summaryrefslogtreecommitdiff
path: root/test/ruby/test_fiber.rb
blob: 67fef33b85f567bda6ba5c609f5411b23fa7186e (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
# frozen_string_literal: false
require 'test/unit'
require 'fiber'
EnvUtil.suppress_warning {require 'continuation'}
require 'tmpdir'

class TestFiber < Test::Unit::TestCase
  def test_normal
    assert_equal(:ok2,
      Fiber.new{|e|
        assert_equal(:ok1, e)
        Fiber.yield :ok2
      }.resume(:ok1)
    )
    assert_equal([:a, :b], Fiber.new{|a, b| [a, b]}.resume(:a, :b))
  end

  def test_argument
    assert_equal(4, Fiber.new {|i=4| i}.resume)
  end

  def test_term
    assert_equal(:ok, Fiber.new{:ok}.resume)
    assert_equal([:a, :b, :c, :d, :e],
      Fiber.new{
        Fiber.new{
          Fiber.new{
            Fiber.new{
              [:a]
            }.resume + [:b]
          }.resume + [:c]
        }.resume + [:d]
      }.resume + [:e])
  end

  def test_many_fibers
    skip 'This is unstable on GitHub Actions --jit-wait. TODO: debug it' if defined?(RubyVM::JIT) && RubyVM::JIT.enabled?
    max = 1000
    assert_equal(max, max.times{
      Fiber.new{}
    })
    GC.start # force collect created fibers
    assert_equal(max,
      max.times{|i|
        Fiber.new{
        }.resume
      }
    )
    GC.start # force collect created fibers
  end

  def test_many_fibers_with_threads
    assert_normal_exit <<-SRC, timeout: (/solaris/i =~ RUBY_PLATFORM ? 300 : 60)
      max = 1000
      @cnt = 0
      (1..100).map{|ti|
        Thread.new{
          max.times{|i|
            Fiber.new{
              @cnt += 1
            }.resume
          }
        }
      }.each{|t|
        t.join
      }
    SRC
  end

  def test_error
    assert_raise(ArgumentError){
      Fiber.new # Fiber without block
    }
    f = Fiber.new{}
    Thread.new{
      assert_raise(FiberError){ # Fiber yielding across thread
        f.resume
      }
    }.join
    assert_raise(FiberError){
      f = Fiber.new{}
      f.resume
      f.resume
    }
    assert_raise(RuntimeError){
      Fiber.new{
        @c = callcc{|c| @c = c}
      }.resume
      @c.call # cross fiber callcc
    }
    assert_raise(RuntimeError){
      Fiber.new{
        raise
      }.resume
    }
    assert_raise(FiberError){
      Fiber.yield
    }
    assert_raise(FiberError){
      fib = Fiber.new{
        fib.resume
      }
      fib.resume
    }
    assert_raise(FiberError){
      fib = Fiber.new{
        Fiber.new{
          fib.resume
        }.resume
      }
      fib.resume
    }
    assert_raise(FiberError){
      fib = Fiber.new{}
      fib.raise "raise in unborn fiber"
    }
    assert_raise(FiberError){
      fib = Fiber.new{}
      fib.resume
      fib.raise "raise in dead fiber"
    }
  end

  def test_return
    assert_raise(LocalJumpError){
      Fiber.new do
        return
      end.resume
    }
  end

  def test_throw
    assert_raise(UncaughtThrowError){
      Fiber.new do
        throw :a
      end.resume
    }
  end

  def test_raise
    assert_raise(ZeroDivisionError){
      Fiber.new do
        1/0
      end.resume
    }
    assert_raise(RuntimeError){
      fib = Fiber.new{ Fiber.yield }
      fib.resume
      fib.raise "raise and propagate"
    }
    assert_nothing_raised{
      fib = Fiber.new do
        begin
          Fiber.yield
        rescue
        end
      end
      fib.resume
      fib.raise "rescue in fiber"
    }
    fib = Fiber.new do
      begin
        Fiber.yield
      rescue
        Fiber.yield :ok
      end
    end
    fib.resume
    assert_equal(:ok, fib.raise)
  end

  def test_raise_transferring_fiber
    root = Fiber.current
    fib = Fiber.new { root.transfer }
    fib.transfer
    assert_raise(RuntimeError){
      fib.raise "can raise with transfer: true"
    }
    assert_not_predicate(fib, :alive?)
  end

  def test_transfer
    ary = []
    f2 = nil
    f1 = Fiber.new{
      ary << f2.transfer(:foo)
      :ok
    }
    f2 = Fiber.new{
      ary << f1.transfer(:baz)
      :ng
    }
    assert_equal(:ok, f1.transfer)
    assert_equal([:baz], ary)
  end

  def test_terminate_transferred_fiber
    log = []
    fa1 = fa2 = fb1 = r1 = nil

    fa1 = Fiber.new{
      fa2 = Fiber.new{
        log << :fa2_terminate
      }
      fa2.resume
      log << :fa1_terminate
    }
    fb1 = Fiber.new{
      fa1.transfer
      log << :fb1_terminate
    }

    r1 = Fiber.new{
      fb1.transfer
      log << :r1_terminate
    }

    r1.resume
    log << :root_terminate

    assert_equal [:fa2_terminate, :fa1_terminate, :r1_terminate, :root_terminate], log
  end

  def test_tls
    #
    def tvar(var, val)
      old = Thread.current[var]
      begin
        Thread.current[var] = val
        yield
      ensure
        Thread.current[var] = old
      end
    end

    fb = Fiber.new {
      assert_equal(nil, Thread.current[:v]); tvar(:v, :x) {
      assert_equal(:x,  Thread.current[:v]);   Fiber.yield
      assert_equal(:x,  Thread.current[:v]); }
      assert_equal(nil, Thread.current[:v]); Fiber.yield
      raise # unreachable
    }

    assert_equal(nil, Thread.current[:v]); tvar(:v,1) {
    assert_equal(1,   Thread.current[:v]);   tvar(:v,3) {
    assert_equal(3,   Thread.current[:v]);     fb.resume
    assert_equal(3,   Thread.current[:v]);   }
    assert_equal(1,   Thread.current[:v]); }
    assert_equal(nil, Thread.current[:v]); fb.resume
    assert_equal(nil, Thread.current[:v]);
  end

  def test_alive
    fib = Fiber.new{Fiber.yield}
    assert_equal(true, fib.alive?)
    fib.resume
    assert_equal(true, fib.alive?)
    fib.resume
    assert_equal(false, fib.alive?)
  end

  def test_resume_self
    f = Fiber.new {f.resume}
    assert_raise(FiberError, '[ruby-core:23651]') {f.transfer}
  end

  def test_fiber_transfer_segv
    assert_normal_exit %q{
      require 'fiber'
      f2 = nil
      f1 = Fiber.new{ f2.resume }
      f2 = Fiber.new{ f1.resume }
      f1.transfer
    }, '[ruby-dev:40833]'
    assert_normal_exit %q{
      require 'fiber'
      Fiber.new{}.resume
      1.times{Fiber.current.transfer}
    }
  end

  def test_resume_root_fiber
    Thread.new do
      assert_raise(FiberError) do
        Fiber.current.resume
      end
    end.join
  end

  def test_gc_root_fiber
    bug4612 = '[ruby-core:35891]'

    assert_normal_exit %q{
      require 'fiber'
      GC.stress = true
      Thread.start{ Fiber.current; nil }.join
      GC.start
    }, bug4612
  end

  def test_mark_fiber
    bug13875 = '[ruby-core:82681]'

    assert_normal_exit %q{
      GC.stress = true
      up = 1.upto(10)
      down = 10.downto(1)
      up.zip(down) {|a, b| a + b == 11 or fail 'oops'}
    }, bug13875
  end

  def test_no_valid_cfp
    bug5083 = '[ruby-dev:44208]'
    assert_equal([], Fiber.new(&Module.method(:nesting)).resume, bug5083)
    assert_instance_of(Class, Fiber.new(&Class.new.method(:undef_method)).resume(:to_s), bug5083)
  end

  def test_prohibit_transfer_to_resuming_fiber
    root_fiber = Fiber.current

    assert_raise(FiberError){
      fiber = Fiber.new{ root_fiber.transfer }
      fiber.resume
    }

    fa1 = Fiber.new{
      _fa2 = Fiber.new{ root_fiber.transfer }
    }
    fb1 = Fiber.new{
      _fb2 = Fiber.new{ root_fiber.transfer }
    }
    fa1.transfer
    fb1.transfer

    assert_raise(FiberError){
      fa1.transfer
    }
    assert_raise(FiberError){
      fb1.transfer
    }
  end

  def test_prohibit_transfer_to_yielding_fiber
    f1 = f2 = f3 = nil

    f1 = Fiber.new{
      f2 = Fiber.new{
        f3 = Fiber.new{
          p f3: Fiber.yield
        }
        f3.resume
      }
      f2.resume
    }
    f1.resume

    assert_raise(FiberError){ f3.transfer 10 }
  end

  def test_prohibit_resume_to_transferring_fiber
    root_fiber = Fiber.current

    assert_raise(FiberError){
      Fiber.new{
        root_fiber.resume
      }.transfer
    }

    f1 = f2 = nil
    f1 = Fiber.new do
      f2.transfer
    end
    f2 = Fiber.new do
      f1.resume # attempt to resume transferring fiber
    end

    assert_raise(FiberError){
      f1.transfer
    }
  end


  def test_fork_from_fiber
    skip 'fork not supported' unless Process.respond_to?(:fork)
    pid = nil
    bug5700 = '[ruby-core:41456]'
    assert_nothing_raised(bug5700) do
      Fiber.new do
        pid = fork do
          xpid = nil
          Fiber.new {
            xpid = fork do
              # enough to trigger GC on old root fiber
              count = 1000
              count.times do
                Fiber.new {}.transfer
                Fiber.new { Fiber.yield }
              end
              exit!(0)
            end
          }.transfer
          _, status = Process.waitpid2(xpid)
          exit!(status.success?)
        end
      end.resume
    end
    pid, status = Process.waitpid2(pid)
    assert_equal(0, status.exitstatus, bug5700)
    assert_equal(false, status.signaled?, bug5700)
  end

  def test_exit_in_fiber
    bug5993 = '[ruby-dev:45218]'
    assert_nothing_raised(bug5993) do
      Thread.new{ Fiber.new{ Thread.exit }.resume; raise "unreachable" }.join
    end
  end

  def test_fatal_in_fiber
    assert_in_out_err(["-r-test-/fatal/rb_fatal", "-e", <<-EOS], "", [], /ok/)
      Fiber.new{
        Bug.rb_fatal "ok"
      }.resume
      puts :ng # unreachable.
    EOS
  end

  def test_separate_lastmatch
    bug7678 = '[ruby-core:51331]'
    /a/ =~ "a"
    m1 = $~
    m2 = nil
    Fiber.new do
      /b/ =~ "b"
      m2 = $~
    end.resume
    assert_equal("b", m2[0])
    assert_equal(m1, $~, bug7678)
  end

  def test_separate_lastline
    bug7678 = '[ruby-core:51331]'
    $_ = s1 = "outer"
    s2 = nil
    Fiber.new do
      s2 = "inner"
    end.resume
    assert_equal("inner", s2)
    assert_equal(s1, $_, bug7678)
  end

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

  def test_to_s
    f = Fiber.new do
      assert_match(/resumed/, f.to_s)
      Fiber.yield
    end
    assert_match(/created/, f.to_s)
    f.resume
    assert_match(/suspended/, f.to_s)
    f.resume
    assert_match(/terminated/, f.to_s)
    assert_match(/resumed/, Fiber.current.to_s)
  end

  def test_create_fiber_in_new_thread
    ret = Thread.new{
      Thread.new{
        Fiber.new{Fiber.yield :ok}.resume
      }.value
    }.value
    assert_equal :ok, ret, '[Bug #14642]'
  end

  def test_machine_stack_gc
    assert_normal_exit <<-RUBY, '[Bug #14561]', timeout: 10
      enum = Enumerator.new { |y| y << 1 }
      thread = Thread.new { enum.peek }
      thread.join
      sleep 5     # pause until thread cache wait time runs out. Native thread exits.
      GC.start
    RUBY
  end
end