summaryrefslogtreecommitdiff
path: root/test/monitor/test_monitor.rb
blob: 8854b59ccc8b6367ff7b08bff969cf6ca259291b (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
# frozen_string_literal: false
require "monitor"

require "test/unit"

class TestMonitor < Test::Unit::TestCase
  Queue = Thread::Queue

  def setup
    @monitor = Monitor.new
  end

  def test_enter
    ary = []
    queue = Queue.new
    th = Thread.start {
      queue.pop
      @monitor.enter
      for i in 6 .. 10
        ary.push(i)
        Thread.pass
      end
      @monitor.exit
    }
    th2 = Thread.start {
      @monitor.enter
      queue.enq(nil)
      for i in 1 .. 5
        ary.push(i)
        Thread.pass
      end
      @monitor.exit
    }
    assert_join_threads([th, th2])
    assert_equal((1..10).to_a, ary)
  end

  def test_enter_second_after_killed_thread
    th = Thread.start {
      @monitor.enter
      Thread.current.kill
      @monitor.exit
    }
    th.join
    @monitor.enter
    @monitor.exit
    th2 = Thread.start {
      @monitor.enter
      @monitor.exit
    }
    assert_join_threads([th, th2])
  end

  def test_synchronize
    ary = []
    queue = Queue.new
    th = Thread.start {
      queue.pop
      @monitor.synchronize do
        for i in 6 .. 10
          ary.push(i)
          Thread.pass
        end
      end
    }
    th2 = Thread.start {
      @monitor.synchronize do
        queue.enq(nil)
        for i in 1 .. 5
          ary.push(i)
          Thread.pass
        end
      end
    }
    assert_join_threads([th, th2])
    assert_equal((1..10).to_a, ary)
  end

  def test_killed_thread_in_synchronize
    ary = []
    queue = Queue.new
    t1 = Thread.start {
      queue.pop
      @monitor.synchronize {
        ary << :t1
      }
    }
    t2 = Thread.start {
      queue.pop
      @monitor.synchronize {
        ary << :t2
      }
    }
    t3 = Thread.start {
      @monitor.synchronize do
        queue.enq(nil)
        queue.enq(nil)
        assert_equal([], ary)
        t1.kill
        t2.kill
        ary << :main
      end
      assert_equal([:main], ary)
    }
    assert_join_threads([t1, t2, t3])
  end

  def test_try_enter
    queue1 = Queue.new
    queue2 = Queue.new
    th = Thread.start {
      queue1.deq
      @monitor.enter
      queue2.enq(nil)
      queue1.deq
      @monitor.exit
      queue2.enq(nil)
    }
    th2 = Thread.start {
      assert_equal(true, @monitor.try_enter)
      @monitor.exit
      queue1.enq(nil)
      queue2.deq
      assert_equal(false, @monitor.try_enter)
      queue1.enq(nil)
      queue2.deq
      assert_equal(true, @monitor.try_enter)
    }
    assert_join_threads([th, th2])
  end

  def test_try_enter_second_after_killed_thread
    th = Thread.start {
      assert_equal(true, @monitor.try_enter)
      Thread.current.kill
      @monitor.exit
    }
    th.join
    assert_equal(true, @monitor.try_enter)
    @monitor.exit
    th2 = Thread.start {
      assert_equal(true, @monitor.try_enter)
      @monitor.exit
    }
    assert_join_threads([th, th2])
  end

  def test_mon_locked_and_owned
    queue1 = Queue.new
    queue2 = Queue.new
    th = Thread.start {
      @monitor.enter
      queue1.enq(nil)
      queue2.deq
      @monitor.exit
      queue1.enq(nil)
    }
    queue1.deq
    assert(@monitor.mon_locked?)
    assert(!@monitor.mon_owned?)

    queue2.enq(nil)
    queue1.deq
    assert(!@monitor.mon_locked?)

    @monitor.enter
    assert @monitor.mon_locked?
    assert @monitor.mon_owned?
    @monitor.exit

    @monitor.synchronize do
      assert @monitor.mon_locked?
      assert @monitor.mon_owned?
    end
  end

  def test_cond
    cond = @monitor.new_cond

    a = "foo"
    queue1 = Queue.new
    th = Thread.start do
      queue1.deq
      @monitor.synchronize do
        a = "bar"
        cond.signal
      end
    end
    th2 = Thread.start do
      @monitor.synchronize do
        queue1.enq(nil)
        assert_equal("foo", a)
        result1 = cond.wait
        assert_equal(true, result1)
        assert_equal("bar", a)
      end
    end
    assert_join_threads([th, th2])
  end

  def test_timedwait
    cond = @monitor.new_cond
    b = "foo"
    queue2 = Queue.new
    th = Thread.start do
      queue2.deq
      @monitor.synchronize do
        b = "bar"
        cond.signal
      end
    end
    th2 = Thread.start do
      @monitor.synchronize do
        queue2.enq(nil)
        assert_equal("foo", b)
        result2 = cond.wait(0.1)
        assert_equal(true, result2)
        assert_equal("bar", b)
      end
    end
    assert_join_threads([th, th2])

    c = "foo"
    queue3 = Queue.new
    th = Thread.start do
      queue3.deq
      @monitor.synchronize do
        c = "bar"
        cond.signal
      end
    end
    th2 = Thread.start do
      @monitor.synchronize do
        assert_equal("foo", c)
        result3 = cond.wait(0.1)
        assert_equal(true, result3) # wait always returns true in Ruby 1.9
        assert_equal("foo", c)
        queue3.enq(nil)
        result4 = cond.wait
        assert_equal(true, result4)
        assert_equal("bar", c)
      end
    end
    assert_join_threads([th, th2])

#     d = "foo"
#     cumber_thread = Thread.start {
#       loop do
#         @monitor.synchronize do
#           d = "foo"
#         end
#       end
#     }
#     queue3 = Queue.new
#     Thread.start do
#       queue3.pop
#       @monitor.synchronize do
#         d = "bar"
#         cond.signal
#       end
#     end
#     @monitor.synchronize do
#       queue3.enq(nil)
#       assert_equal("foo", d)
#       result5 = cond.wait
#       assert_equal(true, result5)
#       # this thread has priority over cumber_thread
#       assert_equal("bar", d)
#     end
#     cumber_thread.kill
  end

  def test_wait_interruption
    queue = Queue.new
    cond = @monitor.new_cond
    @monitor.define_singleton_method(:mon_enter_for_cond) do |*args|
      queue.deq
      super(*args)
    end
    th = Thread.start {
      @monitor.synchronize do
        begin
          cond.wait(0.1)
        rescue Interrupt
          @monitor.instance_variable_get(:@mon_owner)
        end
      end
    }
    sleep(0.1)
    th.raise(Interrupt)
    queue.enq(nil)
    assert_equal th, th.value
  end
end