Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_queue.py @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents d8e9f6f57f13
children aef248c1645a aa0d2d51fbde
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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23214
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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 sys
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5 import threading
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6 import time
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7
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8 from test_support import verify, TestFailed, verbose
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9
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10 queue_size = 5
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11
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12 # Execute a function that blocks, and in a seperate thread, a function that
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13 # triggers the release. Returns the result of the blocking function.
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14 class _TriggerThread(threading.Thread):
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15 def __init__(self, fn, args):
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16 self.fn = fn
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17 self.args = args
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18 self.startedEvent = threading.Event()
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19 threading.Thread.__init__(self)
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20 def run(self):
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21 time.sleep(.1)
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22 self.startedEvent.set()
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23 self.fn(*self.args)
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24
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25 def _doBlockingTest( block_func, block_args, trigger_func, trigger_args):
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26 t = _TriggerThread(trigger_func, trigger_args)
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27 t.start()
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28 try:
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29 return block_func(*block_args)
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30 finally:
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31 # If we unblocked before our thread made the call, we failed!
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32 if not t.startedEvent.isSet():
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33 raise TestFailed("blocking function '%r' appeared not to block" % (block_func,))
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34 t.join(1) # make sure the thread terminates
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35 if t.isAlive():
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36 raise TestFailed("trigger function '%r' appeared to not return" % (trigger_func,))
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37
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38 # A Queue subclass that can provoke failure at a moment's notice :)
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39 class FailingQueueException(Exception):
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40 pass
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41
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42 class FailingQueue(Queue.Queue):
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43 def __init__(self, *args):
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44 self.fail_next_put = False
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45 self.fail_next_get = False
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46 Queue.Queue.__init__(self, *args)
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47 def _put(self, item):
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48 if self.fail_next_put:
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49 self.fail_next_put = False
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50 raise FailingQueueException, "You Lose"
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51 return Queue.Queue._put(self, item)
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52 def _get(self):
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53 if self.fail_next_get:
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54 self.fail_next_get = False
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55 raise FailingQueueException, "You Lose"
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56 return Queue.Queue._get(self)
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57
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58 def FailingQueueTest(q):
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59 if not q.empty():
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60 raise RuntimeError, "Call this function with an empty queue"
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61 for i in range(queue_size-1):
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62 q.put(i)
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63 q.fail_next_put = True
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64 # Test a failing non-blocking put.
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65 try:
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66 q.put("oops", block=0)
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67 raise TestFailed("The queue didn't fail when it should have")
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68 except FailingQueueException:
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69 pass
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70 q.put("last")
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71 verify(q.full(), "Queue should be full")
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72 q.fail_next_put = True
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73 # Test a failing blocking put
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74 try:
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75 _doBlockingTest( q.put, ("full",), q.get, ())
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76 raise TestFailed("The queue didn't fail when it should have")
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77 except FailingQueueException:
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78 pass
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79 # Check the Queue isn't damaged.
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80 # put failed, but get succeeded - re-add
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81 q.put("last")
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82 verify(q.full(), "Queue should be full")
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83 q.get()
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84 verify(not q.full(), "Queue should not be full")
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85 q.put("last")
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86 verify(q.full(), "Queue should be full")
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87 # Test a blocking put
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88 _doBlockingTest( q.put, ("full",), q.get, ())
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89 # Empty it
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90 for i in range(queue_size):
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91 q.get()
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92 verify(q.empty(), "Queue should be empty")
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93 q.put("first")
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94 q.fail_next_get = True
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95 try:
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96 q.get()
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97 raise TestFailed("The queue didn't fail when it should have")
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98 except FailingQueueException:
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99 pass
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100 verify(not q.empty(), "Queue should not be empty")
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101 q.get()
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102 verify(q.empty(), "Queue should be empty")
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103 q.fail_next_get = True
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104 try:
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105 _doBlockingTest( q.get, (), q.put, ('empty',))
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106 raise TestFailed("The queue didn't fail when it should have")
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107 except FailingQueueException:
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108 pass
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109 # put succeeded, but get failed.
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110 verify(not q.empty(), "Queue should not be empty")
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111 q.get()
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112 verify(q.empty(), "Queue should be empty")
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113
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114 def SimpleQueueTest(q):
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115 if not q.empty():
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116 raise RuntimeError, "Call this function with an empty queue"
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117 # I guess we better check things actually queue correctly a little :)
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118 q.put(111)
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119 q.put(222)
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120 verify(q.get()==111 and q.get()==222, "Didn't seem to queue the correct data!")
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121 for i in range(queue_size-1):
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122 q.put(i)
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123 verify(not q.full(), "Queue should not be full")
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124 q.put("last")
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125 verify(q.full(), "Queue should be full")
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126 try:
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127 q.put("full", block=0)
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128 raise TestFailed("Didn't appear to block with a full queue")
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129 except Queue.Full:
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130 pass
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131 # Test a blocking put
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132 _doBlockingTest( q.put, ("full",), q.get, ())
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133 # Empty it
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134 for i in range(queue_size):
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135 q.get()
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136 verify(q.empty(), "Queue should be empty")
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137 try:
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138 q.get(block=0)
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139 raise TestFailed("Didn't appear to block with an empty queue")
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140 except Queue.Empty:
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141 pass
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142 # Test a blocking get
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143 _doBlockingTest( q.get, (), q.put, ('empty',))
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144
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145 def test():
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146 q=Queue.Queue(queue_size)
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147 # Do it a couple of times on the same queue
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148 SimpleQueueTest(q)
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149 SimpleQueueTest(q)
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150 if verbose:
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151 print "Simple Queue tests seemed to work"
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152 q = FailingQueue(queue_size)
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153 FailingQueueTest(q)
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154 FailingQueueTest(q)
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155 if verbose:
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156 print "Failing Queue tests seemed to work"
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157
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158 test()