aboutsummaryrefslogtreecommitdiffstats
path: root/erts/emulator/test/node_container_SUITE.erl
blob: 3bf1e207de25edb136aa19bce7c2ecc341b1b670 (plain) (blame)
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
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
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
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
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 2002-2012. 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
%%
%% Unless required by applicable law or agreed to in writing, software
%% 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.
%% 
%% %CopyrightEnd%
%%

%%%----------------------------------------------------------------------
%%% File    : node_container_SUITE.erl
%%% Author  : Rickard <[email protected]>
%%% Purpose : 
%%% Created : 24 Jul 2002 by Rickard <[email protected]>
%%%----------------------------------------------------------------------

-module(node_container_SUITE).
-author('[email protected]').

%-define(line_trace, 1).

-include_lib("common_test/include/ct.hrl").

-export([all/0, suite/0, init_per_suite/1, end_per_suite/1,
	 init_per_testcase/2, end_per_testcase/2,
	 node_container_refc_check/1]).

-export([term_to_binary_to_term_eq/1,
	 round_trip_eq/1,
	 cmp/1,
	 ref_eq/1,
	 node_table_gc/1,
	 dist_link_refc/1,
	 dist_monitor_refc/1,
	 node_controller_refc/1,
	 ets_refc/1,
	 match_spec_refc/1,
	 timer_refc/1,
	 otp_4715/1,
	 pid_wrap/1,
	 port_wrap/1,
	 bad_nc/1,
	 unique_pid/1,
	 iter_max_procs/1]).

suite() ->
    [{ct_hooks,[ts_install_cth]},
     {timetrap, {minutes, 10}}].


all() -> 
    [term_to_binary_to_term_eq, round_trip_eq, cmp, ref_eq,
     node_table_gc, dist_link_refc, dist_monitor_refc,
     node_controller_refc, ets_refc, match_spec_refc,
     timer_refc, otp_4715, pid_wrap, port_wrap, bad_nc,
     unique_pid, iter_max_procs].

init_per_suite(Config) ->
    Config.

end_per_suite(_Config) ->
    erts_debug:set_internal_state(available_internal_state, true),
    erts_debug:set_internal_state(node_tab_delayed_delete, -1), %% restore original value
    available_internal_state(false).

available_internal_state(Bool) when Bool == true; Bool == false ->
    case {Bool,
	  (catch erts_debug:get_internal_state(available_internal_state))} of
	{true, true} ->
	    true;
	{false, true} ->
	    erts_debug:set_internal_state(available_internal_state, false),
	    true;
	{true, _} ->
	    erts_debug:set_internal_state(available_internal_state, true),
	    false;
	{false, _} ->
	    false
    end.

init_per_testcase(_Case, Config) when is_list(Config) ->
    available_internal_state(true),
    Config.

end_per_testcase(_Case, Config) when is_list(Config) ->
    ok.

%%%
%%% The test cases -------------------------------------------------------------
%%%

-define(MAX_PIDS_PORTS, ((1 bsl 28) - 1)).

%%
%% Test case: term_to_binary_to_term_eq
%%
term_to_binary_to_term_eq(doc) ->
    ["Tests that node container terms that are converted to external format "
     "and back stay equal to themselves."];
term_to_binary_to_term_eq(suite) -> [];
term_to_binary_to_term_eq(Config) when is_list(Config) ->
    ?line ThisNode = {node(), erlang:system_info(creation)},
    % Get local node containers
    ?line LPid = self(),
    ?line LXPid = mk_pid(ThisNode, 32767, 8191),
    ?line LPort = hd(erlang:ports()),
    ?line LXPort = mk_port(ThisNode, 268435455),
    ?line LLRef = make_ref(),
    ?line LHLRef = mk_ref(ThisNode, [47, 11]),
    ?line LSRef = mk_ref(ThisNode, [4711]),
    % Test local nc:s
    ?line LPid = binary_to_term(term_to_binary(LPid)),
    ?line LXPid = binary_to_term(term_to_binary(LXPid)),
    ?line LPort = binary_to_term(term_to_binary(LPort)),
    ?line LXPort = binary_to_term(term_to_binary(LXPort)),
    ?line LLRef = binary_to_term(term_to_binary(LLRef)),
    ?line LHLRef = binary_to_term(term_to_binary(LHLRef)),
    ?line LSRef = binary_to_term(term_to_binary(LSRef)),
    % Get remote node containers
    ?line RNode = {get_nodename(), 3},
    ?line RPid = mk_pid(RNode, 4711, 1),
    ?line RXPid = mk_pid(RNode, 32767, 8191),
    ?line RPort = mk_port(RNode, 4711),
    ?line RXPort = mk_port(RNode, 268435455),
    ?line RLRef = mk_ref(RNode, [4711, 4711, 4711]),
    ?line RHLRef = mk_ref(RNode, [4711, 4711]),
    ?line RSRef = mk_ref(RNode, [4711]),
    % Test remote nc:s
    ?line RPid = binary_to_term(term_to_binary(RPid)),
    ?line RXPid = binary_to_term(term_to_binary(RXPid)),
    ?line RPort = binary_to_term(term_to_binary(RPort)),
    ?line RXPort = binary_to_term(term_to_binary(RXPort)),
    ?line RLRef = binary_to_term(term_to_binary(RLRef)),
    ?line RHLRef = binary_to_term(term_to_binary(RHLRef)),
    ?line RSRef = binary_to_term(term_to_binary(RSRef)),
    ?line nc_refc_check(node()),
    ?line ok.


%%
%% Test case: round_trip_eq
%%
round_trip_eq(doc) ->
    ["Tests that node containers that are sent beteen nodes stay equal to "
     "themselves."];
round_trip_eq(suite) -> [];
round_trip_eq(Config) when is_list(Config) ->
    ?line ThisNode = {node(), erlang:system_info(creation)},
    ?line NodeFirstName = get_nodefirstname(),
    ?line ?line {ok, Node} = start_node(NodeFirstName),
    ?line Self = self(),
    ?line RPid = spawn_link(Node,
			    fun () ->
				    receive
					{Self, Data} ->
					    Self ! {self(), Data}
				    end
			    end),
    ?line SentPid = self(),
    ?line SentXPid = mk_pid(ThisNode, 17471, 8190),
    ?line SentPort = hd(erlang:ports()),
    ?line SentXPort = mk_port(ThisNode, 268435451),
    ?line SentLRef = make_ref(),
    ?line SentHLRef = mk_ref(ThisNode, [4711, 17]),
    ?line SentSRef = mk_ref(ThisNode, [4711]),
    ?line RPid ! {Self, {SentPid,
			 SentXPid,
			 SentPort,
			 SentXPort,
			 SentLRef,
			 SentHLRef,
			 SentSRef}},
    receive
	{RPid, {RecPid,
		RecXPid,
		RecPort,
		RecXPort,
		RecLRef,
		RecHLRef,
		RecSRef}} ->
	    ?line stop_node(Node),
	    ?line SentPid = RecPid,
	    ?line SentXPid = RecXPid,
	    ?line SentPort = RecPort,
	    ?line SentXPort = RecXPort,
	    ?line SentLRef = RecLRef,
	    ?line SentHLRef = RecHLRef,
	    ?line SentSRef = RecSRef,
	    ?line nc_refc_check(node()),
	    ?line ok
    end.
	    


%%
%% Test case: cmp
%%
cmp(doc) ->
    ["Tests that Erlang term comparison works as it should on node "
     "containers."];
cmp(suite) -> [];
cmp(Config) when is_list(Config) ->

    %% Inter type comparison ---------------------------------------------------

    %% The Erlang term order:
    %% number < atom < ref < fun < port < pid < tuple < nil < cons < binary
    RNode = {get_nodename(), 2},

    IRef = make_ref(),
    ERef = mk_ref({get_nodename(), 2}, [1,2,3]),
    
    IPid = self(),
    EPid = mk_pid(RNode, 1, 2),

    IPort = hd(erlang:ports()),
    EPort = mk_port(RNode, 1),
    
    %% Test pids ----------------------------------------------------
    ?line true = 1 < IPid,
    ?line true = 1.3 < IPid,
    ?line true = (1 bsl 64) < IPid,
    ?line true = an_atom < IPid,
    ?line true = IRef < IPid,
    ?line true = ERef < IPid,
    ?line true = fun () -> a_fun end < IPid,
    ?line true = IPort < IPid,
    ?line true = EPort < IPid,
    ?line true = IPid < {a, tuple},
    ?line true = IPid < [],
    ?line true = IPid < [a|cons],
    ?line true = IPid < <<"a binary">>,

    ?line true = 1 < EPid,
    ?line true = 1.3 < EPid,
    ?line true = (1 bsl 64) < EPid,
    ?line true = an_atom < EPid,
    ?line true = IRef < EPid,
    ?line true = ERef < EPid,
    ?line true = fun () -> a_fun end < EPid,
    ?line true = IPort < EPid,
    ?line true = EPort < EPid,
    ?line true = EPid < {a, tuple},
    ?line true = EPid < [],
    ?line true = EPid < [a|cons],
    ?line true = EPid < <<"a binary">>,

    %% Test ports --------------------------------------------------
    ?line true = 1 < IPort,
    ?line true = 1.3 < IPort,
    ?line true = (1 bsl 64) < IPort,
    ?line true = an_atom < IPort,
    ?line true = IRef < IPort,
    ?line true = ERef < IPort,
    ?line true = fun () -> a_fun end < IPort,
    ?line true = IPort < IPid,
    ?line true = IPort < EPid,
    ?line true = IPort < {a, tuple},
    ?line true = IPort < [],
    ?line true = IPort < [a|cons],
    ?line true = IPort < <<"a binary">>,

    ?line true = 1 < EPort,
    ?line true = 1.3 < EPort,
    ?line true = (1 bsl 64) < EPort,
    ?line true = an_atom < EPort,
    ?line true = IRef < EPort,
    ?line true = ERef < EPort,
    ?line true = fun () -> a_fun end < EPort,
    ?line true = EPort < IPid,
    ?line true = EPort < EPid,
    ?line true = EPort < {a, tuple},
    ?line true = EPort < [],
    ?line true = EPort < [a|cons],
    ?line true = EPort < <<"a binary">>,

    %% Test refs ----------------------------------------------------
    ?line true = 1 < IRef,
    ?line true = 1.3 < IRef,
    ?line true = (1 bsl 64) < IRef,
    ?line true = an_atom < IRef,
    ?line true = IRef < fun () -> a_fun end,
    ?line true = IRef < IPort,
    ?line true = IRef < EPort,
    ?line true = IRef < IPid,
    ?line true = IRef < EPid,
    ?line true = IRef < {a, tuple},
    ?line true = IRef < [],
    ?line true = IRef < [a|cons],
    ?line true = IRef < <<"a binary">>,

    ?line true = 1 < ERef,
    ?line true = 1.3 < ERef,
    ?line true = (1 bsl 64) < ERef,
    ?line true = an_atom < ERef,
    ?line true = ERef < fun () -> a_fun end,
    ?line true = ERef < IPort,
    ?line true = ERef < EPort,
    ?line true = ERef < IPid,
    ?line true = ERef < EPid,
    ?line true = ERef < {a, tuple},
    ?line true = ERef < [],
    ?line true = ERef < [a|cons],
    ?line true = ERef < <<"a binary">>,


    %% Intra type comparison ---------------------------------------------------
	

    %% Test pids ----------------------------------------------------
    %%
    %% Significance (most -> least):
    %%   serial, number, nodename, creation
    %%

    ?line Pid = mk_pid({b@b, 2}, 4711, 1),

    ?line true = mk_pid({a@b, 1}, 4710, 2) > Pid,
    ?line true = mk_pid({a@b, 1}, 4712, 1) > Pid,
    ?line true = mk_pid({c@b, 1}, 4711, 1) > Pid,
    ?line true = mk_pid({b@b, 3}, 4711, 1) > Pid,
    ?line true = mk_pid({b@b, 2}, 4711, 1) =:= Pid,

    %% Test ports ---------------------------------------------------
    %%
    %% Significance (most -> least):
    %%   nodename, creation, number 
    %%
    %% OBS: Comparison between ports has changed in R9. This
    %%      since it wasn't stable in R8 (and eariler releases).
    %%      Significance used to be: dist_slot, number,
    %%      creation.

    ?line Port = mk_port({b@b, 2}, 4711),

    ?line true = mk_port({c@b, 1}, 4710) > Port,
    ?line true = mk_port({b@b, 3}, 4710) > Port,
    ?line true = mk_port({b@b, 2}, 4712) > Port,
    ?line true = mk_port({b@b, 2}, 4711) =:= Port,

    %% Test refs ----------------------------------------------------
    %% Significance (most -> least):
    %% nodename, creation, (number high, number mid), number low, 
    %%
    %% OBS: Comparison between refs has changed in R9. This
    %%      since it wasn't stable in R8 (and eariler releases).
    %%      Significance used to be: dist_slot, number,
    %%      creation.
    %%

    ?line Ref = mk_ref({b@b, 2}, [4711, 4711, 4711]),

    ?line true = mk_ref({c@b, 1}, [4710, 4710, 4710]) > Ref,
    ?line true = mk_ref({b@b, 3}, [4710, 4710, 4710]) > Ref,
    ?line true = mk_ref({b@b, 2}, [4710, 4710, 4712]) > Ref,
    ?line true = mk_ref({b@b, 2}, [4710, 4712, 4711]) > Ref,
    ?line true = mk_ref({b@b, 2}, [4712, 4711, 4711]) > Ref,
    ?line true = mk_ref({b@b, 2}, [4711, 4711, 4711]) =:= Ref,

    ok.

%%
%% Test case: ref_eq
%%
ref_eq(doc) -> ["Test that one word refs \"works\"."];
ref_eq(suite) -> [];
ref_eq(Config) when is_list(Config) ->
    ?line ThisNode = {node(), erlang:system_info(creation)},
    ?line AnotherNode = {get_nodename(),2},
    ?line LLongRef = mk_ref(ThisNode, [4711, 0, 0]),
    ?line LHalfLongRef = mk_ref(ThisNode, [4711, 0]),
    ?line LShortRef = mk_ref(ThisNode, [4711]),
    ?line true = LLongRef =:= LShortRef,
    ?line true = LLongRef =:= LHalfLongRef,
    ?line true = LLongRef =:= LLongRef,
    ?line true = LHalfLongRef =:= LShortRef,
    ?line true = LHalfLongRef =:= LHalfLongRef,
    ?line true = LShortRef =:= LShortRef,
    ?line false = LShortRef == mk_ref(ThisNode, [4711, 0, 1]), % Not any more
    ?line RLongRef = mk_ref(AnotherNode, [4711, 0, 0]),
    ?line RHalfLongRef = mk_ref(AnotherNode, [4711, 0]),
    ?line RShortRef = mk_ref(AnotherNode, [4711]),
    ?line true = RLongRef =:= RShortRef,
    ?line true = RLongRef =:= RHalfLongRef,
    ?line true = RLongRef =:= RLongRef,
    ?line true = RHalfLongRef =:= RShortRef,
    ?line true = RHalfLongRef =:= RHalfLongRef,
    ?line true = RShortRef =:= RShortRef,
    ?line false = RShortRef == mk_ref(AnotherNode, [4711, 0, 1]), % Not any more
    ?line nc_refc_check(node()),
    ?line ok.
    
%%
%% Test case: node_table_gc
%%
node_table_gc(doc) ->
    ["Tests that node tables are garbage collected."];
node_table_gc(suite) -> [];
node_table_gc(Config) when is_list(Config) ->
    erts_debug:set_internal_state(available_internal_state, true),
    erts_debug:set_internal_state(node_tab_delayed_delete, 0),
    ?line PreKnown = nodes(known),
    ?line ?t:format("PreKnown = ~p~n", [PreKnown]),
    ?line make_node_garbage(0, 200000, 1000, []),
    ?line PostKnown = nodes(known),
    ?line PostAreas = erlang:system_info(allocated_areas),
    ?line ?t:format("PostKnown = ~p~n", [PostKnown]),
    ?line ?t:format("PostAreas = ~p~n", [PostAreas]),
    ?line true = length(PostKnown) =< length(PreKnown),
    ?line nc_refc_check(node()),
    erts_debug:set_internal_state(node_tab_delayed_delete, -1), %% restore original value
    ?line ok.

make_node_garbage(N, L, I, Ps) when N < L ->
    ?line Self = self(),
    ?line P = spawn_link(fun () ->
				 % Generate two node entries and one dist
				 % entry per node name
				 ?line PL1 = make_faked_pid_list(N,
								 I div 2,
								 1),
				 ?line put(a, PL1),
				 ?line PL2 = make_faked_pid_list(N,
								 I div 2,
								 2),
				 ?line put(b, PL2),
				 ?line Self ! {self(), length(nodes(known))}
			 end),
    ?line receive
	      {P, KnownLength} ->
		  ?line true = KnownLength >= I div 2
	  end,
    ?line make_node_garbage(N+(I div 2)*2, L, I, [P|Ps]);
make_node_garbage(_, _, _, Ps) ->
    %% Cleanup garbage...
    ProcIsCleanedUp
	= fun (Proc) ->
		  undefined == erts_debug:get_internal_state({process_status,
							      Proc})
	  end,
    lists:foreach(fun (P) -> wait_until(fun () -> ProcIsCleanedUp(P) end) end,
		  Ps),
    ?line ok.


make_faked_pid_list(Start, No, Creation) ->
    make_faked_pid_list(Start, No, Creation, []).

make_faked_pid_list(_Start, 0, _Creation, Acc) ->
    Acc;
make_faked_pid_list(Start, No, Creation, Acc) ->
    make_faked_pid_list(Start+1,
			No-1,
			Creation,
			[mk_pid({"faked_node-"
				 ++ integer_to_list(Start rem 50000)
				 ++ "@"
				 ++ atom_to_list(?MODULE),
				 Creation},
				4711,
				3) | Acc]).

%%
%% Test case: dist_link_refc
%%
dist_link_refc(doc) ->
    ["Tests that external reference counts are incremented and decremented "
     "as they should for distributed links"];
dist_link_refc(suite) -> [];
dist_link_refc(Config) when is_list(Config) ->
    ?line NodeFirstName = get_nodefirstname(),
    ?line ?line {ok, Node} = start_node(NodeFirstName),
    ?line RP = spawn_execer(Node),
    ?line LP = spawn_link_execer(node()),
    ?line true = sync_exec(RP, fun () -> link(LP) end),
    ?line wait_until(fun () ->
			     ?line {links, Links} = process_info(LP, links),
			     ?line lists:member(RP, Links)
		     end),
    ?line NodeCre = sync_exec(RP, fun() -> erlang:system_info(creation) end),
    ?line 1 = reference_type_count(
		link,
		refering_entity_id({process, LP},
				   get_node_references({Node, NodeCre}))),
    ?line exec(RP, fun() -> exit(normal) end),
    ?line wait_until(fun () ->
			     ?line {links, Links} = process_info(LP, links),
			     ?line not lists:member(RP, Links)
		     end),
    ?line 0 = reference_type_count(
		link,
		refering_entity_id({process, LP},
				   get_node_references({Node, NodeCre}))),
    ?line exit(LP, normal),
    ?line stop_node(Node),
    ?line nc_refc_check(node()),
    ?line ok.


%%
%% Test case: dist_monitor_refc
%%
dist_monitor_refc(doc) ->
    ["Tests that external reference counts are incremented and decremented "
     "as they should for distributed monitors"];
dist_monitor_refc(suite) -> [];
dist_monitor_refc(Config) when is_list(Config) ->
    ?line NodeFirstName = get_nodefirstname(),
    ?line {ok, Node} = start_node(NodeFirstName),
    ?line RP = spawn_execer(Node),
    ?line LP = spawn_link_execer(node()),
    ?line RMon = sync_exec(RP, fun () -> erlang:monitor(process, LP) end),
    ?line true = is_reference(RMon),
    ?line LMon = sync_exec(LP, fun () -> erlang:monitor(process, RP) end),
    ?line true = is_reference(LMon),
    ?line NodeCre = sync_exec(RP, fun() -> erlang:system_info(creation) end),
    ?line wait_until(fun () ->
			     ?line {monitored_by, MonBy}
				 = process_info(LP, monitored_by),
			     ?line {monitors, Mon}
				 = process_info(LP, monitors),
			     ?line (lists:member(RP, MonBy)
				    and lists:member({process,RP}, Mon))
		     end),
    ?line 3 = reference_type_count(
		monitor,
		refering_entity_id({process, LP},
				   get_node_references({Node, NodeCre}))),
    ?line exec(RP, fun () -> exit(normal) end),
    ?line wait_until(fun () ->
			     ?line {monitored_by, MonBy}
				 = process_info(LP, monitored_by),
			     ?line {monitors, Mon}
				 = process_info(LP, monitors),
			     ?line ((not lists:member(RP, MonBy))
				    and (not lists:member({process,RP}, Mon)))
		     end),
    ?line ok = sync_exec(LP,
			 fun () ->
				 receive
				     {'DOWN', LMon, process, _, _} ->
					 ok
				 end
			 end),
    ?line 0 = reference_type_count(
		link,
		refering_entity_id({process, LP},
				   get_node_references({Node, NodeCre}))),
    ?line exit(LP, normal),
    ?line stop_node(Node),
    ?line nc_refc_check(node()),
    ?line ok.


%%
%% Test case: node_controller_refc
%%
node_controller_refc(doc) ->
    ["Tests that external reference counts are incremented and decremented "
     "as they should for entities controlling a connections."];
node_controller_refc(suite) -> [];
node_controller_refc(Config) when is_list(Config) ->
    erts_debug:set_internal_state(available_internal_state, true),
    erts_debug:set_internal_state(node_tab_delayed_delete, 0),
    ?line NodeFirstName = get_nodefirstname(),
    ?line ?line {ok, Node} = start_node(NodeFirstName),
    ?line true = lists:member(Node, nodes()),
    ?line 1 = reference_type_count(control, get_dist_references(Node)),
    ?line P = spawn_link_execer(node()),
    ?line Node
	= sync_exec(P,
		    fun () ->
			    put(remote_net_kernel,
				rpc:call(Node,erlang,whereis,[net_kernel])),
			    node(get(remote_net_kernel))
		    end),
    ?line Creation = rpc:call(Node, erlang, system_info, [creation]),
    ?line monitor_node(Node,true),
    ?line stop_node(Node),
    ?line receive {nodedown, Node} -> ok end,
    ?line DistRefs = get_dist_references(Node),
    ?line true = reference_type_count(node, DistRefs) > 0,
    ?line 0 = reference_type_count(control, DistRefs),
    % Get rid of all references to Node
    ?line exec(P, fun () -> exit(normal) end),
    ?line wait_until(fun () -> not is_process_alive(P) end),
    lists:foreach(fun (Proc) -> garbage_collect(Proc) end, processes()),
    ?line false = get_node_references({Node,Creation}),
    ?line false = get_dist_references(Node),
    ?line false = lists:member(Node, nodes(known)),
    ?line nc_refc_check(node()),
    erts_debug:set_internal_state(node_tab_delayed_delete, -1), %% restore original value
    ?line ok.

%%
%% Test case: ets_refc
%%
ets_refc(doc) ->
    ["Tests that external reference counts are incremented and decremented "
     "as they should for data stored in ets tables."];
ets_refc(suite) -> [];
ets_refc(Config) when is_list(Config) ->
    ?line RNode = {get_nodename(), 1},
    ?line RPid = mk_pid(RNode, 4711, 2),
    ?line RPort = mk_port(RNode, 4711),
    ?line RRef = mk_ref(RNode, [4711, 47, 11]),
    ?line Tab = ets:new(ets_refc, []),
    ?line 0 = reference_type_count(ets, get_node_references(RNode)),
    ?line true = ets:insert(Tab, [{a, self()},
				  {b, RPid},
				  {c, hd(erlang:ports())},
				  {d, RPort},
				  {e, make_ref()}]),
    ?line 2 = reference_type_count(ets, get_node_references(RNode)),
    ?line true = ets:insert(Tab, {f, RRef}),
    ?line 3 = reference_type_count(ets, get_node_references(RNode)),
    ?line true = ets:delete(Tab, d),
    ?line 2 = reference_type_count(ets, get_node_references(RNode)),
    ?line true = ets:delete_all_objects(Tab),
    ?line 0 = reference_type_count(ets, get_node_references(RNode)),
    ?line true = ets:insert(Tab, [{b, RPid}, {e, make_ref()}]),
    ?line 1 = reference_type_count(ets, get_node_references(RNode)),
    ?line true = ets:delete(Tab),
    ?line 0 = reference_type_count(ets, get_node_references(RNode)),
    ?line nc_refc_check(node()),
    ?line ok.

%%
%% Test case: match_spec_refc
%%
match_spec_refc(doc) ->
    ["Tests that external reference counts are incremented and decremented "
     "as they should for data stored in match specifications."];
match_spec_refc(suite) -> [];
match_spec_refc(Config) when is_list(Config) ->
    ?line RNode = {get_nodename(), 1},
    ?line RPid = mk_pid(RNode, 4711, 2),
    ?line RPort = mk_port(RNode, 4711),
    ?line RRef = mk_ref(RNode, [4711, 47, 11]),
    ?line ok = do_match_spec_test(RNode, RPid, RPort, RRef),
    ?line garbage_collect(),
    ?line NodeRefs = get_node_references(RNode),
    ?line 0 = reference_type_count(binary, NodeRefs),
    ?line 0 = reference_type_count(ets, NodeRefs),
    ?line nc_refc_check(node()),
    ?line ok.

do_match_spec_test(RNode, RPid, RPort, RRef) ->
    ?line Tab = ets:new(match_spec_refc, []),
    ?line true = ets:insert(Tab, [{a, RPid, RPort, RRef},
				  {b, self(), RPort, RRef},
				  {c, RPid, RPort, make_ref()},
				  {d, RPid, RPort, RRef}]),
    ?line {M1, C1} = ets:select(Tab, [{{'$1',RPid,RPort,RRef},[],['$1']}], 1),
    ?line NodeRefs = get_node_references(RNode),
    ?line 3 = reference_type_count(binary, NodeRefs),
    ?line 10 = reference_type_count(ets, NodeRefs),
    ?line {M2, C2} = ets:select(C1),
    ?line '$end_of_table' = ets:select(C2),
    ?line ets:delete(Tab),
    ?line [a,d] = lists:sort(M1++M2),
    ?line ok.
    

%%
%% Test case: ets_refc
%%
timer_refc(doc) ->
    ["Tests that external reference counts are incremented and decremented "
     "as they should for data stored in bif timers."];
timer_refc(suite) -> [];
timer_refc(Config) when is_list(Config) ->
    ?line RNode = {get_nodename(), 1},
    ?line RPid = mk_pid(RNode, 4711, 2),
    ?line RPort = mk_port(RNode, 4711),
    ?line RRef = mk_ref(RNode, [4711, 47, 11]),
    ?line 0 = reference_type_count(timer, get_node_references(RNode)),
    ?line Pid = spawn(fun () -> receive after infinity -> ok end end),
    ?line erlang:start_timer(10000, Pid, {RPid, RPort, RRef}),
    ?line 3 = reference_type_count(timer, get_node_references(RNode)),
    ?line exit(Pid, kill),
    ?line Mon = erlang:monitor(process, Pid),
    ?line receive {'DOWN', Mon, process, Pid, _} -> ok end,
    ?line 0 = reference_type_count(timer, get_node_references(RNode)),
    ?line erlang:send_after(500, Pid, {timer, RPid, RPort, RRef}),
    ?line 0 = reference_type_count(timer, get_node_references(RNode)),
    ?line erlang:send_after(500, self(), {timer, RPid, RPort, RRef}),
    ?line erlang:send_after(400, bananfluga, {timer, RPid, RPort, RRef}),
    ?line 6 = reference_type_count(timer, get_node_references(RNode)),
    ?line receive {timer, RPid, RPort, RRef} -> ok end,
    ?line 0 = reference_type_count(timer, get_node_references(RNode)),
    ?line nc_refc_check(node()),
    ?line ok.

otp_4715(doc) -> [];
otp_4715(suite) -> [];
otp_4715(Config) when is_list(Config) ->
    case ?t:is_release_available("r9b") of
	true -> otp_4715_1(Config);
	false -> {skip,"No R9B found"}
    end.

otp_4715_1(Config) ->
    case erlang:system_info(compat_rel) of
	9 ->
	    ?line run_otp_4715(Config);
	_ ->
	    ?line Pa = filename:dirname(code:which(?MODULE)),
	    ?line ?t:run_on_shielded_node(fun () ->
						  run_otp_4715(Config)
					  end,
					  "+R9 -pa " ++ Pa)
    end.

run_otp_4715(Config) when is_list(Config) ->
    ?line erts_debug:set_internal_state(available_internal_state, true),
    ?line PidList = [mk_pid({a@b, 1}, 4710, 2),
		     mk_pid({a@b, 1}, 4712, 1),
		     mk_pid({c@b, 1}, 4711, 1),
		     mk_pid({b@b, 3}, 4711, 1),
		     mk_pid({b@b, 2}, 4711, 1)],

    ?line R9Sorted = old_mod:sort_on_old_node(PidList),
    ?line R9Sorted = lists:sort(PidList).

pid_wrap(doc) -> [];
pid_wrap(suite) -> [];
pid_wrap(Config) when is_list(Config) -> ?line pp_wrap(pid).

port_wrap(doc) -> [];
port_wrap(suite) -> [];
port_wrap(Config) when is_list(Config) ->
    ?line case ?t:os_type() of
	      {unix, _} ->
		  ?line pp_wrap(port);
	      _ ->
		  ?line {skip, "Only run on unix"}
	  end.

get_next_id(pid) ->
    erts_debug:get_internal_state(next_pid);
get_next_id(port) ->
    erts_debug:get_internal_state(next_port).

set_next_id(pid, N) ->
    erts_debug:set_internal_state(next_pid, N);
set_next_id(port, N) ->
    erts_debug:set_internal_state(next_port, N).

pp_wrap(What) ->
    ?line N = set_high_pp_next(What),
    ?line Cre = N + 100,
    ?line ?t:format("no creations = ~p~n", [Cre]),
    ?line PreCre = get_next_id(What),
    ?line ?t:format("pre creations = ~p~n", [PreCre]),
    ?line true = is_integer(PreCre),
    ?line do_pp_creations(What, Cre),
    ?line PostCre = get_next_id(What),
    ?line ?t:format("post creations = ~p~n", [PostCre]),
    ?line true = is_integer(PostCre),
    ?line true = PreCre > PostCre,
    ?line Now = set_next_id(What, ?MAX_PIDS_PORTS div 2),
    ?line ?t:format("reset to = ~p~n", [Now]),
    ?line true = is_integer(Now),
    ?line ok.

set_high_pp_next(What) ->
    ?line set_high_pp_next(What, ?MAX_PIDS_PORTS-1).
    
set_high_pp_next(What, N) ->
    ?line M = set_next_id(What, N),
    ?line true = is_integer(M),
    ?line case {M >= N, M =< ?MAX_PIDS_PORTS} of
	      {true, true} ->
		  ?line ?MAX_PIDS_PORTS - M + 1;
	      _ ->
		  ?line set_high_pp_next(What, N - 100)
	  end.

do_pp_creations(_What, N) when is_integer(N), N =< 0 ->
    ?line done;
do_pp_creations(pid, N) when is_integer(N) ->
    %% Create new pid and make sure it works...
    ?line Me = self(),
    ?line Ref = make_ref(),
    ?line Pid = spawn_link(fun () ->
				   receive
				       Ref ->
					   Me ! Ref
				   end
			   end),
    ?line Pid ! Ref,
    ?line receive
	      Ref ->
		  ?line do_pp_creations(pid, N - 1)
	  end;
do_pp_creations(port, N) when is_integer(N) ->
    %% Create new port and make sure it works...
    ?line "hej" = os:cmd("echo hej") -- "\n",
    ?line do_pp_creations(port, N - 1).

bad_nc(doc) -> [];
bad_nc(suite) -> [];
bad_nc(Config) when is_list(Config) ->
    % Make sure emulator don't crash on bad node containers...
    ?line MaxPidNum = (1 bsl 15) - 1,
    ?line MaxPidSer = ?MAX_PIDS_PORTS bsr 15,
    ?line ThisNode = {node(), erlang:system_info(creation)},
    ?line {'EXIT', {badarg, mk_pid, _}}
	= (catch mk_pid(ThisNode, MaxPidNum + 1, 17)),
    ?line {'EXIT', {badarg, mk_pid, _}}
	= (catch mk_pid(ThisNode, 4711, MaxPidSer + 1)),
    ?line {'EXIT', {badarg, mk_port, _}}
	= (catch mk_port(ThisNode, ?MAX_PIDS_PORTS + 1)),
    ?line {'EXIT', {badarg, mk_ref, _}}
	= (catch mk_ref(ThisNode,[(1 bsl 18), 4711, 4711])),
    ?line {'EXIT', {badarg, mk_ref, _}}
	= (catch mk_ref(ThisNode, [4711, 4711, 4711, 4711, 4711, 4711, 4711])),
    ?line RemNode = {x@y, 2},
    ?line {'EXIT', {badarg, mk_pid, _}}
	= (catch mk_pid(RemNode, MaxPidNum + 1, MaxPidSer)),
    ?line {'EXIT', {badarg, mk_pid, _}}
	= (catch mk_pid(RemNode, MaxPidNum, MaxPidSer + 1)),
    ?line {'EXIT', {badarg, mk_port, _}}
	= (catch mk_port(RemNode, ?MAX_PIDS_PORTS + 1)),
    ?line {'EXIT', {badarg, mk_ref, _}}
	= (catch mk_ref(RemNode, [(1 bsl 18), 4711, 4711])),
    ?line {'EXIT', {badarg, mk_ref, _}}
	= (catch mk_ref(RemNode, [4711, 4711, 4711, 4711, 4711, 4711, 4711])),
    ?line BadNode = {x@y, 4},
    ?line {'EXIT', {badarg, mk_pid, _}}
	= (catch mk_pid(BadNode, 4711, 17)),
    ?line {'EXIT', {badarg, mk_port, _}}
	= (catch mk_port(BadNode, 4711)),
    ?line {'EXIT', {badarg, mk_ref, _}}
	= (catch mk_ref(BadNode, [4711, 4711, 17])),
    ?line ok.



-define(NO_PIDS, 1000000).

unique_pid(doc) -> [];
unique_pid(suite) -> [];
unique_pid(Config) when is_list(Config) ->
    case catch erlang:system_info(modified_timing_level) of
	Level when is_integer(Level) ->
	    {skip,
	     "Modified timing (level " ++ integer_to_list(Level)
	     ++ ") is enabled. spawn() is too slow for this "
	     " test when modified timing is enabled."};
	_ ->
	    ?line ?NO_PIDS = length(lists:usort(mkpidlist(?NO_PIDS, []))),
	    ?line ok
    end.
    
mkpidlist(0, Ps) -> Ps;
mkpidlist(N, Ps) -> mkpidlist(N-1, [spawn(fun () -> ok end)|Ps]).


iter_max_procs(doc) -> [];
iter_max_procs(suite) -> [];
iter_max_procs(Config) when is_list(Config) ->
    ?line NoMoreTests = make_ref(),
    ?line erlang:send_after(10000, self(), NoMoreTests),
    ?line Res = chk_max_proc_line(),
    ?line Res = chk_max_proc_line(),
    ?line done = chk_max_proc_line_until(NoMoreTests, Res),
    ?line {comment,
	   io_lib:format("max processes = ~p; "
			 "process line length = ~p",
			 [element(2, Res), element(1, Res)])}.
    
    
max_proc_line(Root, Parent, N) ->
    Me = self(),
    case catch spawn_link(fun () -> max_proc_line(Root, Me, N+1) end) of
	{'EXIT', {system_limit, _}} when Root /= self() ->
	    Root ! {proc_line_length, N, self()},
	    receive remove_proc_line -> Parent ! {exiting, Me} end;
	P when is_pid(P), Root =/= self() ->
	    receive {exiting, P} -> Parent ! {exiting, Me} end;
	P when is_pid(P) ->
	    P;
	Unexpected ->
	    exit({unexpected_spawn_result, Unexpected})
    end.

chk_max_proc_line() ->
    ?line Child = max_proc_line(self(), self(), 0),
    ?line receive
	      {proc_line_length, PLL, End} ->
		  ?line PC = erlang:system_info(process_count),
		  ?line LP = length(processes()),
		  ?line ?t:format("proc line length = ~p; "
				  "process count = ~p; "
				  "length processes = ~p~n",
				  [PLL, PC, LP]),
		  ?line End ! remove_proc_line,
		  ?line PC = LP,
		  ?line receive {exiting, Child} -> ok end,
		  ?line {PLL, PC}
	  end.

chk_max_proc_line_until(NoMoreTests, Res) ->
    receive
	NoMoreTests ->
	    ?line done
    after 0 ->
	    ?line Res = chk_max_proc_line(),
	    ?line chk_max_proc_line_until(NoMoreTests, Res)
    end.

%%
%% -- Internal utils ---------------------------------------------------------
%%

-define(ND_REFS, erts_debug:get_internal_state(node_and_dist_references)).

node_container_refc_check(Node) when is_atom(Node) ->
    AIS = available_internal_state(true),
    nc_refc_check(Node),
    available_internal_state(AIS).

nc_refc_check(Node) when is_atom(Node) ->
    Ref = make_ref(),
    Self = self(),
    ?t:format("Starting reference count check of node ~w~n", [Node]),
    spawn_link(Node,
	       fun () ->
		       {{node_references, NodeRefs},
			{dist_references, DistRefs}} = ?ND_REFS,
		       check_nd_refc({node(), erlang:system_info(creation)},
				     NodeRefs,
				     DistRefs,
				     fun (ErrMsg) ->
					     Self ! {Ref, ErrMsg, failed},
					     exit(normal)
				     end),
		       Self ! {Ref, succeded}
	       end),
    receive
	{Ref, ErrorMsg, failed} ->
	    ?t:format("~s~n", [ErrorMsg]),
	    ct:fail(reference_count_check_failed);
	{Ref, succeded} ->
	    ?t:format("Reference count check of node ~w succeded!~n", [Node]),
	    ok
    end.

check_nd_refc({ThisNodeName, ThisCreation}, NodeRefs, DistRefs, Fail) ->
    case catch begin
		   check_refc(ThisNodeName,ThisCreation,"node table",NodeRefs),
		   check_refc(ThisNodeName,ThisCreation,"dist table",DistRefs),
		   ok
	       end of
	ok ->
	    ok;
	{'EXIT', Reason} ->
	    {Y,Mo,D} = date(),
	    {H,Mi,S} = time(),
	    ErrMsg = io_lib:format("~n"
				   "*** Reference count check of node ~w "
				   "failed (~p) at ~w~w~w ~w:~w:~w~n"
				   "*** Node table references:~n ~p~n"
				   "*** Dist table references:~n ~p~n",
				   [node(), Reason, Y, Mo, D, H, Mi, S,
				    NodeRefs, DistRefs]),
	    Fail(lists:flatten(ErrMsg))
    end.


check_refc(ThisNodeName,ThisCreation,Table,EntryList) when is_list(EntryList) ->
    lists:foreach(
      fun ({Entry, Refc, ReferrerList}) ->
	      {DelayedDeleteTimer,
	       FoundRefs} =
		  lists:foldl(
		    fun ({Referrer, ReferencesList}, {DDT, A1}) ->
			    {case Referrer of
				 {system,delayed_delete_timer} ->
				     true;
				 _ ->
				     DDT
			     end,
			     A1 + lists:foldl(fun ({_T,Rs},A2) ->
						      A2+Rs
					      end,
					      0,
					      ReferencesList)}
		    end,
		    {false, 0},
		    ReferrerList),
	      
	      %% Reference count equals found references?
	      case {Refc, FoundRefs, DelayedDeleteTimer} of
		  {X, X, _} ->
		      ok;
		  {0, 1, true} ->
		      ok;
		  _ ->
		      exit({invalid_reference_count, Table, Entry})
	      end,

	      %% All entries in table referred to?
	      case {Entry, Refc} of
		  {ThisNodeName, 0} -> ok;
		  {{ThisNodeName, ThisCreation}, 0} -> ok;
		  {_, 0} when DelayedDeleteTimer == false ->
		      exit({not_referred_entry_in_table, Table, Entry});
		  {_, _} -> ok 
	      end

      end,
      EntryList),
    ok.

get_node_references({NodeName, Creation} = Node) when is_atom(NodeName),
						      is_integer(Creation) ->
    {{node_references, NodeRefs},
	   {dist_references, DistRefs}} = ?ND_REFS,
    check_nd_refc({node(), erlang:system_info(creation)},
			NodeRefs,
			DistRefs,
			fun (ErrMsg) ->
				?t:format("~s", [ErrMsg]),
				ct:fail(reference_count_check_failed)
			end),
    find_references(Node, NodeRefs).

get_dist_references(NodeName) when is_atom(NodeName) ->
    ?line {{node_references, NodeRefs},
	   {dist_references, DistRefs}} = ?ND_REFS,
    ?line check_nd_refc({node(), erlang:system_info(creation)},
			NodeRefs,
			DistRefs,
			fun (ErrMsg) ->
				?line ?t:format("~s", [ErrMsg]),
				?line ct:fail(reference_count_check_failed)
			end),
    ?line find_references(NodeName, DistRefs).

find_references(N, NRefList) ->
    case lists:keysearch(N, 1, NRefList) of
	      {value, {N, _, ReferrersList}} -> ReferrersList;
	      _ -> false
	  end.

%% Currently unused
% refering_entity_type(RefererType, ReferingEntities) ->
%     lists:filter(fun ({{RT, _}, _}) when RT == RefererType ->
% 			 true;
% 		     (_) ->
% 			 false
% 		 end,
% 		 ReferingEntities).

refering_entity_id(ReferingEntityId, [{ReferingEntityId,_} = ReferingEntity
				      | _ReferingEntities]) ->
    ReferingEntity;
refering_entity_id(ReferingEntityId, [_ | ReferingEntities]) ->
    refering_entity_id(ReferingEntityId, ReferingEntities);
refering_entity_id(_, []) ->
    false.

reference_type_count(_, false) ->
    0;
reference_type_count(Type, {_, _ReferenceCountList} = ReferingEntity) ->
    reference_type_count(Type, [ReferingEntity]);
reference_type_count(Type, ReferingEntities) when is_list(ReferingEntities) ->
    lists:foldl(fun ({_, ReferenceCountList}, Acc1) ->
			lists:foldl(fun ({T, N}, Acc2) when T == Type ->
					    N + Acc2;
					(_, Acc2) ->
					    Acc2
				    end,
				    Acc1,
				    ReferenceCountList)
		end,
		0,
		ReferingEntities).


start_node(Name, Args) ->
    ?line Pa = filename:dirname(code:which(?MODULE)),
    ?line Res = test_server:start_node(Name,
				       slave,
				       [{args, "-pa "++Pa++" "++Args}]),
    ?line {ok, Node} = Res,
    ?line rpc:call(Node, erts_debug, set_internal_state,
		   [available_internal_state, true]),
    ?line Res.
    
start_node(Name) ->
    ?line start_node(Name, "").

stop_node(Node) ->
    ?line nc_refc_check(Node),
    ?line true = test_server:stop_node(Node).

hostname() ->
    from($@, atom_to_list(node())).

from(H, [H | T]) -> T;
from(H, [_ | T]) -> from(H, T);
from(_H, []) -> [].

wait_until(Pred) ->
    case Pred() of
	true -> ok;
	false -> receive after 100 -> wait_until(Pred) end
    end.

get_nodefirstname_string() ->
    atom_to_list(?MODULE)
	++ "-"
	++ integer_to_list(erlang:system_time(seconds))
	++ "-"
	++ integer_to_list(erlang:unique_integer([positive])).

get_nodefirstname() ->
    list_to_atom(get_nodefirstname_string()).

get_nodename() ->
    list_to_atom(get_nodefirstname_string()
		 ++ "@"
		 ++ hostname()).
    


-define(VERSION_MAGIC,       131).

-define(ATOM_EXT,            100).
-define(REFERENCE_EXT,       101).
-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) ->
    mk_pid({atom_to_list(NodeName), Creation}, Number, Serial);
mk_pid({NodeName, Creation}, Number, Serial) ->
    case catch binary_to_term(list_to_binary([?VERSION_MAGIC,
					?PID_EXT,
					?ATOM_EXT,
					uint16_be(length(NodeName)),
					NodeName,
					uint32_be(Number),
					uint32_be(Serial),
					uint8(Creation)])) of
	Pid when is_pid(Pid) ->
	    Pid;
	{'EXIT', {badarg, _}} ->
	    exit({badarg, mk_pid, [{NodeName, Creation}, Number, Serial]});
	Other ->
	    exit({unexpected_binary_to_term_result, Other})
    end.

mk_port({NodeName, Creation}, Number) when is_atom(NodeName) ->
    mk_port({atom_to_list(NodeName), Creation}, Number);
mk_port({NodeName, Creation}, Number) ->
    case catch binary_to_term(list_to_binary([?VERSION_MAGIC,
					      ?PORT_EXT,
					      ?ATOM_EXT,
					      uint16_be(length(NodeName)),
					      NodeName,
					      uint32_be(Number),
					      uint8(Creation)])) of
	Port when is_port(Port) ->
	    Port;
	{'EXIT', {badarg, _}} ->
	    exit({badarg, mk_port, [{NodeName, 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) ->
    mk_ref({atom_to_list(NodeName), Creation}, Numbers);
mk_ref({NodeName, Creation}, [Number]) when is_list(NodeName),
					    is_integer(Creation),
					    is_integer(Number) ->
    case catch binary_to_term(list_to_binary([?VERSION_MAGIC,
					      ?REFERENCE_EXT,
					      ?ATOM_EXT,
					      uint16_be(length(NodeName)),
					      NodeName,
					      uint32_be(Number),
					      uint8(Creation)])) of
	Ref when is_reference(Ref) ->
	    Ref;
	{'EXIT', {badarg, _}} ->
	    exit({badarg, mk_ref, [{NodeName, Creation}, [Number]]});
	Other ->
	    exit({unexpected_binary_to_term_result, Other})
    end;
mk_ref({NodeName, Creation}, Numbers) when is_list(NodeName),
					   is_integer(Creation),
					   is_list(Numbers) ->
    case catch binary_to_term(list_to_binary([?VERSION_MAGIC,
					      ?NEW_REFERENCE_EXT,
					      uint16_be(length(Numbers)),
					      ?ATOM_EXT,
					      uint16_be(length(NodeName)),
					      NodeName,
					      uint8(Creation),
					      lists:map(fun (N) ->
								uint32_be(N)
							end,
							Numbers)])) of
	Ref when is_reference(Ref) ->
	    Ref;
	{'EXIT', {badarg, _}} ->
	    exit({badarg, mk_ref, [{NodeName, Creation}, Numbers]});
	Other ->
	    exit({unexpected_binary_to_term_result, Other})
    end.

exec_loop() ->
    receive
	{exec_fun, Fun} when is_function(Fun) ->
	    Fun();
	{sync_exec_fun, From, Fun} when is_pid(From), is_function(Fun)  ->
	    From ! {sync_exec_fun_res, self(), Fun()}
    end,
    exec_loop().

spawn_execer(Node) ->
    spawn(Node, fun () -> exec_loop() end).

spawn_link_execer(Node) ->
    spawn_link(Node, fun () -> exec_loop() end).

exec(Pid, Fun) when is_pid(Pid), is_function(Fun) ->
    Pid ! {exec_fun, Fun}.

sync_exec(Pid, Fun) when is_pid(Pid), is_function(Fun) ->
    Pid ! {sync_exec_fun, self(), Fun},
    receive
	{sync_exec_fun_res, Pid, Res} ->
	    Res
    end.