Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_thread.py @ 58765:2ba7677bfa95 legacy-trunk

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testCopysign was defined twice in test_math; combine the definitions
author Mark Dickinson <dickinsm@gmail.com>
date Sat, 06 Feb 2010 23:11:25 +0000
parents cd360ac58cd2
children 4afc50d15544
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 import os
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2 import unittest
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3 import random
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4 from test import test_support
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5 import thread
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6 import time
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7 import weakref
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8
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9 from test import lock_tests
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10
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11 NUMTASKS = 10
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12 NUMTRIPS = 3
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13
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14
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15 _print_mutex = thread.allocate_lock()
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16
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17 def verbose_print(arg):
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18 """Helper function for printing out debugging output."""
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19 if test_support.verbose:
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20 with _print_mutex:
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21 print arg
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22
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23
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24 class BasicThreadTest(unittest.TestCase):
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25
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26 def setUp(self):
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27 self.done_mutex = thread.allocate_lock()
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28 self.done_mutex.acquire()
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29 self.running_mutex = thread.allocate_lock()
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30 self.random_mutex = thread.allocate_lock()
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31 self.created = 0
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32 self.running = 0
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33 self.next_ident = 0
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34
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35
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36 class ThreadRunningTests(BasicThreadTest):
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37
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38 def newtask(self):
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39 with self.running_mutex:
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40 self.next_ident += 1
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41 verbose_print("creating task %s" % self.next_ident)
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42 thread.start_new_thread(self.task, (self.next_ident,))
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43 self.created += 1
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44 self.running += 1
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45
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46 def task(self, ident):
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47 with self.random_mutex:
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48 delay = random.random() / 10000.0
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49 verbose_print("task %s will run for %sus" % (ident, round(delay*1e6)))
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50 time.sleep(delay)
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51 verbose_print("task %s done" % ident)
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52 with self.running_mutex:
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53 self.running -= 1
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54 if self.created == NUMTASKS and self.running == 0:
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55 self.done_mutex.release()
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56
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57 def test_starting_threads(self):
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58 # Basic test for thread creation.
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59 for i in range(NUMTASKS):
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60 self.newtask()
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61 verbose_print("waiting for tasks to complete...")
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62 self.done_mutex.acquire()
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63 verbose_print("all tasks done")
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64
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65 def test_stack_size(self):
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66 # Various stack size tests.
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67 self.assertEquals(thread.stack_size(), 0, "intial stack size is not 0")
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68
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69 thread.stack_size(0)
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70 self.assertEquals(thread.stack_size(), 0, "stack_size not reset to default")
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71
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72 if os.name not in ("nt", "os2", "posix"):
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73 return
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74
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75 tss_supported = True
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76 try:
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77 thread.stack_size(4096)
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78 except ValueError:
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79 verbose_print("caught expected ValueError setting "
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80 "stack_size(4096)")
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81 except thread.error:
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82 tss_supported = False
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83 verbose_print("platform does not support changing thread stack "
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84 "size")
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85
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86 if tss_supported:
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87 fail_msg = "stack_size(%d) failed - should succeed"
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88 for tss in (262144, 0x100000, 0):
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89 thread.stack_size(tss)
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90 self.assertEquals(thread.stack_size(), tss, fail_msg % tss)
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91 verbose_print("successfully set stack_size(%d)" % tss)
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92
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93 for tss in (262144, 0x100000):
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94 verbose_print("trying stack_size = (%d)" % tss)
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95 self.next_ident = 0
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96 self.created = 0
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97 for i in range(NUMTASKS):
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98 self.newtask()
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99
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100 verbose_print("waiting for all tasks to complete")
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101 self.done_mutex.acquire()
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102 verbose_print("all tasks done")
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103
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104 thread.stack_size(0)
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105
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106 def test__count(self):
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107 # Test the _count() function.
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108 orig = thread._count()
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109 mut = thread.allocate_lock()
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110 mut.acquire()
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111 started = []
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112 def task():
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113 started.append(None)
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114 mut.acquire()
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115 mut.release()
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116 thread.start_new_thread(task, ())
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117 while not started:
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118 time.sleep(0.01)
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119 self.assertEquals(thread._count(), orig + 1)
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120 # Allow the task to finish.
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121 mut.release()
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122 # The only reliable way to be sure that the thread ended from the
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123 # interpreter's point of view is to wait for the function object to be
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124 # destroyed.
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125 done = []
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126 wr = weakref.ref(task, lambda _: done.append(None))
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127 del task
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128 while not done:
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129 time.sleep(0.01)
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130 self.assertEquals(thread._count(), orig)
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131
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132
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133 class Barrier:
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134 def __init__(self, num_threads):
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135 self.num_threads = num_threads
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136 self.waiting = 0
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137 self.checkin_mutex = thread.allocate_lock()
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138 self.checkout_mutex = thread.allocate_lock()
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139 self.checkout_mutex.acquire()
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140
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141 def enter(self):
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142 self.checkin_mutex.acquire()
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143 self.waiting = self.waiting + 1
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144 if self.waiting == self.num_threads:
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145 self.waiting = self.num_threads - 1
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146 self.checkout_mutex.release()
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147 return
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148 self.checkin_mutex.release()
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149
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150 self.checkout_mutex.acquire()
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151 self.waiting = self.waiting - 1
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152 if self.waiting == 0:
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153 self.checkin_mutex.release()
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154 return
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155 self.checkout_mutex.release()
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156
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157
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158 class BarrierTest(BasicThreadTest):
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159
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160 def test_barrier(self):
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161 self.bar = Barrier(NUMTASKS)
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162 self.running = NUMTASKS
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163 for i in range(NUMTASKS):
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164 thread.start_new_thread(self.task2, (i,))
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165 verbose_print("waiting for tasks to end")
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166 self.done_mutex.acquire()
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167 verbose_print("tasks done")
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168
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169 def task2(self, ident):
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170 for i in range(NUMTRIPS):
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171 if ident == 0:
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172 # give it a good chance to enter the next
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173 # barrier before the others are all out
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174 # of the current one
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175 delay = 0
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176 else:
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177 with self.random_mutex:
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178 delay = random.random() / 10000.0
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179 verbose_print("task %s will run for %sus" %
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180 (ident, round(delay * 1e6)))
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181 time.sleep(delay)
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182 verbose_print("task %s entering %s" % (ident, i))
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183 self.bar.enter()
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184 verbose_print("task %s leaving barrier" % ident)
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185 with self.running_mutex:
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186 self.running -= 1
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187 # Must release mutex before releasing done, else the main thread can
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188 # exit and set mutex to None as part of global teardown; then
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189 # mutex.release() raises AttributeError.
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190 finished = self.running == 0
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191 if finished:
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192 self.done_mutex.release()
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193
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194
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195 class LockTests(lock_tests.LockTests):
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196 locktype = thread.allocate_lock
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197
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198
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199 def test_main():
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200 test_support.run_unittest(ThreadRunningTests, BarrierTest, LockTests)
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201
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202 if __name__ == "__main__":
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203 test_main()