summaryrefslogtreecommitdiff
path: root/test/ruby/test_thread.rb
blob: 591292962dca6b67277a3844f1bcf57bdb5dd3e1 (plain)
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
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
# -*- coding: us-ascii -*-
# frozen_string_literal: false
require 'test/unit'

class TestThread < Test::Unit::TestCase
  class Thread < ::Thread
    Threads = []
    def self.new(*)
      th = super
      Threads << th
      th
    end
  end

  def setup
    Thread::Threads.clear
  end

  def teardown
    Thread::Threads.each do |t|
      t.kill if t.alive?
      begin
        t.join
      rescue Exception
      end
    end
  end

  def test_inspect
    th = Module.new {break module_eval("class C\u{30b9 30ec 30c3 30c9} < Thread; self; end")}.start{}
    assert_match(/::C\u{30b9 30ec 30c3 30c9}:/, th.inspect)
  ensure
    th.join
  end

  def test_inspect_with_fiber
    inspect1 = inspect2 = nil

    Thread.new{
      inspect1 = Thread.current.inspect
      Fiber.new{
        inspect2 = Thread.current.inspect
      }.resume
    }.join

    assert_equal inspect1, inspect2, '[Bug #13689]'
  end

  def test_main_thread_variable_in_enumerator
    assert_equal Thread.main, Thread.current

    Thread.current.thread_variable_set :foo, "bar"

    thread, value = Fiber.new {
      Fiber.yield [Thread.current, Thread.current.thread_variable_get(:foo)]
    }.resume

    assert_equal Thread.current, thread
    assert_equal Thread.current.thread_variable_get(:foo), value
  end

  def test_thread_variable_in_enumerator
    Thread.new {
      Thread.current.thread_variable_set :foo, "bar"

      thread, value = Fiber.new {
        Fiber.yield [Thread.current, Thread.current.thread_variable_get(:foo)]
      }.resume

      assert_equal Thread.current, thread
      assert_equal Thread.current.thread_variable_get(:foo), value
    }.join
  end

  def test_thread_variables
    assert_equal [], Thread.new { Thread.current.thread_variables }.join.value

    t = Thread.new {
      Thread.current.thread_variable_set(:foo, "bar")
      Thread.current.thread_variables
    }
    assert_equal [:foo], t.join.value
  end

  def test_thread_variable?
    Thread.new { assert_not_send([Thread.current, :thread_variable?, "foo"]) }.value
    t = Thread.new {
      Thread.current.thread_variable_set("foo", "bar")
    }.join

    assert_send([t, :thread_variable?, "foo"])
    assert_send([t, :thread_variable?, :foo])
    assert_not_send([t, :thread_variable?, :bar])
  end

  def test_thread_variable_strings_and_symbols_are_the_same_key
    t = Thread.new {}.join
    t.thread_variable_set("foo", "bar")
    assert_equal "bar", t.thread_variable_get(:foo)
  end

  def test_thread_variable_frozen
    t = Thread.new { }.join
    t.freeze
    assert_raise(FrozenError) do
      t.thread_variable_set(:foo, "bar")
    end
  end

  def test_mutex_synchronize
    m = Thread::Mutex.new
    r = 0
    num_threads = 10
    loop=100
    (1..num_threads).map{
      Thread.new{
        loop.times{
          m.synchronize{
            tmp = r
            # empty and waste loop for making thread preemption
            100.times {
            }
            r = tmp + 1
          }
        }
      }
    }.each{|e|
      e.join
    }
    assert_equal(num_threads*loop, r)
  end

  def test_mutex_synchronize_yields_no_block_params
    bug8097 = '[ruby-core:53424] [Bug #8097]'
    assert_empty(Thread::Mutex.new.synchronize {|*params| break params}, bug8097)
  end

  def test_local_barrier
    dir = File.dirname(__FILE__)
    lbtest = File.join(dir, "lbtest.rb")
    $:.unshift File.join(File.dirname(dir), 'ruby')
    $:.shift
    3.times {
      `#{EnvUtil.rubybin} #{lbtest}`
      assert_not_predicate($?, :coredump?, '[ruby-dev:30653]')
    }
  end

  def test_priority
    c1 = c2 = 0
    run = true
    t1 = Thread.new { c1 += 1 while run }
    t1.priority = 3
    t2 = Thread.new { c2 += 1 while run }
    t2.priority = -3
    assert_equal(3, t1.priority)
    assert_equal(-3, t2.priority)
    sleep 0.5
    5.times do
      assert_not_predicate(t1, :stop?)
      assert_not_predicate(t2, :stop?)
      break if c1 > c2
      sleep 0.1
    end
    run = false
    t1.kill
    t2.kill
    assert_operator(c1, :>, c2, "[ruby-dev:33124]") # not guaranteed
  end

  def test_new
    assert_raise(ThreadError) do
      Thread.new
    end

    t1 = Thread.new { sleep }
    assert_raise(ThreadError) do
      t1.instance_eval { initialize { } }
    end

    t2 = Thread.new(&method(:sleep).to_proc)
    assert_raise(ThreadError) do
      t2.instance_eval { initialize { } }
    end

  ensure
    t1.kill if t1
    t2.kill if t2
  end

  def test_new_symbol_proc
    bug = '[ruby-core:80147] [Bug #13313]'
    assert_ruby_status([], "#{<<-"begin;"}\n#{<<-'end;'}", bug)
    begin;
      exit("1" == Thread.start(1, &:to_s).value)
    end;
  end

  def test_join
    t = Thread.new { sleep }
    assert_nil(t.join(0.05))

  ensure
    t.kill if t
  end

  def test_join2
    ok = false
    t1 = Thread.new { ok = true; sleep }
    Thread.pass until ok
    Thread.pass until t1.stop?
    t2 = Thread.new do
      Thread.pass while ok
      t1.join(0.01)
    end
    t3 = Thread.new do
      ok = false
      t1.join
    end
    assert_nil(t2.value)
    t1.wakeup
    assert_equal(t1, t3.value)

  ensure
    t1.kill if t1
    t2.kill if t2
    t3.kill if t3
  end

  def test_kill_main_thread
    assert_in_out_err([], <<-INPUT, %w(1), [])
      p 1
      Thread.kill Thread.current
      p 2
    INPUT
  end

  def test_kill_wrong_argument
    bug4367 = '[ruby-core:35086]'
    assert_raise(TypeError, bug4367) {
      Thread.kill(nil)
    }
    o = Object.new
    assert_raise(TypeError, bug4367) {
      Thread.kill(o)
    }
  end

  def test_kill_thread_subclass
    c = Class.new(Thread)
    t = c.new { sleep 10 }
    assert_nothing_raised { Thread.kill(t) }
    assert_equal(nil, t.value)
  end

  def test_exit
    s = 0
    Thread.new do
      s += 1
      Thread.exit
      s += 2
    end.join
    assert_equal(1, s)
  end

  def test_wakeup
    s = 0
    t = Thread.new do
      s += 1
      Thread.stop
      s += 1
    end
    Thread.pass until t.stop?
    assert_equal(1, s)
    t.wakeup
    Thread.pass while t.alive?
    assert_equal(2, s)
    assert_raise(ThreadError) { t.wakeup }

  ensure
    t.kill if t
  end

  def test_stop
    assert_in_out_err([], <<-INPUT, %w(2), [])
      begin
        Thread.stop
        p 1
      rescue ThreadError
        p 2
      end
    INPUT
  end

  def test_list
    assert_in_out_err([], <<-INPUT) do |r, e|
      t1 = Thread.new { sleep }
      Thread.pass
      t2 = Thread.new { loop { Thread.pass } }
      Thread.new { }.join
      p [Thread.current, t1, t2].map{|t| t.object_id }.sort
      p Thread.list.map{|t| t.object_id }.sort
    INPUT
      assert_equal(r.first, r.last)
      assert_equal([], e)
    end
  end

  def test_main
    assert_in_out_err([], <<-INPUT, %w(true false), [])
      p Thread.main == Thread.current
      Thread.new { p Thread.main == Thread.current }.join
    INPUT
  end

  def test_abort_on_exception
    assert_in_out_err([], <<-INPUT, %w(false 1), [])
      p Thread.abort_on_exception
      begin
        t = Thread.new {
          Thread.current.report_on_exception = false
          raise
        }
        Thread.pass until t.stop?
        p 1
      rescue
        p 2
      end
    INPUT

    assert_in_out_err([], <<-INPUT, %w(true 2), [])
      Thread.abort_on_exception = true
      p Thread.abort_on_exception
      begin
        Thread.new {
          Thread.current.report_on_exception = false
          raise
        }
        sleep 0.5
        p 1
      rescue
        p 2
      end
    INPUT

    assert_in_out_err(%w(--disable-gems -d), <<-INPUT, %w(false 2), %r".+")
      p Thread.abort_on_exception
      begin
        t = Thread.new { raise }
        Thread.pass until t.stop?
        p 1
      rescue
        p 2
      end
    INPUT

    assert_in_out_err([], <<-INPUT, %w(false true 2), [])
      p Thread.abort_on_exception
      begin
        ok = false
        t = Thread.new {
          Thread.current.report_on_exception = false
          Thread.pass until ok
          raise
        }
        t.abort_on_exception = true
        p t.abort_on_exception
        ok = 1
        sleep 1
        p 1
      rescue
        p 2
      end
    INPUT
  end

  def test_report_on_exception
    assert_separately([], "#{<<~"begin;"}\n#{<<~'end;'}")
    begin;
      q1 = Thread::Queue.new
      q2 = Thread::Queue.new

      assert_equal(true, Thread.report_on_exception,
                   "global flag is true by default")
      assert_equal(true, Thread.current.report_on_exception,
                   "the main thread has report_on_exception=true")

      Thread.report_on_exception = true
      Thread.current.report_on_exception = false
      assert_equal(true,
                   Thread.start {Thread.current.report_on_exception}.value,
                  "should not inherit from the parent thread but from the global flag")

      assert_warn("", "exception should be ignored silently when false") {
        th = Thread.start {
          Thread.current.report_on_exception = false
          q1.push(Thread.current.report_on_exception)
          raise "report 1"
        }
        assert_equal(false, q1.pop)
        Thread.pass while th.alive?
      }

      assert_warn(/report 2/, "exception should be reported when true") {
        th = Thread.start {
          q1.push(Thread.current.report_on_exception = true)
          raise "report 2"
        }
        assert_equal(true, q1.pop)
        Thread.pass while th.alive?
      }

      assert_warn("", "the global flag should not affect already started threads") {
        Thread.report_on_exception = false
        th = Thread.start {
          q2.pop
          q1.push(Thread.current.report_on_exception)
          raise "report 3"
        }
        q2.push(Thread.report_on_exception = true)
        assert_equal(false, q1.pop)
        Thread.pass while th.alive?
      }

      assert_warn(/report 4/, "should defaults to the global flag at the start") {
        Thread.report_on_exception = true
        th = Thread.start {
          q1.push(Thread.current.report_on_exception)
          raise "report 4"
        }
        assert_equal(true, q1.pop)
        Thread.pass while th.alive?
      }

      assert_warn(/report 5/, "should first report and then raise with report_on_exception + abort_on_exception") {
        th = Thread.start {
          Thread.current.report_on_exception = true
          Thread.current.abort_on_exception = true
          q2.pop
          raise "report 5"
        }
        assert_raise_with_message(RuntimeError, "report 5") {
          q2.push(true)
          Thread.pass while th.alive?
        }
      }
    end;
  end

  def test_status_and_stop_p
    a = ::Thread.new {
      Thread.current.report_on_exception = false
      raise("die now")
    }
    b = Thread.new { Thread.stop }
    c = Thread.new { Thread.exit }
    e = Thread.current
    Thread.pass while a.alive? or !b.stop? or c.alive?

    assert_equal(nil, a.status)
    assert_predicate(a, :stop?)

    assert_equal("sleep", b.status)
    assert_predicate(b, :stop?)

    assert_equal(false, c.status)
    assert_match(/^#<TestThread::Thread:.* dead>$/, c.inspect)
    assert_predicate(c, :stop?)

    es1 = e.status
    es2 = e.stop?
    assert_equal(["run", false], [es1, es2])

  ensure
    a.kill if a
    b.kill if b
    c.kill if c
  end

  def test_switch_while_busy_loop
    bug1402 = "[ruby-dev:38319] [Bug #1402]"
    flag = true
    th = Thread.current
    waiter = Thread.start {
      sleep 0.1
      flag = false
      sleep 1
      th.raise(bug1402)
    }
    assert_nothing_raised(RuntimeError, bug1402) do
      nil while flag
    end
    assert(!flag, bug1402)
  ensure
    waiter.kill.join
  end

  def test_safe_level
    ok = false
    t = Thread.new do
      EnvUtil.suppress_warning do
        $SAFE = 1
      end
      ok = true
      sleep
    end
    Thread.pass until ok
    assert_equal(0, Thread.current.safe_level)
    assert_equal(1, t.safe_level)

  ensure
    t.kill if t
  end

  def test_thread_local
    t = Thread.new { sleep }

    assert_equal(false, t.key?(:foo))

    t["foo"] = "foo"
    t["bar"] = "bar"
    t["baz"] = "baz"

    assert_equal(true, t.key?(:foo))
    assert_equal(true, t.key?("foo"))
    assert_equal(false, t.key?(:qux))
    assert_equal(false, t.key?("qux"))

    assert_equal([:foo, :bar, :baz].sort, t.keys.sort)

  ensure
    t.kill if t
  end

  def test_thread_local_fetch
    t = Thread.new { sleep }

    assert_equal(false, t.key?(:foo))

    t["foo"] = "foo"
    t["bar"] = "bar"
    t["baz"] = "baz"

    x = nil
    assert_equal("foo", t.fetch(:foo, 0))
    assert_equal("foo", t.fetch(:foo) {x = true})
    assert_nil(x)
    assert_equal("foo", t.fetch("foo", 0))
    assert_equal("foo", t.fetch("foo") {x = true})
    assert_nil(x)

    x = nil
    assert_equal(0, t.fetch(:qux, 0))
    assert_equal(1, t.fetch(:qux) {x = 1})
    assert_equal(1, x)
    assert_equal(2, t.fetch("qux", 2))
    assert_equal(3, t.fetch("qux") {x = 3})
    assert_equal(3, x)

    e = assert_raise(KeyError) {t.fetch(:qux)}
    assert_equal(:qux, e.key)
    assert_equal(t, e.receiver)
  ensure
    t.kill if t
  end

  def test_thread_local_security
    Thread.new do
      Thread.current[:foo] = :bar
      Thread.current.freeze
      assert_raise(FrozenError) do
        Thread.current[:foo] = :baz
      end
    end.join
  end

  def test_thread_local_dynamic_symbol
    bug10667 = '[ruby-core:67185] [Bug #10667]'
    t = Thread.new {}.join
    key_str = "foo#{rand}"
    key_sym = key_str.to_sym
    t.thread_variable_set(key_str, "bar")
    assert_equal("bar", t.thread_variable_get(key_str), "#{bug10667}: string key")
    assert_equal("bar", t.thread_variable_get(key_sym), "#{bug10667}: symbol key")
  end

  def test_select_wait
    assert_nil(IO.select(nil, nil, nil, 0.001))
    t = Thread.new do
      IO.select(nil, nil, nil, nil)
    end
    Thread.pass until t.stop?
    assert_predicate(t, :alive?)
    t.kill
  end

  def test_mutex_deadlock
    m = Thread::Mutex.new
    m.synchronize do
      assert_raise(ThreadError) do
        m.synchronize do
          assert(false)
        end
      end
    end
  end

  def test_mutex_interrupt
    m = Thread::Mutex.new
    m.lock
    t = Thread.new do
      m.lock
      :foo
    end
    Thread.pass until t.stop?
    t.kill
    assert_nil(t.value)
  end

  def test_mutex_illegal_unlock
    m = Thread::Mutex.new
    m.lock
    Thread.new do
      assert_raise(ThreadError) do
        m.unlock
      end
    end.join
  end

  def test_mutex_fifo_like_lock
    m1 = Thread::Mutex.new
    m2 = Thread::Mutex.new
    m1.lock
    m2.lock
    m1.unlock
    m2.unlock
    assert_equal(false, m1.locked?)
    assert_equal(false, m2.locked?)

    m3 = Thread::Mutex.new
    m1.lock
    m2.lock
    m3.lock
    m1.unlock
    m2.unlock
    m3.unlock
    assert_equal(false, m1.locked?)
    assert_equal(false, m2.locked?)
    assert_equal(false, m3.locked?)
  end

  def test_mutex_trylock
    m = Thread::Mutex.new
    assert_equal(true, m.try_lock)
    assert_equal(false, m.try_lock, '[ruby-core:20943]')

    Thread.new{
      assert_equal(false, m.try_lock)
    }.join

    m.unlock
  end

  def test_recursive_outer
    arr = []
    obj = Struct.new(:foo, :visited).new(arr, false)
    arr << obj
    def obj.hash
      self[:visited] = true
      super
      raise "recursive_outer should short circuit intermediate calls"
    end
    assert_nothing_raised {arr.hash}
    assert(obj[:visited], "obj.hash was not called")
  end

  def test_thread_instance_variable
    bug4389 = '[ruby-core:35192]'
    assert_in_out_err([], <<-INPUT, %w(), [], bug4389)
      class << Thread.current
        @data = :data
      end
    INPUT
  end

  def test_no_valid_cfp
    skip 'with win32ole, cannot run this testcase because win32ole redefines Thread#initialize' if defined?(WIN32OLE)
    bug5083 = '[ruby-dev:44208]'
    assert_equal([], Thread.new(&Module.method(:nesting)).value, bug5083)
    assert_instance_of(Thread, Thread.new(:to_s, &Class.new.method(:undef_method)).join, bug5083)
  end

  def make_handle_interrupt_test_thread1 flag
    r = []
    ready_q = Queue.new
    done_q = Queue.new
    th = Thread.new{
      begin
        Thread.handle_interrupt(RuntimeError => flag){
          begin
            ready_q << true
            done_q.pop
          rescue
            r << :c1
          end
        }
      rescue
        r << :c2
      end
    }
    ready_q.pop
    th.raise
    begin
      done_q << true
      th.join
    rescue
      r << :c3
    end
    r
  end

  def test_handle_interrupt
    [[:never, :c2],
     [:immediate, :c1],
     [:on_blocking, :c1]].each{|(flag, c)|
      assert_equal([flag, c], [flag] + make_handle_interrupt_test_thread1(flag))
    }
    # TODO: complex cases are needed.
  end

  def test_handle_interrupt_invalid_argument
    assert_raise(ArgumentError) {
      Thread.handle_interrupt(RuntimeError => :immediate) # no block
    }
    assert_raise(ArgumentError) {
      Thread.handle_interrupt(RuntimeError => :xyzzy) {}
    }
    assert_raise(TypeError) {
      Thread.handle_interrupt([]) {} # array
    }
  end

  def for_test_handle_interrupt_with_return
    Thread.handle_interrupt(Object => :never){
      Thread.current.raise RuntimeError.new("have to be rescured")
      return
    }
  rescue
  end

  def test_handle_interrupt_with_return
    assert_nothing_raised do
      for_test_handle_interrupt_with_return
      _dummy_for_check_ints=nil
    end
  end

  def test_handle_interrupt_with_break
    assert_nothing_raised do
      begin
        Thread.handle_interrupt(Object => :never){
          Thread.current.raise RuntimeError.new("have to be rescured")
          break
        }
      rescue
      end
      _dummy_for_check_ints=nil
    end
  end

  def test_handle_interrupt_blocking
    r=:ng
    e=Class.new(Exception)
    th_s = Thread.current
    th = Thread.start{
      assert_raise(RuntimeError) {
        Thread.handle_interrupt(Object => :on_blocking){
          begin
            Thread.pass until r == :wait
            Thread.current.raise RuntimeError, "will raise in sleep"
            r = :ok
            sleep
          ensure
            th_s.raise e, "raise from ensure", $@
          end
        }
      }
    }
    assert_raise(e) {r = :wait; sleep 0.2}
    th.join
    assert_equal(:ok,r)
  end

  def test_handle_interrupt_and_io
    assert_in_out_err([], <<-INPUT, %w(ok), [])
      th_waiting = true

      t = Thread.new {
        Thread.current.report_on_exception = false
        Thread.handle_interrupt(RuntimeError => :on_blocking) {
          nil while th_waiting
          # async interrupt should be raised _before_ writing puts arguments
          puts "ng"
        }
      }

      Thread.pass while t.stop?
      t.raise RuntimeError
      th_waiting = false
      t.join rescue nil
      puts "ok"
    INPUT
  end

  def test_handle_interrupt_and_p
    assert_in_out_err([], <<-INPUT, %w(:ok :ok), [])
      th_waiting = false

      t = Thread.new {
        Thread.current.report_on_exception = false
        Thread.handle_interrupt(RuntimeError => :on_blocking) {
          th_waiting = true
          nil while th_waiting
          # p shouldn't provide interruptible point
          p :ok
          p :ok
        }
      }

      Thread.pass until th_waiting
      t.raise RuntimeError
      th_waiting = false
      t.join rescue nil
    INPUT
  end

  def test_handle_interrupted?
    q = Thread::Queue.new
    Thread.handle_interrupt(RuntimeError => :never){
      done = false
      th = Thread.new{
        q.push :e
        begin
          begin
            Thread.pass until done
          rescue => e
            q.push :ng1
          end
          begin
            Thread.handle_interrupt(Object => :immediate){} if Thread.pending_interrupt?
          rescue RuntimeError => e
            q.push :ok
          end
        rescue => e
          q.push :ng2
        ensure
          q.push :ng3
        end
      }
      q.pop
      th.raise
      done = true
      th.join
      assert_equal(:ok, q.pop)
    }
  end

  def test_thread_timer_and_ensure
    assert_normal_exit(<<_eom, 'r36492', timeout: 10)
    flag = false
    t = Thread.new do
      begin
        sleep
      ensure
        1 until flag
      end
    end

    Thread.pass until t.status == "sleep"

    t.kill
    t.alive? == true
    flag = true
    t.join
_eom
  end

  def test_uninitialized
    c = Class.new(Thread) {def initialize; end}
    assert_raise(ThreadError) { c.new.start }

    bug11959 = '[ruby-core:72732] [Bug #11959]'

    c = Class.new(Thread) {def initialize; exit; end}
    assert_raise(ThreadError, bug11959) { c.new }

    c = Class.new(Thread) {def initialize; raise; end}
    assert_raise(ThreadError, bug11959) { c.new }

    c = Class.new(Thread) {
      def initialize
        pending = pending_interrupt?
        super {pending}
      end
    }
    assert_equal(false, c.new.value, bug11959)
  end

  def test_backtrace
    Thread.new{
      assert_equal(Array, Thread.main.backtrace.class)
    }.join

    t = Thread.new{}
    t.join
    assert_equal(nil, t.backtrace)
  end

  def test_thread_timer_and_interrupt
    bug5757 = '[ruby-dev:44985]'
    pid = nil
    cmd = 'Signal.trap(:INT, "DEFAULT"); r,=IO.pipe; Thread.start {Thread.pass until Thread.main.stop?; puts; STDOUT.flush}; r.read'
    opt = {}
    opt[:new_pgroup] = true if /mswin|mingw/ =~ RUBY_PLATFORM
    s, t, _err = EnvUtil.invoke_ruby(['-e', cmd], "", true, true, opt) do |in_p, out_p, err_p, cpid|
      out_p.gets
      pid = cpid
      t0 = Time.now.to_f
      Process.kill(:SIGINT, pid)
      Process.wait(pid)
      t1 = Time.now.to_f
      [$?, t1 - t0, err_p.read]
    end
    assert_equal(pid, s.pid, bug5757)
    assert_equal([false, true, false, Signal.list["INT"]],
                 [s.exited?, s.signaled?, s.stopped?, s.termsig],
                 "[s.exited?, s.signaled?, s.stopped?, s.termsig]")
    assert_include(0..2, t, bug5757)
  end

  def test_thread_join_in_trap
    assert_separately [], <<-'EOS'
    Signal.trap(:INT, "DEFAULT")
    t0 = Thread.current
    assert_nothing_raised{
      t = Thread.new {Thread.pass until t0.stop?; Process.kill(:INT, $$)}

      Signal.trap :INT do
        t.join
      end

      t.join
    }
    EOS
  end

  def test_thread_value_in_trap
    assert_separately [], <<-'EOS'
    Signal.trap(:INT, "DEFAULT")
    t0 = Thread.current
    t = Thread.new {Thread.pass until t0.stop?; Process.kill(:INT, $$); :normal_end}

    Signal.trap :INT do
      t.value
    end
    assert_equal(:normal_end, t.value)
    EOS
  end

  def test_thread_join_current
    assert_raise(ThreadError) do
      Thread.current.join
    end
  end

  def test_thread_join_main_thread
    Thread.new(Thread.current) {|t|
      assert_raise(ThreadError) do
        t.join
      end
    }.join
  end

  def test_main_thread_status_at_exit
    assert_in_out_err([], <<-'INPUT', ["false false aborting"], [])
q = Thread::Queue.new
Thread.new(Thread.current) {|mth|
  begin
    q.push nil
    mth.run
    Thread.pass until mth.stop?
    p :mth_stopped # don't run if killed by rb_thread_terminate_all
  ensure
    puts "#{mth.alive?} #{mth.status} #{Thread.current.status}"
  end
}
q.pop
    INPUT
  end

  def test_thread_status_in_trap
    # when running trap handler, Thread#status must show "run"
    # Even though interrupted from sleeping function
    assert_in_out_err([], <<-INPUT, %w(sleep run), [])
      Signal.trap(:INT) {
        puts Thread.current.status
        exit
      }
      t = Thread.current

      Thread.new(Thread.current) {|mth|
        Thread.pass until t.stop?
        puts mth.status
        Process.kill(:INT, $$)
      }
      sleep 0.1
    INPUT
  end

  # Bug #7450
  def test_thread_status_raise_after_kill
    ary = []

    t = Thread.new {
      assert_raise(RuntimeError) do
        begin
          ary << Thread.current.status
          sleep #1
        ensure
          begin
            ary << Thread.current.status
            sleep #2
          ensure
            ary << Thread.current.status
          end
        end
      end
    }

    Thread.pass until ary.size >= 1
    Thread.pass until t.stop?
    t.kill  # wake up sleep #1
    Thread.pass until ary.size >= 2
    Thread.pass until t.stop?
    t.raise "wakeup" # wake up sleep #2
    Thread.pass while t.alive?
    assert_equal(ary, ["run", "aborting", "aborting"])
    t.join
  end

  def test_mutex_owned
    mutex = Thread::Mutex.new

    assert_equal(mutex.owned?, false)
    mutex.synchronize {
      # Now, I have the mutex
      assert_equal(mutex.owned?, true)
    }
    assert_equal(mutex.owned?, false)
  end

  def test_mutex_owned2
    begin
      mutex = Thread::Mutex.new
      th = Thread.new {
        # lock forever
        mutex.lock
        sleep
      }

      # acquired by another thread.
      Thread.pass until mutex.locked?
      assert_equal(mutex.owned?, false)
    ensure
      th.kill if th
    end
  end

  def test_mutex_unlock_on_trap
    assert_in_out_err([], <<-INPUT, %w(locked unlocked false), [])
      m = Thread::Mutex.new

      trapped = false
      Signal.trap("INT") { |signo|
        m.unlock
        trapped = true
        puts "unlocked"
      }

      m.lock
      puts "locked"
      Process.kill("INT", $$)
      Thread.pass until trapped
      puts m.locked?
    INPUT
  end

  def invoke_rec script, vm_stack_size, machine_stack_size, use_length = true
    env = {}
    env['RUBY_THREAD_VM_STACK_SIZE'] = vm_stack_size.to_s if vm_stack_size
    env['RUBY_THREAD_MACHINE_STACK_SIZE'] = machine_stack_size.to_s if machine_stack_size
    out, = EnvUtil.invoke_ruby([env, '-e', script], '', true, true)
    use_length ? out.length : out
  end

  def test_stack_size
    h_default = eval(invoke_rec('p RubyVM::DEFAULT_PARAMS', nil, nil, false))
    h_0 = eval(invoke_rec('p RubyVM::DEFAULT_PARAMS', 0, 0, false))
    h_large = eval(invoke_rec('p RubyVM::DEFAULT_PARAMS', 1024 * 1024 * 10, 1024 * 1024 * 10, false))

    assert_operator(h_default[:thread_vm_stack_size], :>, h_0[:thread_vm_stack_size],
                    "0 thread_vm_stack_size")
    assert_operator(h_default[:thread_vm_stack_size], :<, h_large[:thread_vm_stack_size],
                    "large thread_vm_stack_size")
    assert_operator(h_default[:thread_machine_stack_size], :>=, h_0[:thread_machine_stack_size],
                    "0 thread_machine_stack_size")
    assert_operator(h_default[:thread_machine_stack_size], :<=, h_large[:thread_machine_stack_size],
                    "large thread_machine_stack_size")
  end

  def test_vm_machine_stack_size
    script = 'def rec; print "."; STDOUT.flush; rec; end; rec'
    size_default = invoke_rec script, nil, nil
    assert_operator(size_default, :>, 0, "default size")
    size_0 = invoke_rec script, 0, nil
    assert_operator(size_default, :>, size_0, "0 size")
    size_large = invoke_rec script, 1024 * 1024 * 10, nil
    assert_operator(size_default, :<, size_large, "large size")
  end

  def test_machine_stack_size
    # check machine stack size
    # Note that machine stack size may not change size (depend on OSs)
    script = 'def rec; print "."; STDOUT.flush; 1.times{1.times{1.times{rec}}}; end; Thread.new{rec}.join'
    vm_stack_size = 1024 * 1024
    size_default = invoke_rec script, vm_stack_size, nil
    size_0 = invoke_rec script, vm_stack_size, 0
    assert_operator(size_default, :>=, size_0, "0 size")
    size_large = invoke_rec script, vm_stack_size, 1024 * 1024 * 10
    assert_operator(size_default, :<=, size_large, "large size")
  end unless /mswin|mingw/ =~ RUBY_PLATFORM

  def test_blocking_mutex_unlocked_on_fork
    bug8433 = '[ruby-core:55102] [Bug #8433]'

    mutex = Thread::Mutex.new
    flag = false
    mutex.lock

    th = Thread.new do
      mutex.synchronize do
        flag = true
        sleep
      end
    end

    Thread.pass until th.stop?
    mutex.unlock

    pid = Process.fork do
      exit(mutex.locked?)
    end

    th.kill

    pid, status = Process.waitpid2(pid)
    assert_equal(false, status.success?, bug8433)
  end if Process.respond_to?(:fork)

  def test_fork_in_thread
    bug9751 = '[ruby-core:62070] [Bug #9751]'
    f = nil
    th = Thread.start do
      unless f = IO.popen("-")
        STDERR.reopen(STDOUT)
        exit
      end
      Process.wait2(f.pid)
    end
    unless th.join(EnvUtil.apply_timeout_scale(30))
      Process.kill(:QUIT, f.pid)
      Process.kill(:KILL, f.pid) unless th.join(EnvUtil.apply_timeout_scale(1))
    end
    _, status = th.value
    output = f.read
    f.close
    assert_not_predicate(status, :signaled?, FailDesc[status, bug9751, output])
    assert_predicate(status, :success?, bug9751)
  end if Process.respond_to?(:fork)

  def test_subclass_no_initialize
    t = Module.new do
      break eval("class C\u{30b9 30ec 30c3 30c9} < Thread; self; end")
    end
    t.class_eval do
      def initialize
      end
    end
    assert_raise_with_message(ThreadError, /C\u{30b9 30ec 30c3 30c9}/) do
      t.new {}
    end
  end

  def test_thread_name
    t = Thread.start {sleep}
    sleep 0.001 until t.stop?
    assert_nil t.name
    s = t.inspect
    t.name = 'foo'
    assert_equal 'foo', t.name
    t.name = nil
    assert_nil t.name
    assert_equal s, t.inspect
  ensure
    t.kill
    t.join
  end

  def test_thread_invalid_name
    bug11756 = '[ruby-core:71774] [Bug #11756]'
    t = Thread.start {}
    assert_raise(ArgumentError, bug11756) {t.name = "foo\0bar"}
    assert_raise(ArgumentError, bug11756) {t.name = "foo".encode(Encoding::UTF_32BE)}
  ensure
    t.kill
    t.join
  end

  def test_thread_invalid_object
    bug11756 = '[ruby-core:71774] [Bug #11756]'
    t = Thread.start {}
    assert_raise(TypeError, bug11756) {t.name = []}
  ensure
    t.kill
    t.join
  end

  def test_thread_setname_in_initialize
    bug12290 = '[ruby-core:74963] [Bug #12290]'
    c = Class.new(Thread) {def initialize() self.name = "foo"; super; end}
    assert_equal("foo", c.new {Thread.current.name}.value, bug12290)
  end

  def test_thread_interrupt_for_killed_thread
    assert_normal_exit(<<-_end, '[Bug #8996]', timeout: 5, timeout_error: nil)
      Thread.report_on_exception = false
      trap(:TERM){exit}
      while true
        t = Thread.new{sleep 0}
        t.raise Interrupt
      end
    _end
  end

  def test_signal_at_join
    if /mswin|mingw/ =~ RUBY_PLATFORM
      skip "can't trap a signal from another process on Windows"
      # opt = {new_pgroup: true}
    end
    assert_separately([], "#{<<~"{#"}\n#{<<~'};'}")
    {#
      n = 1000
      sig = :INT
      trap(sig) {}
      IO.popen([EnvUtil.rubybin, "-e", "#{<<~"{#1"}\n#{<<~'};#1'}"], "r+") do |f|
        tpid = #{$$}
        sig = :#{sig}
        {#1
          STDOUT.sync = true
          while gets
            puts
            Process.kill(sig, tpid)
          end
        };#1
        assert_nothing_raised do
          n.times do
            w = Thread.start do
              sleep 30
            end
            begin
              f.puts
              f.gets
            ensure
              w.kill
              w.join
            end
          end
        end
        n.times do
          w = Thread.start { sleep 30 }
          begin
            f.puts
            f.gets
          ensure
            w.kill
            t0 = Process.clock_gettime(Process::CLOCK_MONOTONIC)
            w.join(30)
            t1 = Process.clock_gettime(Process::CLOCK_MONOTONIC)
            diff = t1 - t0
            assert_operator diff, :<=, 2
          end
        end
      end
    };
  end
end