aboutsummaryrefslogblamecommitdiffstats
path: root/lib/stdlib/test/gen_server_SUITE.erl
blob: c64674246e3f7f487e623328f07d9586f452a0d5 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
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

                   


                                                        




                                                                      
  



                                                                         
  



                          
                                                    

                                        
                                                   
 
                                                                                                       





                                                                           
                                                                   
                                                              










                                                            
                                                       
 

                                                












                                                         





                         





                                     





                                              
                                  























































































































































































































































































































































































































































































































































































































































































































































































































                                                                                                         
                                                                       


































                                                                                







                                                                        
                                                             





                                                                              





















                                                                                

       




























                                                                         






































                                                            
 






























































































































































                                                                             



                                            
%%
%% %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%
%%
-module(gen_server_SUITE).

-include_lib("test_server/include/test_server.hrl").
-include_lib("kernel/include/inet.hrl").

-export([init_per_testcase/2, end_per_testcase/2]).

-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1, init_per_group/2,end_per_group/2]).
-export([start/1, crash/1, call/1, cast/1, cast_fast/1,
	 info/1, abcast/1, multicall/1, multicall_down/1,
	 call_remote1/1, call_remote2/1, call_remote3/1,
	 call_remote_n1/1, call_remote_n2/1, call_remote_n3/1, spec_init/1,
	 spec_init_local_registered_parent/1, 
	 spec_init_global_registered_parent/1,
	 otp_5854/1, hibernate/1, otp_7669/1, call_format_status/1,
	 error_format_status/1, call_with_huge_message_queue/1
	]).

% spawn export
-export([spec_init_local/2, spec_init_global/2, 
	 spec_init_default_timeout/2, spec_init_anonymous/1,
	 spec_init_anonymous_default_timeout/1,
	 spec_init_not_proc_lib/1, cast_fast_messup/0]).


% The gen_server behaviour
-export([init/1, handle_call/3, handle_cast/2,
	 handle_info/2, terminate/2, format_status/2]).

suite() -> [{suite_callbacks,[ts_install_scb]}].

all() -> 
[start, crash, call, cast, cast_fast, info, abcast,
 multicall, multicall_down, call_remote1, call_remote2,
 call_remote3, call_remote_n1, call_remote_n2,
 call_remote_n3, spec_init,
 spec_init_local_registered_parent,
 spec_init_global_registered_parent, otp_5854, hibernate,
 otp_7669, call_format_status, error_format_status,
 call_with_huge_message_queue].

groups() -> 
    [].

init_per_suite(Config) ->
    Config.

end_per_suite(_Config) ->
    ok.

init_per_group(_GroupName, Config) ->
	Config.

end_per_group(_GroupName, Config) ->
	Config.


-define(default_timeout, ?t:minutes(1)).
 
init_per_testcase(_Case, Config) ->
    ?line Dog = ?t:timetrap(?default_timeout),
    [{watchdog, Dog} | Config].
end_per_testcase(_Case, Config) ->
    Dog = ?config(watchdog, Config),
    test_server:timetrap_cancel(Dog),
    ok.


%% --------------------------------------
%% Start and stop a gen_server.
%% --------------------------------------

start(suite) -> [];
start(Config) when is_list(Config) ->
    OldFl = process_flag(trap_exit, true),

    %% anonymous
    ?line {ok, Pid0} = gen_server:start(gen_server_SUITE, [], []),
    ?line ok = gen_server:call(Pid0, started_p),
    ?line ok = gen_server:call(Pid0, stop),
    ?line busy_wait_for_process(Pid0,600),
    ?line {'EXIT', {noproc,_}} = (catch gen_server:call(Pid0, started_p, 1)),

    %% anonymous with timeout
    ?line {ok, Pid00} = gen_server:start(gen_server_SUITE, [],
					 [{timeout,1000}]),
    ?line ok = gen_server:call(Pid00, started_p),
    ?line ok = gen_server:call(Pid00, stop),
    ?line {error, timeout} = gen_server:start(gen_server_SUITE, sleep,
					      [{timeout,100}]),

    %% anonymous with ignore
    ?line ignore = gen_server:start(gen_server_SUITE, ignore, []),

    %% anonymous with stop
    ?line {error, stopped} = gen_server:start(gen_server_SUITE, stop, []),

    %% anonymous linked
    ?line {ok, Pid1} =
	gen_server:start_link(gen_server_SUITE, [], []),
    ?line ok = gen_server:call(Pid1, started_p),
    ?line ok = gen_server:call(Pid1, stop),
    ?line receive
	      {'EXIT', Pid1, stopped} ->
		  ok
	  after 5000 ->
		  test_server:fail(not_stopped)
	  end,

    %% local register
    ?line {ok, Pid2} =
	gen_server:start({local, my_test_name},
			 gen_server_SUITE, [], []),
    ?line ok = gen_server:call(my_test_name, started_p),
    ?line {error, {already_started, Pid2}} =
	gen_server:start({local, my_test_name},
			 gen_server_SUITE, [], []),
    ?line ok = gen_server:call(my_test_name, stop),

    ?line busy_wait_for_process(Pid2,600),

    ?line {'EXIT', {noproc,_}} = (catch gen_server:call(Pid2, started_p, 10)),

    %% local register linked
    ?line {ok, Pid3} =
	gen_server:start_link({local, my_test_name},
			      gen_server_SUITE, [], []), 
    ?line ok = gen_server:call(my_test_name, started_p),
    ?line {error, {already_started, Pid3}} =
	gen_server:start({local, my_test_name},
			 gen_server_SUITE, [], []),
    ?line ok = gen_server:call(my_test_name, stop),
    ?line receive
	      {'EXIT', Pid3, stopped} ->
		  ok
	  after 5000 ->
		  test_server:fail(not_stopped)
	  end,

    %% global register
    ?line {ok, Pid4} =
	gen_server:start({global, my_test_name},
			 gen_server_SUITE, [], []),
    ?line ok = gen_server:call({global, my_test_name}, started_p),
    ?line {error, {already_started, Pid4}} =
	gen_server:start({global, my_test_name},
			 gen_server_SUITE, [], []),
    ?line ok = gen_server:call({global, my_test_name}, stop),
    test_server:sleep(1),
    ?line {'EXIT', {noproc,_}} = (catch gen_server:call(Pid4, started_p, 10)),

    %% global register linked
    ?line {ok, Pid5} =
	gen_server:start_link({global, my_test_name},
			      gen_server_SUITE, [], []), 
    ?line ok = gen_server:call({global, my_test_name}, started_p),
    ?line {error, {already_started, Pid5}} =
	gen_server:start({global, my_test_name},
			 gen_server_SUITE, [], []),
    ?line ok = gen_server:call({global, my_test_name}, stop),
    ?line receive
	      {'EXIT', Pid5, stopped} ->
		  ok
	  after 5000 ->
		  test_server:fail(not_stopped)
	  end,

    test_server:messages_get(),

    %% Must wait for all error messages before going to next test.
    %% (otherwise it interferes too much with real time characteristics).
    case os:type() of
	vxworks ->
	    receive after 5000 -> ok end;
	_ ->
	    ok
    end,
    process_flag(trap_exit, OldFl),
    ok.

crash(Config) when is_list(Config) ->
    ?line error_logger_forwarder:register(),

    process_flag(trap_exit, true),

    %% This crash should not generate a crash report.
    ?line {ok,Pid0} = gen_server:start_link(?MODULE, [], []),
    ?line {'EXIT',{{shutdown,reason},_}} =
 	(catch gen_server:call(Pid0, shutdown_reason)),
    receive {'EXIT',Pid0,{shutdown,reason}} -> ok end,

    %% This crash should not generate a crash report.
    ?line {ok,Pid1} = gen_server:start_link(?MODULE, {state,state1}, []),
    ?line {'EXIT',{{shutdown,stop_reason},_}} =
	(catch gen_server:call(Pid1, stop_shutdown_reason)),
    receive {'EXIT',Pid1,{shutdown,stop_reason}} -> ok end,

    %% This crash should not generate a crash report.
    ?line {ok,Pid2} = gen_server:start_link(?MODULE, [], []),
    ?line {'EXIT',{shutdown,_}} =
 	(catch gen_server:call(Pid2, exit_shutdown)),
    receive {'EXIT',Pid2,shutdown} -> ok end,

    %% This crash should not generate a crash report.
    ?line {ok,Pid3} = gen_server:start_link(?MODULE, {state,state3}, []),
    ?line {'EXIT',{shutdown,_}} =
	(catch gen_server:call(Pid3, stop_shutdown)),
    receive {'EXIT',Pid3,shutdown} -> ok end,

    process_flag(trap_exit, false),

    %% This crash should generate a crash report and a report
    %% from gen_server.
    ?line {ok,Pid4} = gen_server:start(?MODULE, {state,state4}, []),
    ?line {'EXIT',{crashed,_}} = (catch gen_server:call(Pid4, crash)),
    receive
	{error,_GroupLeader4,{Pid4,
			      "** Generic server"++_,
			      [Pid4,crash,state4,crashed]}} ->
	    ok;
	Other4a ->
 	    ?line io:format("Unexpected: ~p", [Other4a]),
 	    ?line ?t:fail()
    end,
    receive
	{error_report,_,{Pid4,crash_report,[List4|_]}} ->
	    {exit,crashed,_} = proplists:get_value(error_info, List4),
	    Pid4 = proplists:get_value(pid, List4);
	Other4 ->
	    ?line io:format("Unexpected: ~p", [Other4]),
	    ?line ?t:fail()
    end,

    receive
	Any ->
	    ?line io:format("Unexpected: ~p", [Any]),
	    ?line ?t:fail()
    after 500 ->
	    ok
    end,

    ok.

%% --------------------------------------
%% Test gen_server:call and handle_call.
%% Test all different return values from
%% handle_call.
%% --------------------------------------

call(suite) -> [];
call(Config) when is_list(Config) ->
    OldFl = process_flag(trap_exit, true),

    ?line {ok, _Pid} =
	gen_server:start_link({local, my_test_name},
			      gen_server_SUITE, [], []),

    ?line ok = gen_server:call(my_test_name, started_p),
    ?line delayed = gen_server:call(my_test_name, {delayed_answer,1}),

    %% two requests within a specified time.
    ?line ok = gen_server:call(my_test_name, {call_within, 1000}),
    test_server:sleep(500),
    ?line ok = gen_server:call(my_test_name, next_call),
    ?line ok = gen_server:call(my_test_name, {call_within, 1000}),
    test_server:sleep(1500),
    ?line false = gen_server:call(my_test_name, next_call),
    
    %% timeout call.
    ?line delayed = gen_server:call(my_test_name, {delayed_answer,1}, 30),
    ?line {'EXIT',{timeout,_}} =
	(catch gen_server:call(my_test_name, {delayed_answer,30}, 1)),

    %% bad return value in the gen_server loop from handle_call.
    ?line {'EXIT',{{bad_return_value, badreturn},_}} =
	(catch gen_server:call(my_test_name, badreturn)),

    process_flag(trap_exit, OldFl),
    ok.

%% --------------------------------------
%% Test call to nonexisting processes on remote nodes
%% --------------------------------------

start_node(Name) ->
    ?line Pa = filename:dirname(code:which(?MODULE)),
    ?line N = test_server:start_node(Name, slave, [{args, " -pa " ++ Pa}]),
    %% After starting a slave, it takes a little while until global knows
    %% about it, even if nodes() includes it, so we make sure that global
    %% knows about it before registering something on all nodes.
    global:sync(),
    N.

call_remote1(suite) -> [];
call_remote1(Config) when is_list(Config) ->
    ?line N = hubba,
    ?line {ok, Node} = start_node(N),
    ?line {ok, Pid} = rpc:call(Node, gen_server, start,
			       [{global, N}, ?MODULE, [], []]),    
    ?line ok = (catch gen_server:call({global, N}, started_p, infinity)),
    ?line exit(Pid, boom),
    ?line {'EXIT', {Reason, _}} = (catch gen_server:call({global, N},
							 started_p, infinity)),
    ?line true = (Reason == noproc) orelse (Reason == boom),
    ok.

call_remote2(suite) -> [];
call_remote2(Config) when is_list(Config) ->
    ?line N = hubba,
    ?line {ok, Node} = start_node(N),

    ?line {ok, Pid} = rpc:call(Node, gen_server, start,
			       [{global, N}, ?MODULE, [], []]),
    ?line ok = (catch gen_server:call(Pid, started_p, infinity)),
    ?line exit(Pid, boom),
    ?line {'EXIT', {Reason, _}} = (catch gen_server:call(Pid,
							 started_p, infinity)),
    ?line true = (Reason == noproc) orelse (Reason == boom),
    ok.

call_remote3(suite) -> [];
call_remote3(Config) when is_list(Config) ->
    ?line N = hubba,
    ?line {ok, Node} = start_node(N),

    ?line {ok, Pid} = rpc:call(Node, gen_server, start,
			       [{local, piller}, ?MODULE, [], []]),
    ?line ok = (catch gen_server:call({piller, Node}, started_p, infinity)),
    ?line exit(Pid, boom),
    ?line {'EXIT', {Reason, _}} = (catch gen_server:call({piller, Node},
							 started_p, infinity)),
    ?line true = (Reason == noproc) orelse (Reason == boom),
    ok.

%% --------------------------------------
%% Test call to nonexisting node
%% --------------------------------------

call_remote_n1(suite) -> [];
call_remote_n1(Config) when is_list(Config) ->
    ?line N = hubba,
    ?line {ok, Node} = start_node(N),
    ?line {ok, _Pid} = rpc:call(Node, gen_server, start,
			       [{global, N}, ?MODULE, [], []]),
    ?line _ = test_server:stop_node(Node),
    ?line {'EXIT', {noproc, _}} =
	(catch gen_server:call({global, N}, started_p, infinity)),

    ok.

call_remote_n2(suite) -> [];
call_remote_n2(Config) when is_list(Config) ->
    ?line N = hubba,
    ?line {ok, Node} = start_node(N),

    ?line {ok, Pid} = rpc:call(Node, gen_server, start,
			       [{global, N}, ?MODULE, [], []]),
    ?line _ = test_server:stop_node(Node),
    ?line {'EXIT', {{nodedown, Node}, _}} = (catch gen_server:call(Pid,
							 started_p, infinity)),

    ok.

call_remote_n3(suite) -> [];
call_remote_n3(Config) when is_list(Config) ->
    ?line N = hubba,
    ?line {ok, Node} = start_node(N),

    ?line {ok, _Pid} = rpc:call(Node, gen_server, start,
			       [{local, piller}, ?MODULE, [], []]),
    ?line _ = test_server:stop_node(Node),
    ?line {'EXIT', {{nodedown, Node}, _}} = (catch gen_server:call({piller, Node},
							 started_p, infinity)),

    ok.

%% --------------------------------------
%% Test gen_server:cast and handle_cast.
%% Test all different return values from
%% handle_cast.
%% --------------------------------------

cast(suite) -> [];
cast(Config) when is_list(Config) ->
    ?line {ok, Pid} =
	gen_server:start({local, my_test_name},
			 gen_server_SUITE, [], []),

    ?line ok = gen_server:call(my_test_name, started_p),

    ?line ok = gen_server:cast(my_test_name, {self(),handle_cast}),
    ?line receive
	      {Pid, handled_cast} ->
		  ok
	  after 1000 ->
		  test_server:fail(handle_cast)
	  end,
    
    ?line ok = gen_server:cast(my_test_name, {self(),delayed_cast,1}),
    ?line receive
	      {Pid, delayed} ->
		  ok
	  after 1000 ->
		  test_server:fail(delayed_cast)
	  end,
    
    ?line ok = gen_server:cast(my_test_name, {self(),stop}),
    ?line receive
	      {Pid, stopped} ->
		  ok
	  after 1000 ->
		  test_server:fail(stop)
	  end,
    ok.

cast_fast(suite) -> [];
cast_fast(doc) -> ["Test that cast really return immediately"];
cast_fast(Config) when is_list(Config) ->
    ?line {ok,Node} = start_node(hubba),
    ?line {_,"@"++Host} = lists:splitwith(fun ($@) -> false; (_) -> true end,
					   atom_to_list(Node)),
    ?line FalseNode = list_to_atom("hopp@"++Host),
    ?line true = rpc:cast(Node, ?MODULE, cast_fast_messup, []),
%    ?line io:format("Nodes ~p~n", [rpc:call(N, ?MODULE, cast_fast_messup, [])]),
    ?line test_server:sleep(1000),
    ?line [Node] = nodes(),
    ?line {Time,ok} = test_server:timecall(gen_server, cast, 
					   [{hopp,FalseNode},hopp]),
    ?line true = test_server:stop_node(Node),
    ?line if Time > 1.0 -> % Default listen timeout is about 7.0 s
		  test_server:fail(hanging_cast);
	     true -> 
		  ok
	  end.

cast_fast_messup() ->
    %% Register a false node: hopp@hostname
    unregister(erl_epmd),
    erl_epmd:start_link(),
    {ok,S} = gen_tcp:listen(0, []),
    {ok,P} = inet:port(S),
    {ok,_Creation} = erl_epmd:register_node(hopp, P),
    receive after infinity -> ok end.

%% --------------------------------------
%% Test handle_info.
%% --------------------------------------

info(suite) -> [];
info(Config) when is_list(Config) ->
    ?line {ok, Pid} =
	gen_server:start({local, my_test_name},
			 gen_server_SUITE, [], []),

    ?line ok = gen_server:call(my_test_name, started_p),

    ?line Pid ! {self(),handle_info},
    ?line receive
	      {Pid, handled_info} ->
		  ok
	  after 1000 ->
		  test_server:fail(handle_info)
	  end,
    
    ?line Pid ! {self(),delayed_info,1},
    ?line receive
	      {Pid, delayed_info} ->
		  ok
	  after 1000 ->
		  test_server:fail(delayed_info)
	  end,
    
    ?line Pid ! {self(),stop},
    ?line receive
	      {Pid, stopped_info} ->
		  ok
	  after 1000 ->
		  test_server:fail(stop_info)
	  end,
    ok.

hibernate(suite) -> [];
hibernate(Config) when is_list(Config) ->
    OldFl = process_flag(trap_exit, true),
    ?line {ok, Pid0} =
	gen_server:start_link({local, my_test_name_hibernate0},
			 gen_server_SUITE, hibernate, []),
    ?line receive after 1000 -> ok end,
    ?line {current_function,{erlang,hibernate,3}} = erlang:process_info(Pid0,current_function),
    ?line ok = gen_server:call(my_test_name_hibernate0, stop),
    receive 
	{'EXIT', Pid0, stopped} ->
 	    ok
    after 5000 ->
	    test_server:fail(gen_server_did_not_die)
    end,

    ?line {ok, Pid} =
	gen_server:start_link({local, my_test_name_hibernate},
			 gen_server_SUITE, [], []),

    ?line ok = gen_server:call(my_test_name_hibernate, started_p),
    ?line true = gen_server:call(my_test_name_hibernate, hibernate),
    ?line receive after 1000 -> ok end,
    ?line {current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function),
    ?line Parent = self(),
    Fun = fun() ->
 		  receive
 		      go ->
 			  ok
 		  end,
 		  receive 
 		  after 1000 ->
 			  ok 
 		  end,
 		  X = erlang:process_info(Pid,current_function),
 		  Pid ! continue,
 		  Parent ! {result,X}
 	  end,
    ?line Pid2 = spawn_link(Fun),
    ?line true = gen_server:call(my_test_name_hibernate, {hibernate_noreply,Pid2}),

    ?line gen_server:cast(my_test_name_hibernate, hibernate_later),
    ?line true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid,current_function)),
    ?line receive after 2000 -> ok end,
    ?line ({current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function)),
    ?line ok = gen_server:call(my_test_name_hibernate, started_p),
    ?line true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid,current_function)),
    ?line gen_server:cast(my_test_name_hibernate, hibernate_now),
    ?line receive after 1000 -> ok end,
    ?line ({current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function)),
    ?line ok = gen_server:call(my_test_name_hibernate, started_p),
    ?line true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid,current_function)),
    ?line Pid ! hibernate_later,
    ?line true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid,current_function)),
    ?line receive after 2000 -> ok end,
    ?line ({current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function)),
    ?line ok = gen_server:call(my_test_name_hibernate, started_p),
    ?line true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid,current_function)),
    ?line Pid ! hibernate_now,
    ?line receive after 1000 -> ok end,
    ?line ({current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function)),
    ?line ok = gen_server:call(my_test_name_hibernate, started_p),
    ?line true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid,current_function)),
    ?line receive
 	      {result,R} ->
 		  ?line  {current_function,{erlang,hibernate,3}} = R
 	  end,
    ?line true = gen_server:call(my_test_name_hibernate, hibernate),
    ?line receive after 1000 -> ok end,
    ?line {current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function),
    ?line sys:suspend(my_test_name_hibernate),
    ?line receive after 1000 -> ok end,
    ?line {current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function),
    ?line sys:resume(my_test_name_hibernate),
    ?line receive after 1000 -> ok end,
    ?line {current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function),
    ?line ok = gen_server:call(my_test_name_hibernate, started_p),
    ?line true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid,current_function)),
    
    ?line ok = gen_server:call(my_test_name_hibernate, stop),
    receive 
	{'EXIT', Pid, stopped} ->
 	    ok
    after 5000 ->
	    test_server:fail(gen_server_did_not_die)
    end,
    process_flag(trap_exit, OldFl),
    ok.

%% --------------------------------------
%% Test gen_server:abcast and handle_cast.
%% Test all different return values from
%% handle_cast.
%% --------------------------------------

abcast(suite) -> [];
abcast(Config) when is_list(Config) ->
    ?line {ok, Pid} =
	gen_server:start({local, my_test_name},
			 gen_server_SUITE, [], []),

    ?line ok = gen_server:call(my_test_name, started_p),

    ?line abcast = gen_server:abcast(my_test_name, {self(),handle_cast}),
    ?line receive
	      {Pid, handled_cast} ->
		  ok
	  after 1000 ->
		  test_server:fail(abcast)
	  end,
    
    ?line abcast = gen_server:abcast([node()], my_test_name,
				     {self(),delayed_cast,1}),
    ?line receive
	      {Pid, delayed} ->
		  ok
	  after 1000 ->
		  test_server:fail(delayed_abcast)
	  end,
    
    ?line abcast = gen_server:abcast(my_test_name, {self(),stop}),
    ?line receive
	      {Pid, stopped} ->
		  ok
	  after 1000 ->
		  test_server:fail(abcast_stop)
	  end,
    ok.

%% --------------------------------------
%% Test gen_server:multicall and handle_call.
%% Test all different return values from
%% handle_call.
%% --------------------------------------

multicall(suite) -> [];
multicall(Config) when is_list(Config) ->
    OldFl = process_flag(trap_exit, true),

    ?line {ok, Pid} =
	gen_server:start_link({local, my_test_name},
			      gen_server_SUITE, [], []),

    ?line ok = gen_server:call(my_test_name, started_p),
    Nodes = nodes(),
    Node = node(),
    ?line {[{Node,delayed}],Nodes} =
	   gen_server:multi_call(my_test_name, {delayed_answer,1}),

    %% two requests within a specified time.
    ?line {[{Node,ok}],[]} =
	   gen_server:multi_call([Node], my_test_name, {call_within, 1000}),
    test_server:sleep(500),
    ?line {[{Node,ok}],[]} =
	   gen_server:multi_call([Node], my_test_name, next_call),
    ?line  {[{Node,ok}],[]} =
	    gen_server:multi_call([Node], my_test_name, {call_within, 1000}),
    test_server:sleep(1500),
    ?line {[{Node,false}],[]} =
	   gen_server:multi_call([Node],my_test_name, next_call),

    %% Stop the server.
    ?line {[{Node,ok}],[]} =
	   gen_server:multi_call([Node],my_test_name, stop),
    receive
	{'EXIT', Pid, stopped} -> ok
    after 1000 ->
	    test_server:fail(multicall_stop)
    end,
    
    process_flag(trap_exit, OldFl),

    ok.

%% OTP-3587
multicall_down(suite) -> [];
multicall_down(Config) when is_list(Config) ->
    %% We need a named host which is inaccessible.
    ?line Name = node@test01,

    %% We use 'global' as a gen_server to call.
    ?line {Good, Bad} = gen_server:multi_call([Name, node()],
					      global_name_server,
					      {whereis, gurkburk},
					      3000),
    io:format("good = ~p, bad = ~p~n", [Good, Bad]),
    ?line [Name] = Bad,
    ok.

busy_wait_for_process(Pid,N) ->
    case erlang:is_process_alive(Pid) of
	true ->
	    receive
	    after 100 ->
		    ok
	    end,
	    busy_wait_for_process(Pid,N-1);
	_ ->
	    ok
    end.
%%--------------------------------------------------------------
spec_init(doc) ->
    ["Test gen_server:enter_loop/[3,4,5]. Used when you want to write " 
     "your own special init-phase."];
spec_init(suite) ->
    [];
spec_init(Config) when is_list(Config) ->
    
    OldFlag = process_flag(trap_exit, true),
    
    ?line {ok, Pid0} = start_link(spec_init_local, [{ok, my_server}, []]),
    ?line ok = gen_server:call(Pid0, started_p),
    ?line ok = gen_server:call(Pid0, stop),
    receive 
	{'EXIT', Pid0, stopped} ->
 	    ok
    after 5000 ->
	    test_server:fail(gen_server_did_not_die)
    end,
    
    ?line {ok, Pid01} = start_link(spec_init_local, [{not_ok, my_server}, []]),
    receive 
 	{'EXIT', Pid01, process_not_registered} ->
 	    ok
    after 5000 ->
	    test_server:fail(gen_server_did_not_die)
    end,
    
    ?line {ok, Pid1} = start_link(spec_init_global, [{ok, my_server}, []]),
    ?line ok = gen_server:call(Pid1, started_p),
    ?line ok = gen_server:call(Pid1, stop),
    receive 
	{'EXIT', Pid1, stopped} ->
 	    ok
    after 5000 ->
	    test_server:fail(gen_server_did_not_die)
    end,
    
    ?line {ok, Pid11} = 
	start_link(spec_init_global, [{not_ok, my_server}, []]),

    receive 
	{'EXIT', Pid11, process_not_registered_globally} ->
 	    ok
    after 5000 ->
	    test_server:fail(gen_server_did_not_die)
    end,
    
    ?line {ok, Pid2} = start_link(spec_init_anonymous, [[]]),
    ?line ok = gen_server:call(Pid2, started_p),
    ?line ok = gen_server:call(Pid2, stop),
    receive 
	{'EXIT', Pid2, stopped} ->
 	    ok
    after 5000 ->
	    test_server:fail(gen_server_did_not_die)
    end,
    
    ?line {ok, Pid3} = start_link(spec_init_anonymous_default_timeout, [[]]),
    ?line ok = gen_server:call(Pid3, started_p),
    ?line ok = gen_server:call(Pid3, stop),
    receive 
	{'EXIT', Pid3, stopped} ->
 	    ok
    after 5000 ->
	    test_server:fail(gen_server_did_not_die)
    end,
    
    ?line {ok, Pid4} = 
	start_link(spec_init_default_timeout, [{ok, my_server}, []]),
    ?line ok = gen_server:call(Pid4, started_p),
    ?line ok = gen_server:call(Pid4, stop),
    receive 
	{'EXIT', Pid4, stopped} ->
 	    ok
    after 5000 ->
	    test_server:fail(gen_server_did_not_die)
    end,

    ?line Pid5 = 
	erlang:spawn_link(?MODULE, spec_init_not_proc_lib, [[]]),
    receive 
	{'EXIT', Pid5, process_was_not_started_by_proc_lib} ->
 	    ok
    after 5000 ->
	    test_server:fail(gen_server_did_not_die)
    end,
    process_flag(trap_exit, OldFlag),
    ok.

%%--------------------------------------------------------------
spec_init_local_registered_parent(doc) ->
    ["Test that terminate is run when the parent is a locally registered "
     "process OTP-4820"];
spec_init_local_registered_parent(suite) -> [];
spec_init_local_registered_parent(Config) when is_list(Config) ->

    register(foobar, self()),
    process_flag(trap_exit, true),
    
    ?line {ok, Pid} = start_link(spec_init_local, [{ok, my_server}, []]),
    
    ?line ok = gen_server:cast(my_server, {self(),stop}),
    ?line receive
	      {Pid, stopped} ->
		  ok
	  after 1000 ->
		  test_server:fail(stop)
	  end,
    unregister(foobar),
    ok.
%%--------------------------------------------------------------
spec_init_global_registered_parent(doc) ->
    ["Test that terminate is run when the parent is a global registered "
     "process OTP-4820"];
spec_init_global_registered_parent(suite) -> [];
spec_init_global_registered_parent(Config) when is_list(Config) ->

    global:register_name(foobar, self()),
    process_flag(trap_exit, true),
    
    ?line {ok, Pid} = start_link(spec_init_global, [{ok, my_server}, []]),
    
    ?line ok = gen_server:call(Pid, started_p),
    ?line ok = gen_server:cast(Pid, {self(),stop}),  

    ?line receive
	      {Pid, stopped} ->
		  ok
	  after 1000 ->
		  test_server:fail(stop)
	  end,
    global:unregister_name(foobar),
    ok.
%%--------------------------------------------------------------
otp_5854(suite) ->
    [];
otp_5854(doc) ->
    ["Test check for registered name in enter_loop/3,4,5"];
otp_5854(Config) when is_list(Config) ->
    OldFlag = process_flag(trap_exit, true),

    %% Make sure gen_server:enter_loop does not accept {local,Name}
    %% when it's another process than the calling one which is
    %% registered under that name
    register(armitage, self()),
    ?line {ok, Pid1} =
	start_link(spec_init_local, [{not_ok, armitage}, []]),
    receive
	{'EXIT', Pid1, process_not_registered} ->
	    ok
    after 1000 ->
	    ?line test_server:fail(gen_server_started)
    end,
    unregister(armitage),

    %% Make sure gen_server:enter_loop does not accept {global,Name}
    %% when it's another process than the calling one which is
    %% registered under that name
    global:register_name(armitage, self()),
    ?line {ok, Pid2} =
	start_link(spec_init_global, [{not_ok, armitage}, []]),
    receive
	{'EXIT', Pid2, process_not_registered_globally} ->
	    ok
    after 1000 ->
	    ?line test_server:fail(gen_server_started)
    end,
    global:unregister_name(armitage),

    process_flag(trap_exit, OldFlag),
    ok.

%% If initialization fails (with ignore or {stop,Reason}),
%% make sure that the process is not registered when gen_server:start()
%% returns.

otp_7669(Config) when is_list(Config) ->
    ?line ?t:do_times(100, fun do_otp_7669_local_ignore/0),
    ?line ?t:do_times(100, fun do_otp_7669_global_ignore/0),
    ?line ?t:do_times(10, fun do_otp_7669_stop/0),
    ok.    

do_otp_7669_local_ignore() ->
    %% The name should never be registered after the return
    %% from gen_server:start/3.
    ?line ignore = gen_server:start({local,?MODULE}, ?MODULE, ignore, []),
    ?line undefined = whereis(?MODULE),
    ?line ignore = gen_server:start({local,?MODULE}, ?MODULE, ignore, []),
    ?line undefined = whereis(?MODULE),
    ?line ignore = gen_server:start_link({local,?MODULE}, ?MODULE, ignore, []),
    ?line undefined = whereis(?MODULE).

do_otp_7669_global_ignore() ->
    ?line ignore = gen_server:start({global,?MODULE}, ?MODULE, ignore, []),
    ?line undefined = global:whereis_name(?MODULE),
    ?line ignore = gen_server:start_link({global,?MODULE}, ?MODULE, ignore, []),
    ?line undefined = global:whereis_name(?MODULE).

do_otp_7669_stop() ->
    %% The name should never be registered after the return
    %% from gen_server:start/3.
    ?line {error,stopped} = gen_server:start({local,?MODULE},
					     ?MODULE, stop, []),
    ?line undefined = whereis(?MODULE),

    ?line {error,stopped} = gen_server:start({global,?MODULE},
					     ?MODULE, stop, []),
    ?line undefined = global:whereis_name(?MODULE).

%% Verify that sys:get_status correctly calls our format_status/2 fun
%%
call_format_status(suite) ->
    [];
call_format_status(doc) ->
    ["Test that sys:get_status/1,2 calls format_status/2"];
call_format_status(Config) when is_list(Config) ->
    ?line {ok, Pid} = gen_server:start_link({local, call_format_status},
					    ?MODULE, [], []),
    ?line Status1 = sys:get_status(call_format_status),
    ?line {status, Pid, _Mod, [_PDict, running, _Parent, _, Data1]} = Status1,
    ?line [format_status_called | _] = lists:reverse(Data1),
    ?line Status2 = sys:get_status(call_format_status, 5000),
    ?line {status, Pid, _Mod, [_PDict, running, _Parent, _, Data2]} = Status2,
    ?line [format_status_called | _] = lists:reverse(Data2),

    %% check that format_status can handle a name being a pid (atom is
    %% already checked by the previous test)
    ?line {ok, Pid3} = gen_server:start_link(gen_server_SUITE, [], []),
    ?line Status3 = sys:get_status(Pid3),
    ?line {status, Pid3, _Mod, [_PDict3, running, _Parent, _, Data3]} = Status3,
    ?line [format_status_called | _] = lists:reverse(Data3),

    %% check that format_status can handle a name being a term other than a
    %% pid or atom
    GlobalName1 = {global, "CallFormatStatus"},
    ?line {ok, Pid4} = gen_server:start_link(GlobalName1,
					     gen_server_SUITE, [], []),
    ?line Status4 = sys:get_status(Pid4),
    ?line {status, Pid4, _Mod, [_PDict4, running, _Parent, _, Data4]} = Status4,
    ?line [format_status_called | _] = lists:reverse(Data4),
    GlobalName2 = {global, {name, "term"}},
    ?line {ok, Pid5} = gen_server:start_link(GlobalName2,
					     gen_server_SUITE, [], []),
    ?line Status5 = sys:get_status(GlobalName2),
    ?line {status, Pid5, _Mod, [_PDict5, running, _Parent, _, Data5]} = Status5,
    ?line [format_status_called | _] = lists:reverse(Data5),
    ok.

%% Verify that error termination correctly calls our format_status/2 fun
%%
error_format_status(suite) ->
    [];
error_format_status(doc) ->
    ["Test that an error termination calls format_status/2"];
error_format_status(Config) when is_list(Config) ->
    ?line error_logger_forwarder:register(),
    OldFl = process_flag(trap_exit, true),
    State = "called format_status",
    ?line {ok, Pid} = gen_server:start_link(?MODULE, {state, State}, []),
    ?line {'EXIT',{crashed,_}} = (catch gen_server:call(Pid, crash)),
    receive
	{'EXIT', Pid, crashed} ->
	    ok
    end,
    receive
	{error,_GroupLeader,{Pid,
			     "** Generic server"++_,
			     [Pid,crash,State,crashed]}} ->
	    ok;
	Other ->
	    ?line io:format("Unexpected: ~p", [Other]),
	    ?line ?t:fail()
    end,
    ?t:messages_get(),
    process_flag(trap_exit, OldFl),
    ok.

%% Test that the time for a huge message queue is not
%% significantly slower than with an empty message queue.
call_with_huge_message_queue(Config) when is_list(Config) ->
    ?line Pid = spawn_link(fun echo_loop/0),

    ?line {Time,ok} = tc(fun() -> calls(10, Pid) end),

    ?line [self() ! {msg,N} || N <- lists:seq(1, 500000)],
    erlang:garbage_collect(),
    ?line {NewTime,ok} = tc(fun() -> calls(10, Pid) end),
    io:format("Time for empty message queue: ~p", [Time]),
    io:format("Time for huge message queue: ~p", [NewTime]),

    case (NewTime+1) / (Time+1) of
	Q when Q < 10 ->
	    ok;
	Q ->
	    io:format("Q = ~p", [Q]),
	    ?line ?t:fail()
    end,
    ok.

calls(0, _) -> ok;
calls(N, Pid) ->
    {ultimate_answer,42} = call(Pid, {ultimate_answer,42}),
    calls(N-1, Pid).

call(Pid, Msg) ->
    gen_server:call(Pid, Msg, infinity).

tc(Fun) ->
    timer:tc(erlang, apply, [Fun,[]]).

echo_loop() ->
    receive
	{'$gen_call',{Pid,Ref},Msg} ->
	    Pid ! {Ref,Msg},
	    echo_loop()
    end.

%%--------------------------------------------------------------
%% Help functions to spec_init_*
start_link(Init, Options) ->
    proc_lib:start_link(?MODULE, Init, Options).

spec_init_local({ok, Name}, Options) ->
    process_flag(trap_exit, true),
    register(Name, self()),
    proc_lib:init_ack({ok, self()}),
    %% Supervised init can occur here  ...
    gen_server:enter_loop(?MODULE, Options, {}, {local, Name}, infinity);

spec_init_local({not_ok, Name}, Options) ->
    process_flag(trap_exit, true),
    proc_lib:init_ack({ok, self()}),
    %% Supervised init can occur here  ...
    gen_server:enter_loop(?MODULE, Options, {}, {local, Name}, infinity).

spec_init_global({ok, Name}, Options) ->
    process_flag(trap_exit, true),
    global:register_name(Name, self()),
    proc_lib:init_ack({ok, self()}),
    %% Supervised init can occur here  ...
    gen_server:enter_loop(?MODULE, Options, {}, {global, Name}, infinity);

spec_init_global({not_ok, Name}, Options) ->
    process_flag(trap_exit, true),
    proc_lib:init_ack({ok, self()}),
    %% Supervised init can occur here  ...
    gen_server:enter_loop(?MODULE, Options, {}, {global, Name}, infinity).

spec_init_default_timeout({ok, Name}, Options) -> 
    process_flag(trap_exit, true),
    register(Name, self()),
    proc_lib:init_ack({ok, self()}),
    %% Supervised init can occur here  ...
    gen_server:enter_loop(?MODULE, Options, {}, {local, Name}).

spec_init_anonymous(Options) ->
    process_flag(trap_exit, true),
    proc_lib:init_ack({ok, self()}),
    %% Supervised init can occur here  ...
    gen_server:enter_loop(?MODULE, Options, {}, infinity).

spec_init_anonymous_default_timeout(Options) ->
    process_flag(trap_exit, true),
    proc_lib:init_ack({ok, self()}),
    %% Supervised init can occur here  ...
    gen_server:enter_loop(?MODULE, Options, {}).

spec_init_not_proc_lib(Options) ->
    gen_server:enter_loop(?MODULE, Options, {}, infinity).

%%% --------------------------------------------------------
%%% Here is the tested gen_server behaviour.
%%% --------------------------------------------------------

init([]) ->
    {ok, []};
init(ignore) ->
    ignore;
init(stop) ->
    {stop, stopped};
init(hibernate) ->
    {ok,[],hibernate};
init(sleep) ->
    test_server:sleep(1000),
    {ok, []};
init({state,State}) ->
    {ok, State}.

handle_call(started_p, _From, State) ->
    io:format("FROZ"),
    {reply,ok,State};
handle_call({delayed_answer, T}, From, _State) ->
    {noreply,{reply_to,From},T};
handle_call({call_within, T}, _From, _) ->
    {reply,ok,call_within,T};
handle_call(next_call, _From, call_within) ->
    {reply,ok,[]};
handle_call(next_call, _From, State) ->
    {reply,false,State};
handle_call(badreturn, _From, _State) ->
    badreturn;
handle_call(hibernate, _From, _State) ->
    {reply,true,[],hibernate};
handle_call({hibernate_noreply,Pid}, From, _State) ->
    Pid ! go,
    {noreply,From,hibernate};
handle_call(stop, _From, State) ->
    {stop,stopped,ok,State};
handle_call(crash, _From, _State) ->
    exit(crashed);
handle_call(exit_shutdown, _From, _State) ->
    exit(shutdown);
handle_call(stop_shutdown, _From, State) ->
    {stop,shutdown,State};
handle_call(shutdown_reason, _From, _State) ->
    exit({shutdown,reason});
handle_call(stop_shutdown_reason, _From, State) ->
    {stop,{shutdown,stop_reason},State}.

handle_cast({From,handle_cast}, State) ->
    From ! {self(), handled_cast},
    {noreply, State};
handle_cast({From,delayed_cast,T}, _State) ->
    {noreply, {delayed_cast,From}, T};
handle_cast(hibernate_now, _State) ->
    {noreply, [], hibernate};
handle_cast(hibernate_later, _State) ->
    timer:send_after(1000,self(),hibernate_now),
    {noreply, []};
handle_cast({From, stop}, State) ->
    io:format("BAZ"),
    {stop, {From,stopped}, State}.

handle_info(timeout, {reply_to, From}) ->
    gen_server:reply(From, delayed),
    {noreply, []};
handle_info(timeout, hibernate_me) -> % Arrive here from 
				      % handle_info(hibernate_later,...)
    {noreply, [], hibernate};
handle_info(hibernate_now, _State) ->  % Arrive here from 
				       % handle_cast({_,hibernate_later},...)
				       % and by direct ! from testcase
    {noreply, [], hibernate};
handle_info(hibernate_later, _State) ->
    {noreply, hibernate_me, 1000};
handle_info(timeout, call_within) ->
    {noreply, []};
handle_info(timeout, {delayed_cast, From}) ->
    From ! {self(), delayed},
    {noreply, []};
handle_info(timeout, {delayed_info, From}) ->
    From ! {self(), delayed_info},
    {noreply, []};
handle_info({From, handle_info}, _State) ->
    From ! {self(), handled_info},
    {noreply, []};
handle_info({From, delayed_info, T}, _State) ->
    {noreply, {delayed_info, From}, T};
handle_info(continue, From) ->
    gen_server:reply(From,true),
    {noreply, []};
handle_info({From, stop}, State) ->
    {stop, {From,stopped_info}, State};
handle_info(_Info, State) ->
    {noreply, State}.

terminate({From, stopped}, _State) ->
    io:format("FOOBAR"),
    From ! {self(), stopped},
    ok;
terminate({From, stopped_info}, _State) ->
    From ! {self(), stopped_info},
    ok;
terminate(_Reason, _State) ->
    ok.

format_status(terminate, [_PDict, State]) ->
    State;
format_status(normal, [_PDict, _State]) ->
    format_status_called.