Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_queue.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 340053208864
children 6e21215acb1e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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76681a6306a8 Added stub for the Queue module to be renamed in 3.0.
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1 # Some simple queue module tests, plus some failure conditions
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2 # to ensure the Queue locks remain stable.
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3 import Queue
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4 import time
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5 import unittest
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6 from test import test_support
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7 threading = test_support.import_module('threading')
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8
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9 QUEUE_SIZE = 5
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10
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11 # A thread to run a function that unclogs a blocked Queue.
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12 class _TriggerThread(threading.Thread):
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13 def __init__(self, fn, args):
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14 self.fn = fn
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15 self.args = args
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16 self.startedEvent = threading.Event()
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17 threading.Thread.__init__(self)
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18
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19 def run(self):
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20 # The sleep isn't necessary, but is intended to give the blocking
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21 # function in the main thread a chance at actually blocking before
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22 # we unclog it. But if the sleep is longer than the timeout-based
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23 # tests wait in their blocking functions, those tests will fail.
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24 # So we give them much longer timeout values compared to the
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25 # sleep here (I aimed at 10 seconds for blocking functions --
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26 # they should never actually wait that long - they should make
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27 # progress as soon as we call self.fn()).
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28 time.sleep(0.1)
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29 self.startedEvent.set()
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30 self.fn(*self.args)
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31
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32
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33 # Execute a function that blocks, and in a separate thread, a function that
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34 # triggers the release. Returns the result of the blocking function. Caution:
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35 # block_func must guarantee to block until trigger_func is called, and
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36 # trigger_func must guarantee to change queue state so that block_func can make
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37 # enough progress to return. In particular, a block_func that just raises an
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38 # exception regardless of whether trigger_func is called will lead to
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39 # timing-dependent sporadic failures, and one of those went rarely seen but
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40 # undiagnosed for years. Now block_func must be unexceptional. If block_func
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41 # is supposed to raise an exception, call do_exceptional_blocking_test()
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42 # instead.
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43
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44 class BlockingTestMixin:
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45
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46 def do_blocking_test(self, block_func, block_args, trigger_func, trigger_args):
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47 self.t = _TriggerThread(trigger_func, trigger_args)
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48 self.t.start()
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49 self.result = block_func(*block_args)
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50 # If block_func returned before our thread made the call, we failed!
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51 if not self.t.startedEvent.is_set():
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52 self.fail("blocking function '%r' appeared not to block" %
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53 block_func)
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54 self.t.join(10) # make sure the thread terminates
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55 if self.t.is_alive():
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56 self.fail("trigger function '%r' appeared to not return" %
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57 trigger_func)
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58 return self.result
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59
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60 # Call this instead if block_func is supposed to raise an exception.
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61 def do_exceptional_blocking_test(self,block_func, block_args, trigger_func,
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62 trigger_args, expected_exception_class):
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63 self.t = _TriggerThread(trigger_func, trigger_args)
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64 self.t.start()
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65 try:
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66 try:
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67 block_func(*block_args)
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68 except expected_exception_class:
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69 raise
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70 else:
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71 self.fail("expected exception of kind %r" %
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72 expected_exception_class)
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73 finally:
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74 self.t.join(10) # make sure the thread terminates
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75 if self.t.is_alive():
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76 self.fail("trigger function '%r' appeared to not return" %
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77 trigger_func)
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78 if not self.t.startedEvent.is_set():
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79 self.fail("trigger thread ended but event never set")
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80
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81
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82 class BaseQueueTest(BlockingTestMixin):
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83 def setUp(self):
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84 self.cum = 0
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85 self.cumlock = threading.Lock()
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86
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87 def simple_queue_test(self, q):
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88 if not q.empty():
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89 raise RuntimeError, "Call this function with an empty queue"
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90 # I guess we better check things actually queue correctly a little :)
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91 q.put(111)
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92 q.put(333)
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93 q.put(222)
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94 target_order = dict(Queue = [111, 333, 222],
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95 LifoQueue = [222, 333, 111],
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96 PriorityQueue = [111, 222, 333])
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97 actual_order = [q.get(), q.get(), q.get()]
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98 self.assertEqual(actual_order, target_order[q.__class__.__name__],
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99 "Didn't seem to queue the correct data!")
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100 for i in range(QUEUE_SIZE-1):
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101 q.put(i)
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102 self.assertTrue(not q.empty(), "Queue should not be empty")
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103 self.assertTrue(not q.full(), "Queue should not be full")
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104 last = 2 * QUEUE_SIZE
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105 full = 3 * 2 * QUEUE_SIZE
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106 q.put(last)
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107 self.assertTrue(q.full(), "Queue should be full")
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108 try:
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109 q.put(full, block=0)
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110 self.fail("Didn't appear to block with a full queue")
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111 except Queue.Full:
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112 pass
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113 try:
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114 q.put(full, timeout=0.01)
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115 self.fail("Didn't appear to time-out with a full queue")
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116 except Queue.Full:
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117 pass
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118 # Test a blocking put
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119 self.do_blocking_test(q.put, (full,), q.get, ())
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120 self.do_blocking_test(q.put, (full, True, 10), q.get, ())
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121 # Empty it
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122 for i in range(QUEUE_SIZE):
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123 q.get()
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124 self.assertTrue(q.empty(), "Queue should be empty")
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125 try:
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
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126 q.get(block=0)
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127 self.fail("Didn't appear to block with an empty queue")
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128 except Queue.Empty:
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129 pass
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130 try:
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131 q.get(timeout=0.01)
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132 self.fail("Didn't appear to time-out with an empty queue")
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133 except Queue.Empty:
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134 pass
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
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135 # Test a blocking get
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136 self.do_blocking_test(q.get, (), q.put, ('empty',))
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137 self.do_blocking_test(q.get, (True, 10), q.put, ('empty',))
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138
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139
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
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140 def worker(self, q):
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diff changeset
141 while True:
45116
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142 x = q.get()
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diff changeset
143 if x is None:
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144 q.task_done()
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145 return
45121
24969405e1aa Use context manager for a lock.
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diff changeset
146 with self.cumlock:
45116
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147 self.cum += x
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148 q.task_done()
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149
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150 def queue_join_test(self, q):
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151 self.cum = 0
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152 for i in (0,1):
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153 threading.Thread(target=self.worker, args=(q,)).start()
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154 for i in xrange(100):
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155 q.put(i)
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156 q.join()
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157 self.assertEqual(self.cum, sum(range(100)),
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158 "q.join() did not block until all tasks were done")
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159 for i in (0,1):
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160 q.put(None) # instruct the threads to close
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161 q.join() # verify that you can join twice
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162
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163 def test_queue_task_done(self):
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164 # Test to make sure a queue task completed successfully.
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165 q = self.type2test()
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166 try:
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
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diff changeset
167 q.task_done()
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
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168 except ValueError:
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169 pass
33203
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Tim Peters <tim.peters@gmail.com>
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170 else:
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171 self.fail("Did not detect task count going negative")
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172
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173 def test_queue_join(self):
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174 # Test that a queue join()s successfully, and before anything else
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175 # (done twice for insurance).
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176 q = self.type2test()
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177 self.queue_join_test(q)
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178 self.queue_join_test(q)
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179 try:
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
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180 q.task_done()
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181 except ValueError:
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
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182 pass
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
Georg Brandl <georg@python.org>
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183 else:
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184 self.fail("Did not detect task count going negative")
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185
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186 def test_simple_queue(self):
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187 # Do it a couple of times on the same queue.
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188 # Done twice to make sure works with same instance reused.
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189 q = self.type2test(QUEUE_SIZE)
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190 self.simple_queue_test(q)
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191 self.simple_queue_test(q)
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192
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193
75801
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194 class QueueTest(BaseQueueTest, unittest.TestCase):
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195 type2test = Queue.Queue
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196
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197 class LifoQueueTest(BaseQueueTest, unittest.TestCase):
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198 type2test = Queue.LifoQueue
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199
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200 class PriorityQueueTest(BaseQueueTest, unittest.TestCase):
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201 type2test = Queue.PriorityQueue
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202
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203
23160
c548e726b3bc Fix bug 544473 - "Queue module can deadlock".
Mark Hammond <mhammond@skippinet.com.au>
parents:
diff changeset
204
c548e726b3bc Fix bug 544473 - "Queue module can deadlock".
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parents:
diff changeset
205 # A Queue subclass that can provoke failure at a moment's notice :)
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parents:
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206 class FailingQueueException(Exception):
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parents:
diff changeset
207 pass
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parents:
diff changeset
208
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209 class FailingQueue(Queue.Queue):
23160
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parents:
diff changeset
210 def __init__(self, *args):
c548e726b3bc Fix bug 544473 - "Queue module can deadlock".
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parents:
diff changeset
211 self.fail_next_put = False
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parents:
diff changeset
212 self.fail_next_get = False
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213 Queue.Queue.__init__(self, *args)
23160
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parents:
diff changeset
214 def _put(self, item):
c548e726b3bc Fix bug 544473 - "Queue module can deadlock".
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parents:
diff changeset
215 if self.fail_next_put:
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parents:
diff changeset
216 self.fail_next_put = False
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parents:
diff changeset
217 raise FailingQueueException, "You Lose"
47248
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218 return Queue.Queue._put(self, item)
23160
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parents:
diff changeset
219 def _get(self):
c548e726b3bc Fix bug 544473 - "Queue module can deadlock".
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parents:
diff changeset
220 if self.fail_next_get:
c548e726b3bc Fix bug 544473 - "Queue module can deadlock".
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parents:
diff changeset
221 self.fail_next_get = False
c548e726b3bc Fix bug 544473 - "Queue module can deadlock".
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parents:
diff changeset
222 raise FailingQueueException, "You Lose"
47248
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diff changeset
223 return Queue.Queue._get(self)
23160
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Mark Hammond <mhammond@skippinet.com.au>
parents:
diff changeset
224
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225 class FailingQueueTest(unittest.TestCase, BlockingTestMixin):
23160
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parents:
diff changeset
226
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diff changeset
227 def failing_queue_test(self, q):
45205
d39e1a0e0965 Revert accidental changes to test_queue in r60605.
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parents: 45181
diff changeset
228 if not q.empty():
45111
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diff changeset
229 raise RuntimeError, "Call this function with an empty queue"
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diff changeset
230 for i in range(QUEUE_SIZE-1):
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parents: 44714
diff changeset
231 q.put(i)
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parents: 44714
diff changeset
232 # Test a failing non-blocking put.
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diff changeset
233 q.fail_next_put = True
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parents: 44714
diff changeset
234 try:
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
Georg Brandl <georg@python.org>
parents: 44714
diff changeset
235 q.put("oops", block=0)
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Georg Brandl <georg@python.org>
parents: 44714
diff changeset
236 self.fail("The queue didn't fail when it should have")
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
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parents: 44714
diff changeset
237 except FailingQueueException:
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
Georg Brandl <georg@python.org>
parents: 44714
diff changeset
238 pass
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
Georg Brandl <georg@python.org>
parents: 44714
diff changeset
239 q.fail_next_put = True
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
Georg Brandl <georg@python.org>
parents: 44714
diff changeset
240 try:
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
Georg Brandl <georg@python.org>
parents: 44714
diff changeset
241 q.put("oops", timeout=0.1)
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Georg Brandl <georg@python.org>
parents: 44714
diff changeset
242 self.fail("The queue didn't fail when it should have")
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Georg Brandl <georg@python.org>
parents: 44714
diff changeset
243 except FailingQueueException:
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Georg Brandl <georg@python.org>
parents: 44714
diff changeset
244 pass
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
Georg Brandl <georg@python.org>
parents: 44714
diff changeset
245 q.put("last")
55002
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Benjamin Peterson <benjamin@python.org>
parents: 47598
diff changeset
246 self.assertTrue(q.full(), "Queue should be full")
45111
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247 # Test a failing blocking put
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diff changeset
248 q.fail_next_put = True
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Georg Brandl <georg@python.org>
parents: 44714
diff changeset
249 try:
6d75be2c3d3e Rewrite test_queue as unittest. Written for GHOP by Ian Seyer.
Georg Brandl <georg@python.org>
parents: 44714
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250 self.do_blocking_test(q.put, ("full",), q.get, ())
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251 self.fail("The queue didn't fail when it should have")
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252 except FailingQueueException:
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253 pass
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254 # Check the Queue isn't damaged.
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255 # put failed, but get succeeded - re-add
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256 q.put("last")
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257 # Test a failing timeout put
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258 q.fail_next_put = True
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259 try:
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260 self.do_exceptional_blocking_test(q.put, ("full", True, 10), q.get, (),
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261 FailingQueueException)
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262 self.fail("The queue didn't fail when it should have")
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263 except FailingQueueException:
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264 pass
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265 # Check the Queue isn't damaged.
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266 # put failed, but get succeeded - re-add
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267 q.put("last")
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268 self.assertTrue(q.full(), "Queue should be full")
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269 q.get()
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270 self.assertTrue(not q.full(), "Queue should not be full")
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271 q.put("last")
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272 self.assertTrue(q.full(), "Queue should be full")
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273 # Test a blocking put
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274 self.do_blocking_test(q.put, ("full",), q.get, ())
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275 # Empty it
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276 for i in range(QUEUE_SIZE):
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277 q.get()
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278 self.assertTrue(q.empty(), "Queue should be empty")
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279 q.put("first")
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280 q.fail_next_get = True
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281 try:
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282 q.get()
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283 self.fail("The queue didn't fail when it should have")
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284 except FailingQueueException:
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285 pass
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286 self.assertTrue(not q.empty(), "Queue should not be empty")
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287 q.fail_next_get = True
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288 try:
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289 q.get(timeout=0.1)
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290 self.fail("The queue didn't fail when it should have")
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291 except FailingQueueException:
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292 pass
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293 self.assertTrue(not q.empty(), "Queue should not be empty")
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294 q.get()
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295 self.assertTrue(q.empty(), "Queue should be empty")
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296 q.fail_next_get = True
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297 try:
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298 self.do_exceptional_blocking_test(q.get, (), q.put, ('empty',),
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299 FailingQueueException)
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300 self.fail("The queue didn't fail when it should have")
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301 except FailingQueueException:
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302 pass
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303 # put succeeded, but get failed.
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304 self.assertTrue(not q.empty(), "Queue should not be empty")
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305 q.get()
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306 self.assertTrue(q.empty(), "Queue should be empty")
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307
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308 def test_failing_queue(self):
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309 # Test to make sure a queue is functioning correctly.
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310 # Done twice to the same instance.
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311 q = FailingQueue(QUEUE_SIZE)
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312 self.failing_queue_test(q)
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313 self.failing_queue_test(q)
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314
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315
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316 def test_main():
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317 test_support.run_unittest(QueueTest, LifoQueueTest, PriorityQueueTest,
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318 FailingQueueTest)
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Raymond Hettinger <python@rcn.com>
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319
bed3f52f0dc6 SF Patch #1455676: Simplify using Queues with daemon consumer threads
Raymond Hettinger <python@rcn.com>
parents: 33203
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320
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321 if __name__ == "__main__":
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322 test_main()