Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_thread.py @ 70817:dd775b1561ba

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Fix markup.
author Georg Brandl <georg@python.org>
date Tue, 14 Jun 2011 21:09:55 +0200
parents 3c9232a684ae
children 60ad83716733
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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 support
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5 thread = support.import_module('_thread')
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6 import time
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7 import sys
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8 import weakref
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9
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10 from test import lock_tests
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12 NUMTASKS = 10
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13 NUMTRIPS = 3
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15 _print_mutex = thread.allocate_lock()
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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 support.verbose:
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20 with _print_mutex:
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21 print(arg)
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23 class BasicThreadTest(unittest.TestCase):
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25 def setUp(self):
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26 self.done_mutex = thread.allocate_lock()
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27 self.done_mutex.acquire()
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28 self.running_mutex = thread.allocate_lock()
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29 self.random_mutex = thread.allocate_lock()
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30 self.created = 0
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31 self.running = 0
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32 self.next_ident = 0
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34
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35 class ThreadRunningTests(BasicThreadTest):
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36
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37 def newtask(self):
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38 with self.running_mutex:
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39 self.next_ident += 1
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40 verbose_print("creating task %s" % self.next_ident)
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41 thread.start_new_thread(self.task, (self.next_ident,))
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42 self.created += 1
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43 self.running += 1
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45 def task(self, ident):
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46 with self.random_mutex:
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47 delay = random.random() / 10000.0
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48 verbose_print("task %s will run for %sus" % (ident, round(delay*1e6)))
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49 time.sleep(delay)
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50 verbose_print("task %s done" % ident)
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51 with self.running_mutex:
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52 self.running -= 1
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53 if self.created == NUMTASKS and self.running == 0:
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54 self.done_mutex.release()
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56 def test_starting_threads(self):
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57 # Basic test for thread creation.
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58 for i in range(NUMTASKS):
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59 self.newtask()
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60 verbose_print("waiting for tasks to complete...")
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61 self.done_mutex.acquire()
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62 verbose_print("all tasks done")
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63
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64 def test_stack_size(self):
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65 # Various stack size tests.
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66 self.assertEqual(thread.stack_size(), 0, "initial stack size is not 0")
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67
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68 thread.stack_size(0)
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69 self.assertEqual(thread.stack_size(), 0, "stack_size not reset to default")
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70
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71 if os.name not in ("nt", "os2", "posix"):
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72 return
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73
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74 tss_supported = True
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75 try:
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76 thread.stack_size(4096)
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77 except ValueError:
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78 verbose_print("caught expected ValueError setting "
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79 "stack_size(4096)")
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80 except thread.error:
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81 tss_supported = False
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82 verbose_print("platform does not support changing thread stack "
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83 "size")
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84
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85 if tss_supported:
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86 fail_msg = "stack_size(%d) failed - should succeed"
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87 for tss in (262144, 0x100000, 0):
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88 thread.stack_size(tss)
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89 self.assertEqual(thread.stack_size(), tss, fail_msg % tss)
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90 verbose_print("successfully set stack_size(%d)" % tss)
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91
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92 for tss in (262144, 0x100000):
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93 verbose_print("trying stack_size = (%d)" % tss)
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94 self.next_ident = 0
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95 self.created = 0
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96 for i in range(NUMTASKS):
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97 self.newtask()
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98
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99 verbose_print("waiting for all tasks to complete")
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100 self.done_mutex.acquire()
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101 verbose_print("all tasks done")
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102
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103 thread.stack_size(0)
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104
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105 def test__count(self):
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106 # Test the _count() function.
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107 orig = thread._count()
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108 mut = thread.allocate_lock()
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109 mut.acquire()
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110 started = []
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111 def task():
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112 started.append(None)
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113 mut.acquire()
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114 mut.release()
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115 thread.start_new_thread(task, ())
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116 while not started:
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117 time.sleep(0.01)
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118 self.assertEqual(thread._count(), orig + 1)
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119 # Allow the task to finish.
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120 mut.release()
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121 # The only reliable way to be sure that the thread ended from the
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122 # interpreter's point of view is to wait for the function object to be
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123 # destroyed.
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124 done = []
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125 wr = weakref.ref(task, lambda _: done.append(None))
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126 del task
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127 while not done:
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128 time.sleep(0.01)
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129 self.assertEqual(thread._count(), orig)
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130
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131
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132 class Barrier:
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133 def __init__(self, num_threads):
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134 self.num_threads = num_threads
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135 self.waiting = 0
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136 self.checkin_mutex = thread.allocate_lock()
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137 self.checkout_mutex = thread.allocate_lock()
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138 self.checkout_mutex.acquire()
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139
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140 def enter(self):
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141 self.checkin_mutex.acquire()
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142 self.waiting = self.waiting + 1
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143 if self.waiting == self.num_threads:
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144 self.waiting = self.num_threads - 1
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145 self.checkout_mutex.release()
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146 return
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147 self.checkin_mutex.release()
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148
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149 self.checkout_mutex.acquire()
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150 self.waiting = self.waiting - 1
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151 if self.waiting == 0:
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152 self.checkin_mutex.release()
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153 return
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154 self.checkout_mutex.release()
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155
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156
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157 class BarrierTest(BasicThreadTest):
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158
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159 def test_barrier(self):
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160 self.bar = Barrier(NUMTASKS)
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161 self.running = NUMTASKS
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162 for i in range(NUMTASKS):
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163 thread.start_new_thread(self.task2, (i,))
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164 verbose_print("waiting for tasks to end")
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165 self.done_mutex.acquire()
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166 verbose_print("tasks done")
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167
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168 def task2(self, ident):
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169 for i in range(NUMTRIPS):
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170 if ident == 0:
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171 # give it a good chance to enter the next
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172 # barrier before the others are all out
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173 # of the current one
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174 delay = 0
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175 else:
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176 with self.random_mutex:
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177 delay = random.random() / 10000.0
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178 verbose_print("task %s will run for %sus" %
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179 (ident, round(delay * 1e6)))
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180 time.sleep(delay)
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181 verbose_print("task %s entering %s" % (ident, i))
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182 self.bar.enter()
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183 verbose_print("task %s leaving barrier" % ident)
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184 with self.running_mutex:
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185 self.running -= 1
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186 # Must release mutex before releasing done, else the main thread can
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187 # exit and set mutex to None as part of global teardown; then
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188 # mutex.release() raises AttributeError.
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189 finished = self.running == 0
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190 if finished:
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191 self.done_mutex.release()
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192
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193 class LockTests(lock_tests.LockTests):
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194 locktype = thread.allocate_lock
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195
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196
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197 class TestForkInThread(unittest.TestCase):
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198 def setUp(self):
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199 self.read_fd, self.write_fd = os.pipe()
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200
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201 @unittest.skipIf(sys.platform.startswith('win'),
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202 "This test is only appropriate for POSIX-like systems.")
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203 @support.reap_threads
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204 def test_forkinthread(self):
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205 def thread1():
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206 try:
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207 pid = os.fork() # fork in a thread
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208 except RuntimeError:
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209 os._exit(1) # exit the child
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210
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211 if pid == 0: # child
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212 try:
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213 os.close(self.read_fd)
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214 os.write(self.write_fd, b"OK")
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215 finally:
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216 os._exit(0)
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217 else: # parent
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218 os.close(self.write_fd)
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219
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220 thread.start_new_thread(thread1, ())
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221 self.assertEqual(os.read(self.read_fd, 2), b"OK",
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222 "Unable to fork() in thread")
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223
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224 def tearDown(self):
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225 try:
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226 os.close(self.read_fd)
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227 except OSError:
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228 pass
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229
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230 try:
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231 os.close(self.write_fd)
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232 except OSError:
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233 pass
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234
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235
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236 def test_main():
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237 support.run_unittest(ThreadRunningTests, BarrierTest, LockTests,
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238 TestForkInThread)
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239
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240 if __name__ == "__main__":
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241 test_main()