_atom(A) -> ets:whereis(A);
            _ -> Tid
        end,
    erts_debug:set_internal_state(ets_force_split, {T, true}),
    Num = case KeyRange > 50 of
              true -> 50;
              false -> KeyRange
          end,
    Seed = rand:uniform(KeyRange),
    %%io:format("prefill_table: Seed = ~p\n", [Seed]),
    RState = unique_rand_start(KeyRange, Seed),
    stim_inserter_loop(T, RState, Num, KeyFun),
    Num = ets:info(T, size),
    ets:match_delete(T, {'$1','$1','$1'}),
    0 = ets:info(T, size),
    erts_debug:set_internal_state(ets_force_split, {T, false}),
    case ets:info(T,stats) of
        {0, _, _} ->
            io:format("No routing nodes in table?\n"
                      "Debug feature 'ets_force_split' does not seem to work.\n", []),
            ct:fail("No ets_force_split?");
        Stats ->
            io:format("stimulated ordered_set: ~p\n", [Stats])
    end.

stim_inserter_loop(_, _, 0, _) ->
    ok;
stim_inserter_loop(T, RS0, N, KeyFun) ->
    {K, RS1} = unique_rand_next(RS0),
    Key = KeyFun(K),
    ets:insert(T, {Key, Key, Key}),
    stim_inserter_loop(T, RS1, N-1, KeyFun).

do_tc(Do, Report) ->
    T1 = erlang:monotonic_time(),
    Do(),
    T2 = erlang:monotonic_time(),
    Elapsed = erlang:convert_time_unit(T2 - T1, native, millisecond),
    Report(Elapsed).

syrup_factor() ->
    case erlang:system_info(build_type) of
        valgrind -> 20;
        _ -> 1
    end.


%%
%% This is a pseudo random number generator for UNIQUE integers.
%% All integers between 1 and Max will be generated before it repeat itself.
%% It's a variant of this one using quadratic residues by Jeff Preshing:
%% http://preshing.com/20121224/how-to-generate-a-sequence-of-unique-random-integers/
%%
unique_rand_start(Max, Seed) ->
    L = lists:dropwhile(fun(P) -> P < Max end,
                        primes_3mod4()),
    [P | _] = case L of
                      [] ->
                          error("Random range too large");
                      _ ->
                          L
                  end,
    3 = P rem 4,
    {0, {Max, P, Seed}}.

unique_rand_next({N, {Max, P, Seed}=Const}) ->
    case dquad(P, N, Seed) + 1 of
        RND when RND > Max ->  % Too large, skip
            unique_rand_next({N+1, Const});
        RND ->
            {RND, {N+1, Const}}
    end.

%% A one-to-one relation between all integers 0 =< X < Prime
%% if Prime rem 4 == 3.
quad(Prime, X) ->
    Rem = X*X rem Prime,
    case 2*X < Prime of
        true ->
            Rem;
        false ->
            Prime - Rem
    end.

dquad(Prime, X, Seed) ->
    quad(Prime, (quad(Prime, X) + Seed) rem Prime).

%% Primes where P rem 4 == 3.
primes_3mod4() ->
    [103, 211, 503, 1019, 2003, 5003, 10007, 20011, 50023,
     100003, 200003, 500083, 1000003, 2000003, 5000011,
     10000019, 20000003, 50000047, 100000007].
