aboutsummaryrefslogblamecommitdiffstats
path: root/lib/mnesia/test/mnesia_test_lib.erl
blob: 182c2400849897fed0651017a19c1c3416782ca6 (plain) (tree)
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058



































































































































                                                                             
                            












                                                                      
                                  


























































































































































































































































































































































                                                                                                       
                                              



                                                                 
                                              





                                                   
                                         






































































































































































































































































































































































































































































































































































                                                                                                  
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2010. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%

%%
%%% Author: Hakan Mattsson  [email protected]
%%% Purpose: Test case support library
%%%
%%% This test suite may be run as a part of the Grand Test Suite
%%% of Erlang.  The Mnesia test suite is structured in a hierarchy.
%%% Each test case is implemented as an exported function with arity 1.
%%% Test case identifiers must have the following syntax: {Module, Function}.
%%%
%%% The driver of the test suite runs in two passes as follows:
%%% first the test case function is invoked with the atom 'suite' as
%%% single argument. The returned value is treated as a list of sub
%%% test cases. If the list of sub test cases is [] the test case
%%% function is invoked again, this time with a list of nodes as
%%% argument. If the list of sub test cases is not empty, the test
%%% case driver applies the algorithm recursively on each element
%%% in the list.
%%%
%%% All test cases are written in such a manner
%%% that they start to invoke ?acquire_nodes(X, Config)
%%% in order to prepare the test case execution. When that is
%%% done, the test machinery ensures that at least X number
%%% of nodes are connected to each other. If too few nodes was
%%% specified in the Config, the test case is skipped. If there
%%% was enough node names in the Config, X of them are selected
%%% and if some of them happens to be down they are restarted
%%% via the slave module. When all nodes are up and running a
%%% disk resident schema is created on all nodes and Mnesia is
%%% started a on all nodes. This means that all test cases may
%%% assume that Mnesia is up and running on all acquired nodes.
%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%
%%% doc(TestCases)
%%%
%%%    Generates a test spec from parts of the test case structure
%%%
%%% struct(TestCases)
%%%
%%%    Prints out the test case structure
%%%
%%% test(TestCases)
%%%
%%%    Run parts of the test suite. Uses test/2.
%%%    Reads Config from mnesia_test.config and starts them if neccessary.
%%%    Kills Mnesia and wipes out the Mnesia directories as a starter.
%%%
%%% test(TestCases, Config)
%%%
%%%    Run parts of the test suite on the given Nodes,
%%%    assuming that the nodes are up and running.
%%%    Kills Mnesia and wipes out the Mnesia directories as a starter.
%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

-module(mnesia_test_lib).
-author('[email protected]').
-export([
	 log/2,
	 log/4,
	 verbose/4,
	 default_config/0,
	 diskless/1,
	 eval_test_case/3,
	 test_driver/2,
	 test_case_evaluator/3,
	 activity_evaluator/1,
	 flush/0,
	 pick_msg/0,
	 start_activities/1,
	 start_transactions/1,
	 start_transactions/2,
	 start_sync_transactions/1,
	 start_sync_transactions/2,
	 sync_trans_tid_serial/1,
	 prepare_test_case/5,
	 select_nodes/4,
	 init_nodes/3,
	 error/4,
	 slave_start_link/0,
	 slave_start_link/1,
	 slave_sup/0,
	
	 start_mnesia/1,
	 start_mnesia/2,
	 start_appls/2,
	 start_appls/3,
	 start_wait/2,
	 storage_type/2,
	 stop_mnesia/1,
	 stop_appls/2,
	 sort/1,
	 kill_mnesia/1,
	 kill_appls/2,
	 verify_mnesia/4,
	 shutdown/0,
	 verify_replica_location/5,
	 lookup_config/2,
	 sync_tables/2,
	 remote_start/3,
	 remote_stop/1,
	 remote_kill/1,

	 reload_appls/2,

	 remote_activate_debug_fun/6,
	 do_remote_activate_debug_fun/6,

	 test/1,
	 test/2,
	 doc/1,
	 struct/1,
	 init_per_testcase/2,
	 end_per_testcase/2,
	 kill_tc/2	
	]).

-include("mnesia_test_lib.hrl").

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

%% included for test server compatibility
%% assume that all test cases only takes Config as sole argument
init_per_testcase(_Func, Config) ->
    global:register_name(mnesia_global_logger, group_leader()),
    Config.

end_per_testcase(_Func, Config) ->
    global:unregister_name(mnesia_global_logger),
    %% Nodes = select_nodes(all, Config, ?FILE, ?LINE),
    %% rpc:multicall(Nodes, mnesia, lkill, []),
    Config.

%% Use ?log(Format, Args) as wrapper
log(Format, Args, LongFile, Line) ->
    File = filename:basename(LongFile),
    Format2 = lists:concat([File, "(", Line, ")", ": ", Format]),
    log(Format2, Args).

log(Format, Args) ->
    case global:whereis_name(mnesia_global_logger) of
	undefined ->
	    io:format(user, Format, Args);
	Pid ->
	    io:format(Pid, Format, Args)
    end.

verbose(Format, Args, File, Line) ->
    Arg = mnesia_test_verbose,
    case get(Arg) of
	false ->
	    ok;
	true ->
	    log(Format, Args, File, Line);
	undefined ->
	    case init:get_argument(Arg) of
		{ok, List} when is_list(List) ->
		    case lists:last(List) of
			["true"] ->
			    put(Arg, true),
			    log(Format, Args, File, Line);
			_ ->
			    put(Arg, false),
			    ok
		    end;
		_ ->
		    put(Arg, false),
		    ok
	    end
    end.
    
-record('REASON', {file, line, desc}).

error(Format, Args, File, Line) ->
    global:send(mnesia_global_logger, {failed, File, Line}),
    Fail = #'REASON'{file = filename:basename(File),
		     line = Line,
		     desc = Args},
    case global:whereis_name(mnesia_test_case_sup) of
	undefined -> 
	    ignore;
	Pid -> 
	    Pid ! Fail
%% 	    global:send(mnesia_test_case_sup, Fail),
    end,
    log("<>ERROR<>~n" ++ Format, Args, File, Line).

storage_type(Default, Config) ->
    case diskless(Config) of
	true ->
	    ram_copies;
	false ->
	    Default
    end.

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

default_config() ->
    [{nodes, default_nodes()}].

default_nodes() ->    
    mk_nodes(3, []).

mk_nodes(0, Nodes) ->
    Nodes;
mk_nodes(N, []) ->
    mk_nodes(N - 1, [node()]);
mk_nodes(N, Nodes) when N > 0 ->
    Head = hd(Nodes),
    [Name, Host] = node_to_name_and_host(Head),
    Nodes ++ [mk_node(I, Name, Host) || I <- lists:seq(1, N)].

mk_node(N, Name, Host) ->
    list_to_atom(lists:concat([Name ++ integer_to_list(N) ++ "@" ++ Host])).
    
slave_start_link() ->
    slave_start_link(node()).

slave_start_link(Node) ->
    [Local, Host] = node_to_name_and_host(Node),
    {Mega, Sec, Micro} = erlang:now(),
    List = [Local, "_", Mega, "_", Sec, "_", Micro],
    Name = list_to_atom(lists:concat(List)),
    slave_start_link(list_to_atom(Host), Name).

slave_start_link(Host, Name) ->
    slave_start_link(Host, Name, 10).

slave_start_link(Host, Name, Retries) ->
    Debug = atom_to_list(mnesia:system_info(debug)),
    Args = "-mnesia debug " ++ Debug ++ 
	" -pa " ++
	filename:dirname(code:which(?MODULE)) ++ 
	" -pa " ++ 
	filename:dirname(code:which(mnesia)),    
    case starter(Host, Name, Args) of
	{ok, NewNode} ->
	    ?match(pong, net_adm:ping(NewNode)),
	    {ok, Cwd} = file:get_cwd(),
	    Path = code:get_path(),
	    ok = rpc:call(NewNode, file, set_cwd, [Cwd]),
	    true = rpc:call(NewNode, code, set_path, [Path]),
	    spawn_link(NewNode, ?MODULE, slave_sup, []),
	    rpc:multicall([node() | nodes()], global, sync, []),
	    {ok, NewNode};
	{error, Reason} when Retries == 0->
	    {error, Reason};
	{error, Reason} ->	    
	    io:format("Could not start slavenode ~p ~p retrying~n", 
		      [{Host, Name, Args}, Reason]),
	    timer:sleep(500),
	    slave_start_link(Host, Name, Retries - 1)
    end.

starter(Host, Name, Args) ->
    case os:type() of
	vxworks ->
	    X = test_server:start_node(Name, slave, [{args,Args}]),
	    timer:sleep(5000),
	    X;
	_ ->
	    slave:start(Host, Name, Args)
    end.

slave_sup() ->
    process_flag(trap_exit, true),
    receive
	{'EXIT', _, _} -> 
	    case os:type() of
		vxworks ->
		    erlang:halt();
		_  ->
		    ignore
	    end
    end.
    
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Index the test case structure

doc(TestCases) when is_list(TestCases) ->
    test(TestCases, suite),
    SuiteFname = "index.html",
    io:format("Generating HTML test specification to file: ~s~n",
	      [SuiteFname]),
    {ok, Fd} = file:open(SuiteFname, [write]),
    io:format(Fd, "<TITLE>Test specification for ~p</TITLE>.~n", [TestCases]),
    io:format(Fd, "<H1>Test specification for ~p</H1>~n", [TestCases]),
    io:format(Fd, "Test cases which not are implemented yet are written in <B>bold face</B>.~n~n", []),
    
    io:format(Fd, "<BR><BR>~n", []),
    io:format(Fd, "~n<DL>~n", []),
    do_doc(Fd, TestCases, []),
    io:format(Fd, "</DL>~n", []),
    file:close(Fd);
doc(TestCases) ->
    doc([TestCases]).

do_doc(Fd, [H | T], List) ->
    case H of
	{Module, TestCase} when is_atom(Module), is_atom(TestCase) ->
	    do_doc(Fd, Module, TestCase, List);
	TestCase when is_atom(TestCase), List == [] ->
	    do_doc(Fd, mnesia_SUITE, TestCase, List);
	TestCase when is_atom(TestCase) ->
	    do_doc(Fd, hd(List), TestCase, List)
    end,
    do_doc(Fd, T, List);
do_doc(_, [], _) ->
    ok.

do_doc(Fd, Module, TestCase, List) ->
    case get_suite(Module, TestCase) of
	[] ->
	    %% Implemented leaf test case
	    Head = ?flat_format("<A HREF=~p.html#~p_1>{~p, ~p}</A>}",
				[Module, TestCase, Module, TestCase]),
	    print_doc(Fd, Module, TestCase, Head);
	Suite when is_list(Suite) ->
	    %% Test suite
	    Head = ?flat_format("{~p, ~p}", [Module, TestCase]),
	    print_doc(Fd, Module, TestCase, Head),
	    io:format(Fd, "~n<DL>~n", []),
	    do_doc(Fd, Suite, [Module | List]),
	    io:format(Fd, "</DL>~n", []);
	'NYI' ->
	    %% Not yet implemented
	    Head = ?flat_format("<B>{~p, ~p}</B>", [Module, TestCase]),
	    print_doc(Fd, Module, TestCase, Head)
    end.

print_doc(Fd, Mod, Fun, Head) ->
    case catch (apply(Mod, Fun, [doc])) of
	{'EXIT', _} -> 
	    io:format(Fd, "<DT>~s</DT>~n", [Head]);
	Doc when is_list(Doc) ->
	    io:format(Fd, "<DT><U>~s</U><BR><DD>~n", [Head]),
	    print_rows(Fd, Doc),
	    io:format(Fd, "</DD><BR><BR>~n", [])
    end.

print_rows(_Fd, []) ->
    ok;
print_rows(Fd, [H | T]) when is_list(H) ->
    io:format(Fd, "~s~n", [H]),
    print_rows(Fd, T);
print_rows(Fd, [H | T]) when is_integer(H) ->
    io:format(Fd, "~s~n", [[H | T]]).

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Show the test case structure

struct(TestCases) ->
    T = test(TestCases, suite),
    struct(T, "").

struct({Module, TestCase}, Indentation)
        when is_atom(Module), is_atom(TestCase) ->
    log("~s{~p, ~p} ...~n", [Indentation, Module, TestCase]);
struct({Module, TestCase, Other}, Indentation)
        when is_atom(Module), is_atom(TestCase) ->
    log("~s{~p, ~p} ~p~n", [Indentation, Module, TestCase, Other]);
struct([], _) ->
    ok;
struct([TestCase | TestCases], Indentation) ->
    struct(TestCase, Indentation),
    struct(TestCases, Indentation);
struct({TestCase, []}, Indentation) ->
    struct(TestCase, Indentation);
struct({TestCase, SubTestCases}, Indentation) when is_list(SubTestCases) ->
    struct(TestCase, Indentation),
    struct(SubTestCases, Indentation ++ "  ").

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Execute the test cases

test(TestCases) ->
    test(TestCases, []).

test(TestCases, suite) when is_list(TestCases) ->
    test_driver(TestCases, suite);
test(TestCases, Config) when is_list(TestCases) ->
    D1 = lists:duplicate(10, $=),
    D2 =  lists:duplicate(10, $ ),
    log("~n~s TEST CASES: ~p~n ~sCONFIG: ~p~n~n", [D1, TestCases, D2, Config]),
    test_driver(TestCases, Config);
test(TestCase, Config) ->
    test([TestCase], Config).

test_driver([], _Config) ->
    [];
test_driver([T|TestCases], Config) ->
    L1 = test_driver(T, Config),
    L2 = test_driver(TestCases, Config),
    [L1|L2];
test_driver({Module, TestCases}, Config) when is_list(TestCases)->
    test_driver(default_module(Module, TestCases), Config);
test_driver({_, {Module, TestCase}}, Config) ->
    test_driver({Module, TestCase}, Config);
test_driver({Module, TestCase}, Config) ->
    Sec = timer:seconds(1) * 1000,
    case get_suite(Module, TestCase) of
	[] when Config == suite ->
	    {Module, TestCase, 'IMPL'};
	[] ->
	    log("Eval test case: ~w~n", [{Module, TestCase}]),
	    {T, Res} =
		timer:tc(?MODULE, eval_test_case, [Module, TestCase, Config]),
	    log("Tested ~w in ~w sec~n", [TestCase, T div Sec]),
	    {T div Sec, Res};
	Suite when is_list(Suite), Config == suite ->
	    Res = test_driver(default_module(Module, Suite), Config),
	    {{Module, TestCase}, Res};
	Suite when is_list(Suite) ->
	    log("Expand test case ~w~n", [{Module, TestCase}]),
	    Def = default_module(Module, Suite),
	    {T, Res} = timer:tc(?MODULE, test_driver, [Def, Config]),
	    {T div Sec, {{Module, TestCase}, Res}};
	'NYI' when Config == suite ->
	    {Module, TestCase, 'NYI'};
	'NYI' ->
      	    log("<WARNING> Test case ~w NYI~n", [{Module, TestCase}]),
	    {0, {skip, {Module, TestCase}, "NYI"}}
    end;
test_driver(TestCase, Config) ->
    DefaultModule = mnesia_SUITE,
    log("<>WARNING<> Missing module in test case identifier. "
	"{~w, ~w} assumed~n", [DefaultModule, TestCase]),
    test_driver({DefaultModule, TestCase}, Config).

default_module(DefaultModule, TestCases) when is_list(TestCases) ->
    Fun = fun(T) ->
		  case T of
		      {_, _} -> true;
		      T -> {true, {DefaultModule, T}}
		  end
	  end,
    lists:zf(Fun, TestCases).

%% Returns a list (possibly empty) or the atom 'NYI'
get_suite(Mod, Fun) ->
    case catch (apply(Mod, Fun, [suite])) of
	{'EXIT', _} -> 'NYI';
	List when is_list(List) -> List
    end.

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

eval_test_case(Mod, Fun, Config) ->
    flush(),
    global:register_name(mnesia_test_case_sup, self()),
    Flag = process_flag(trap_exit, true),
    Pid = spawn_link(?MODULE, test_case_evaluator, [Mod, Fun, [Config]]),
    R = wait_for_evaluator(Pid, Mod, Fun, Config),
    global:unregister_name(mnesia_test_case_sup),
    process_flag(trap_exit, Flag),
    R.

flush() ->
    receive Msg -> [Msg | flush()]
    after 0 -> []
    end.

wait_for_evaluator(Pid, Mod, Fun, Config) ->
    receive
	{'EXIT', Pid, {test_case_ok, _PidRes}} ->
	    Errors = flush(),
	    Res = 
		case Errors of
		    [] -> ok;
		    Errors -> failed
		end,
	    {Res, {Mod, Fun}, Errors};
	{'EXIT', Pid, {skipped, Reason}} ->
	    log("<WARNING> Test case ~w skipped, because ~p~n",
		[{Mod, Fun}, Reason]),
	    Mod:end_per_testcase(Fun, Config),
	    {skip, {Mod, Fun}, Reason};
	{'EXIT', Pid, Reason} ->
	    log("<>ERROR<> Eval process ~w exited, because ~p~n",
		[{Mod, Fun}, Reason]),
	    Mod:end_per_testcase(Fun, Config),
	    {crash, {Mod, Fun}, Reason}
    end.

test_case_evaluator(Mod, Fun, [Config]) ->
    NewConfig = Mod:init_per_testcase(Fun, Config),
    R = apply(Mod, Fun, [NewConfig]),
    Mod:end_per_testcase(Fun, NewConfig),
    exit({test_case_ok, R}).

activity_evaluator(Coordinator) ->
    activity_evaluator_loop(Coordinator),
    exit(normal).

activity_evaluator_loop(Coordinator) ->
    receive
	begin_trans ->
	    transaction(Coordinator, 0);
	{begin_trans, MaxRetries} ->
	    transaction(Coordinator, MaxRetries);
	end_trans ->
	    end_trans;
	Fun when is_function(Fun) ->
	    Coordinator ! {self(), Fun()},
	    activity_evaluator_loop(Coordinator);
%	{'EXIT', Coordinator, Reason} ->
%	    Reason;
	ExitExpr ->
%	    ?error("activity_evaluator_loop ~p ~p: exit(~p)~n}", [Coordinator, self(), ExitExpr]),
	    exit(ExitExpr)
    end.

transaction(Coordinator, MaxRetries) ->
    Fun = fun() ->
		  Coordinator ! {self(), begin_trans},
		  activity_evaluator_loop(Coordinator)
	  end,
    Coordinator ! {self(), mnesia:transaction(Fun, MaxRetries)},
    activity_evaluator_loop(Coordinator).

pick_msg() ->
    receive
	Message -> Message
    after 4000 -> timeout
    end.

start_activities(Nodes) ->
    Fun = fun(N) -> spawn_link(N, ?MODULE, activity_evaluator, [self()]) end,
    Pids = mapl(Fun, Nodes),
    {success, Pids}.

mapl(Fun, [H|T]) ->
    Res = Fun(H),
    [Res|mapl(Fun, T)];
mapl(_Fun, []) ->
    [].

diskless(Config) ->
    case lists:keysearch(diskless, 1, Config) of
	{value, {diskless, true}} -> 
	    true;
	_Else ->
	    false
    end.


start_transactions(Pids) ->
    Fun = fun(Pid) ->
		  Pid ! begin_trans,
		  ?match_receive({Pid, begin_trans})
	  end,
    mapl(Fun, Pids).

start_sync_transactions(Pids) ->
    Nodes = [node(Pid) || Pid <- Pids],
    Fun = fun(Pid) ->
		  sync_trans_tid_serial(Nodes),
		  Pid ! begin_trans,
		  ?match_receive({Pid, begin_trans})
	  end,
    mapl(Fun, Pids).


start_transactions(Pids, MaxRetries) ->
    Fun = fun(Pid) ->
		  Pid ! {begin_trans, MaxRetries},
		  ?match_receive({Pid, begin_trans})
	  end,
    mapl(Fun, Pids).

start_sync_transactions(Pids, MaxRetries) ->
    Nodes = [node(Pid) || Pid <- Pids],
    Fun = fun(Pid) ->
		  sync_trans_tid_serial(Nodes),
		  Pid ! {begin_trans, MaxRetries},
		  ?match_receive({Pid, begin_trans})
	  end,
    mapl(Fun, Pids).

sync_trans_tid_serial(Nodes) ->
    Fun = fun() -> mnesia:write_lock_table(schema) end,
    rpc:multicall(Nodes, mnesia, transaction, [Fun]).

select_nodes(N, Config, File, Line) ->
    prepare_test_case([], N, Config, File, Line).
    
prepare_test_case(Actions, N, Config, File, Line) ->
    NodeList1 = lookup_config(nodes, Config),
    NodeList2 = lookup_config(nodenames, Config), %% For testserver
    NodeList3 = append_unique(NodeList1, NodeList2),
    This = node(),
    All = [This | lists:delete(This, NodeList3)],
    Selected = pick_nodes(N, All, File, Line),
    case diskless(Config) of
	true ->
	    ok;
	false ->
	    rpc:multicall(Selected, application, set_env,[mnesia, schema_location, opt_disc])
    end,
    do_prepare(Actions, Selected, All, Config, File, Line).

do_prepare([], Selected, _All, _Config, _File, _Line) ->
    Selected;
do_prepare([{init_test_case, Appls} | Actions], Selected, All, Config, File, Line) ->
    set_kill_timer(Config),
    Started = init_nodes(Selected, File, Line),
    All2 = append_unique(Started, All),
    Alive = mnesia_lib:intersect(nodes() ++ [node()], All2),
    kill_appls(Appls, Alive),
    process_flag(trap_exit, true),
    do_prepare(Actions, Started, All2, Config, File, Line);
do_prepare([delete_schema | Actions], Selected, All, Config, File, Line) ->
    Alive = mnesia_lib:intersect(nodes() ++ [node()], All),
    case diskless(Config) of
	true ->
	    skip;
	false ->
	    Del = fun(Node) -> 
			  case mnesia:delete_schema([Node]) of
			      ok -> ok;
			      {error, {"All nodes not running",_}} -> 
				  ok;
			      Else ->
				  ?log("Delete schema error ~p ~n", [Else])
			  end
		  end,
	    lists:foreach(Del, Alive)
    end,
    do_prepare(Actions, Selected, All, Config, File, Line);
do_prepare([create_schema | Actions], Selected, All, Config, File, Line) ->
    case diskless(Config) of
	true -> 
	    skip;
	_Else ->
	    case mnesia:create_schema(Selected) of
		ok ->
		    ignore;
		BadNodes ->
		    ?fatal("Cannot create Mnesia schema on ~p~n", [BadNodes])
	    end
    end,
    do_prepare(Actions, Selected, All, Config, File, Line);
do_prepare([{start_appls, Appls} | Actions], Selected, All, Config, File, Line) ->
    case start_appls(Appls, Selected, Config) of
	[] -> ok;
	Bad -> ?fatal("Cannot start appls ~p: ~p~n", [Appls, Bad])
    end,
    do_prepare(Actions, Selected, All, Config, File, Line);
do_prepare([{reload_appls, Appls} | Actions], Selected, All, Config, File, Line) ->
    reload_appls(Appls, Selected),
    do_prepare(Actions, Selected, All, Config, File, Line).

set_kill_timer(Config) ->
    case init:get_argument(mnesia_test_timeout) of
	{ok, _ } -> ok;
	_ ->
	    Time0 = 
		case lookup_config(tc_timeout, Config) of
		    [] -> timer:minutes(5);
		    ConfigTime when is_integer(ConfigTime) -> ConfigTime
		end,
	    Mul = try 
		      test_server:timetrap_scale_factor()
		  catch _:_ -> 1 end,
	    (catch test_server:timetrap(Mul*Time0 + 1000)),
	    spawn_link(?MODULE, kill_tc, [self(),Time0*Mul])
    end.

kill_tc(Pid, Time) ->
    receive 
    after Time ->
	    case process_info(Pid) of
		undefined ->  ok;
		_ ->
		    ?error("Watchdog in test case timed out "
			   "in ~p min~n", [Time div (1000*60)]),
		    Files = mnesia_lib:dist_coredump(),
		    ?log("Cores dumped to:~n ~p~n", [Files]),
		    %% Genarate erlang crashdumps.
		    %% GenDump = fun(Node) ->
		    %% 		      File = "CRASH_" ++ atom_to_list(Node) ++ ".dump",
		    %% 		      rpc:call(Node, os, putenv, ["ERL_CRASH_DUMP", File]),
		    %% 		      rpc:cast(Node, erlang, halt, ["RemoteTimeTrap"])
		    %% 	      end,
		    %% [GenDump(Node) || Node <- nodes()],

		    %% erlang:halt("DebugTimeTrap"),
		    exit(Pid, kill)
	    end
    end.
    

append_unique([], List) -> List;
append_unique([H|R], List) -> 
    case lists:member(H, List) of
	true -> append_unique(R, List);
	false -> [H | append_unique(R, List)]
    end.

pick_nodes(all, Nodes, File, Line) ->
    pick_nodes(length(Nodes), Nodes, File, Line);
pick_nodes(N, [H | T], File, Line) when N > 0 ->
    [H | pick_nodes(N - 1, T, File, Line)]; 
pick_nodes(0, _Nodes, _File, _Line) ->
    [];
pick_nodes(N, [], File, Line) ->
    ?skip("Test case (~p(~p)) ignored: ~p nodes missing~n",
	  [File, Line, N]).
   
init_nodes([Node | Nodes], File, Line) ->
    case net_adm:ping(Node) of
	pong ->
	    [Node | init_nodes(Nodes, File, Line)];
	pang ->
	    [Name, Host] = node_to_name_and_host(Node),
	    case slave_start_link(Host, Name) of
		{ok, Node1} ->
		    Path = code:get_path(),
		    true = rpc:call(Node1, code, set_path, [Path]),
		    [Node1 | init_nodes(Nodes, File, Line)];
		Other ->
		    ?skip("Test case (~p(~p)) ignored: cannot start node ~p: ~p~n",
			  [File, Line, Node, Other])
	    end
    end;
init_nodes([], _File, _Line) ->
    [].

%% Returns [Name, Host]    
node_to_name_and_host(Node) ->
    string:tokens(atom_to_list(Node), [$@]).

lookup_config(Key,Config) ->
    case lists:keysearch(Key,1,Config) of
	{value,{Key,Val}} ->
	    Val;
	_ ->
	    []
    end.

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

start_appls(Appls, Nodes) ->
    start_appls(Appls, Nodes, [],  [schema]).
    
start_appls(Appls, Nodes, Config) ->
    start_appls(Appls, Nodes, Config, [schema]).

start_appls([Appl | Appls], Nodes, Config, Tabs) ->
    {Started, BadStarters} =
	rpc:multicall(Nodes, ?MODULE, remote_start, [Appl, Config, Nodes]),
    BadS = [{Node, Appl, Res} || {Node, Res} <- Started, Res /= ok],
    BadN = [{BadNode, Appl, bad_start} || BadNode <- BadStarters],
    Bad = BadS ++ BadN,
    case Appl of
	mnesia when Bad == [] ->
	    sync_tables(Nodes, Tabs);
	_ ->
	    ignore
    end,
    Bad ++ start_appls(Appls, Nodes, Config, Tabs);
start_appls([], _Nodes, _Config, _Tabs) ->
    [].

remote_start(mnesia, Config, Nodes) ->
    case diskless(Config) of
	true -> 
	    application_controller:set_env(mnesia, 
					   extra_db_nodes, 
					   Nodes -- [node()]),
	    application_controller:set_env(mnesia,
					   schema_location,
					   ram);
	false ->
	    application_controller:set_env(mnesia,
					   schema_location,
					   opt_disc),
	    ignore
    end,
    {node(), mnesia:start()};
remote_start(Appl, _Config, _Nodes) ->
    Res = 
	case application:start(Appl) of
	    {error, {already_started, Appl}} ->
		ok;
	    Other ->
		Other
	end,
    {node(), Res}.

%% Start Mnesia on all given nodes and wait for specified
%% tables to be accessible on each node. The atom all means
%% that we should wait for all tables to be loaded
%% 
%% Returns a list of error tuples {BadNode, mnesia, Reason}
start_mnesia(Nodes) ->
    start_appls([mnesia], Nodes).
start_mnesia(Nodes, Tabs) when is_list(Nodes) ->
    start_appls([mnesia], Nodes, [], Tabs).
    
%% Wait for the tables to be accessible from all nodes in the list
%% and that all nodes are aware of that the other nodes also ...
sync_tables(Nodes, Tabs) ->
    Res = send_wait(Nodes, Tabs, []),
    if
	Res == 	[] ->
	    mnesia:transaction(fun() -> mnesia:write_lock_table(schema) end),
	    Res;
	true ->
	    Res
    end.

send_wait([Node | Nodes], Tabs, Pids) ->
    Pid = spawn_link(Node, ?MODULE, start_wait, [self(), Tabs]),
    send_wait(Nodes, Tabs, [Pid | Pids]);
send_wait([], _Tabs, Pids) ->
    rec_wait(Pids, []).

rec_wait([Pid | Pids], BadRes) ->
    receive
	{'EXIT', Pid, R} ->
	    rec_wait(Pids, [{node(Pid), bad_wait, R} | BadRes]);
	{Pid, ok} ->
	    rec_wait(Pids, BadRes);
	{Pid, {error, R}} ->
	    rec_wait(Pids, [{node(Pid), bad_wait, R} | BadRes])
    end;
rec_wait([], BadRes) ->
    BadRes.

start_wait(Coord, Tabs) ->
    process_flag(trap_exit, true),
    Mon = whereis(mnesia_monitor),
    case catch link(Mon) of
	{'EXIT', _} ->
	    unlink(Coord),
	    Coord ! {self(), {error, {node_not_running, node()}}};
	_ ->
	    Res = start_wait_loop(Tabs),
	    unlink(Mon),
	    unlink(Coord),
	    Coord ! {self(), Res}
    end.

start_wait_loop(Tabs) ->
    receive
	{'EXIT', Pid, Reason} ->
	    {error, {start_wait, Pid, Reason}}
    after 0 ->
	    case mnesia:wait_for_tables(Tabs, timer:seconds(30)) of
		ok ->
		    verify_nodes(Tabs);
		{timeout, BadTabs} ->
		    log("<>WARNING<> Wait for tables ~p: ~p~n", [node(), Tabs]),
		    start_wait_loop(BadTabs);
		{error, Reason} ->
		    {error, {start_wait, Reason}}
	    end
    end.

verify_nodes(Tabs) ->
    verify_nodes(Tabs, 0).

verify_nodes([], _) ->
    ok;

verify_nodes([Tab| Tabs], N) ->
    ?match(X when is_atom(X), mnesia_lib:val({Tab, where_to_read})),
    Nodes = mnesia:table_info(Tab, where_to_write),
    Copies =
	mnesia:table_info(Tab, disc_copies) ++
        mnesia:table_info(Tab, disc_only_copies) ++
	mnesia:table_info(Tab, ram_copies),
    Local = mnesia:table_info(Tab, local_content),
    case Copies -- Nodes of
	[] -> 
	    verify_nodes(Tabs, 0);
	_Else when Local == true, Nodes /= [] ->
	    verify_nodes(Tabs, 0);
        Else ->
	    N2 = 
		if
		    N > 20 -> 
			log("<>WARNING<> ~w Waiting for table: ~p on ~p ~n", 
				 [node(), Tab, Else]),
			0;
		    true -> N+1
		end,	    
	    timer:sleep(500),
	    verify_nodes([Tab| Tabs], N2)
    end.


%% Nicely stop Mnesia on all given nodes
%% 
%% Returns a list of error tuples {BadNode, Reason}
stop_mnesia(Nodes) when is_list(Nodes) ->
    stop_appls([mnesia], Nodes).

stop_appls([Appl | Appls], Nodes) when is_list(Nodes) ->
    {Stopped, BadNodes} = rpc:multicall(Nodes, ?MODULE, remote_stop, [Appl]),
    BadS =[{Node, Appl, Res} || {Node, Res} <- Stopped, Res /= stopped],
    BadN =[{BadNode, Appl, bad_node} || BadNode <- BadNodes],
    BadS ++ BadN ++ stop_appls(Appls, Nodes);
stop_appls([], _Nodes) ->
    [].

remote_stop(mnesia) ->
    {node(), mnesia:stop()};
remote_stop(Appl) ->
    {node(), application:stop(Appl)}.

remote_kill([Appl | Appls]) ->
    catch Appl:lkill(),
    application:stop(Appl),
    remote_kill(Appls);
remote_kill([]) ->
    ok.

%% Abruptly kill Mnesia on all given nodes
%% Returns []
kill_appls(Appls, Nodes) when is_list(Nodes) ->
    verbose("<>WARNING<> Intentionally killing ~p: ~w...~n",
	    [Appls, Nodes], ?FILE, ?LINE),
    rpc:multicall(Nodes, ?MODULE, remote_kill, [Appls]),
    [].

kill_mnesia(Nodes) when is_list(Nodes) ->
    kill_appls([mnesia], Nodes).

reload_appls([Appl | Appls], Selected) ->
    kill_appls([Appl], Selected),
    timer:sleep(1000),
    Ok = {[ok || _N <- Selected], []},
    {Ok2temp, Empty} = rpc:multicall(Selected, application, unload, [Appl]),
    Conv = fun({error,{not_loaded,mnesia}}) -> ok; (Else) -> Else end,
    Ok2 = {lists:map(Conv, Ok2temp), Empty},

    Ok3 = rpc:multicall(Selected, application, load, [Appl]),
    if
	Ok /= Ok2 ->
	    ?fatal("Cannot unload appl ~p: ~p~n", [Appl, Ok2]);
	Ok /= Ok3 ->
	    ?fatal("Cannot load appl ~p: ~p~n", [Appl, Ok3]);
	true ->
	    ok
    end,
    reload_appls(Appls, Selected);
reload_appls([], _Selected) ->
    ok.

shutdown() ->
    log("<>WARNING<> Intentionally shutting down all nodes... ~p~n",
	 [nodes() ++ [node()]]),
    rpc:multicall(nodes(), erlang, halt, []),
    erlang:halt().

verify_mnesia(Ups, Downs, File, Line) when is_list(Ups), is_list(Downs) ->
    BadUps =
	[N || N <- Ups, rpc:call(N, mnesia, system_info, [is_running]) /= yes],
    BadDowns =
	[N || N <- Downs, rpc:call(N, mnesia, system_info, [is_running]) == yes],
    if
	BadUps == [] ->
	    ignore;
	true ->
	    error("Mnesia is not running as expected: ~p~n",
		  [BadUps], File, Line)
    end,
    if
	BadDowns == [] ->
	    ignore;
	true ->
	    error("Mnesia is not stopped as expected: ~p~n",
		  [BadDowns], File, Line)
    end,
    ok.

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

verify_replica_location(Tab, [], [], [], _) ->
    ?match({'EXIT', _}, mnesia:table_info(Tab, ram_copies)),
    ?match({'EXIT', _}, mnesia:table_info(Tab, disc_copies)),
    ?match({'EXIT', _}, mnesia:table_info(Tab, disc_only_copies)),
    ?match({'EXIT', _}, mnesia:table_info(Tab, where_to_write)),
    ?match({'EXIT', _}, mnesia:table_info(Tab, where_to_read)),
    [];

verify_replica_location(Tab, DiscOnly0, Ram0, Disc0, AliveNodes0) ->
%%    sync_tables(AliveNodes0, [Tab]),
    AliveNodes = lists:sort(AliveNodes0),
    DiscOnly = lists:sort(DiscOnly0),
    Ram = lists:sort(Ram0),
    Disc = lists:sort(Disc0),
    Write = ignore_dead(DiscOnly ++ Ram ++ Disc, AliveNodes),
    Read = ignore_dead(DiscOnly ++ Ram ++ Disc, AliveNodes),
    This = node(),

    timer:sleep(100), 

    S1 = ?match(AliveNodes, lists:sort(mnesia:system_info(running_db_nodes))),
    S2 = ?match(DiscOnly, lists:sort(mnesia:table_info(Tab, disc_only_copies))),
    S3 = ?match(Ram, lists:sort(mnesia:table_info(Tab, ram_copies))),
    S4 = ?match(Disc, lists:sort(mnesia:table_info(Tab, disc_copies))),
    S5 = ?match(Write, lists:sort(mnesia:table_info(Tab, where_to_write))),
    S6 = case lists:member(This, Read) of
	     true ->
		 ?match(This, mnesia:table_info(Tab, where_to_read));
	     false ->
		 ?match(true, lists:member(mnesia:table_info(Tab, where_to_read), Read))
	 end,
    lists:filter(fun({success,_}) -> false; (_) -> true end, [S1,S2,S3,S4,S5,S6]).

ignore_dead(Nodes, AliveNodes) ->
    Filter = fun(Node) -> lists:member(Node, AliveNodes) end,
    lists:sort(lists:zf(Filter, Nodes)).


remote_activate_debug_fun(N, I, F, C, File, Line) ->
    Pid = spawn_link(N, ?MODULE, do_remote_activate_debug_fun, [self(), I, F, C, File, Line]),
    receive
	{activated, Pid} -> ok;
	{'EXIT', Pid, Reason} -> {error, Reason}
    end.

do_remote_activate_debug_fun(From, I, F, C, File, Line) ->
    mnesia_lib:activate_debug_fun(I, F, C, File, Line),
    From ! {activated, self()},
    timer:sleep(infinity).  % Dies whenever the test process dies !!


sort(L) when is_list(L) -> 
    lists:sort(L);
sort({atomic, L}) when is_list(L) ->
    {atomic, lists:sort(L)};
sort({ok, L}) when is_list(L) ->
    {ok, lists:sort(L)};
sort(W) ->
    W.