Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_thread.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 3182453e74f9
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 thread = test_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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11
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12 NUMTASKS = 10
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13 NUMTRIPS = 3
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14
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15
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16 _print_mutex = thread.allocate_lock()
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17
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18 def verbose_print(arg):
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19 """Helper function for printing out debugging output."""
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20 if test_support.verbose:
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21 with _print_mutex:
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22 print arg
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23
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24
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25 class BasicThreadTest(unittest.TestCase):
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26
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27 def setUp(self):
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28 self.done_mutex = thread.allocate_lock()
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29 self.done_mutex.acquire()
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30 self.running_mutex = thread.allocate_lock()
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31 self.random_mutex = thread.allocate_lock()
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32 self.created = 0
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33 self.running = 0
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34 self.next_ident = 0
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35
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36
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37 class ThreadRunningTests(BasicThreadTest):
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38
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39 def newtask(self):
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40 with self.running_mutex:
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41 self.next_ident += 1
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42 verbose_print("creating task %s" % self.next_ident)
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43 thread.start_new_thread(self.task, (self.next_ident,))
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44 self.created += 1
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45 self.running += 1
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46
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47 def task(self, ident):
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48 with self.random_mutex:
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49 delay = random.random() / 10000.0
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50 verbose_print("task %s will run for %sus" % (ident, round(delay*1e6)))
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51 time.sleep(delay)
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52 verbose_print("task %s done" % ident)
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53 with self.running_mutex:
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54 self.running -= 1
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55 if self.created == NUMTASKS and self.running == 0:
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56 self.done_mutex.release()
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57
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58 def test_starting_threads(self):
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59 # Basic test for thread creation.
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60 for i in range(NUMTASKS):
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61 self.newtask()
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62 verbose_print("waiting for tasks to complete...")
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63 self.done_mutex.acquire()
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64 verbose_print("all tasks done")
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65
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66 def test_stack_size(self):
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67 # Various stack size tests.
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68 self.assertEqual(thread.stack_size(), 0, "initial stack size is not 0")
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69
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70 thread.stack_size(0)
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71 self.assertEqual(thread.stack_size(), 0, "stack_size not reset to default")
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72
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73 if os.name not in ("nt", "os2", "posix"):
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74 return
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75
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76 tss_supported = True
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77 try:
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78 thread.stack_size(4096)
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79 except ValueError:
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80 verbose_print("caught expected ValueError setting "
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81 "stack_size(4096)")
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82 except thread.error:
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83 tss_supported = False
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84 verbose_print("platform does not support changing thread stack "
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85 "size")
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86
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87 if tss_supported:
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88 fail_msg = "stack_size(%d) failed - should succeed"
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89 for tss in (262144, 0x100000, 0):
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90 thread.stack_size(tss)
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91 self.assertEqual(thread.stack_size(), tss, fail_msg % tss)
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92 verbose_print("successfully set stack_size(%d)" % tss)
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93
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94 for tss in (262144, 0x100000):
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95 verbose_print("trying stack_size = (%d)" % tss)
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96 self.next_ident = 0
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97 self.created = 0
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98 for i in range(NUMTASKS):
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99 self.newtask()
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100
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101 verbose_print("waiting for all tasks to complete")
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102 self.done_mutex.acquire()
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103 verbose_print("all tasks done")
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104
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105 thread.stack_size(0)
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106
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107 def test__count(self):
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108 # Test the _count() function.
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109 orig = thread._count()
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110 mut = thread.allocate_lock()
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111 mut.acquire()
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112 started = []
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113 def task():
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114 started.append(None)
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115 mut.acquire()
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116 mut.release()
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117 thread.start_new_thread(task, ())
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118 while not started:
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119 time.sleep(0.01)
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120 self.assertEqual(thread._count(), orig + 1)
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121 # Allow the task to finish.
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122 mut.release()
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123 # The only reliable way to be sure that the thread ended from the
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124 # interpreter's point of view is to wait for the function object to be
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125 # destroyed.
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126 done = []
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127 wr = weakref.ref(task, lambda _: done.append(None))
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diff changeset
128 del task
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diff changeset
129 while not done:
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diff changeset
130 time.sleep(0.01)
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13ff85b10db0 #8178 Cleanup the threads after test_thread.TestForkInThread.
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diff changeset
131 self.assertEqual(thread._count(), orig)
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132
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133 def test_save_exception_state_on_error(self):
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134 # See issue #14474
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135 def task():
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136 started.release()
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137 raise SyntaxError
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138 def mywrite(self, *args):
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139 try:
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140 raise ValueError
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141 except ValueError:
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parents: 68256
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142 pass
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143 real_write(self, *args)
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144 c = thread._count()
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145 started = thread.allocate_lock()
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146 with test_support.captured_output("stderr") as stderr:
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147 real_write = stderr.write
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148 stderr.write = mywrite
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149 started.acquire()
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150 thread.start_new_thread(task, ())
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151 started.acquire()
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152 while thread._count() > c:
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153 time.sleep(0.01)
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154 self.assertIn("Traceback", stderr.getvalue())
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155
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156
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157 class Barrier:
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158 def __init__(self, num_threads):
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159 self.num_threads = num_threads
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160 self.waiting = 0
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161 self.checkin_mutex = thread.allocate_lock()
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162 self.checkout_mutex = thread.allocate_lock()
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163 self.checkout_mutex.acquire()
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164
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165 def enter(self):
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166 self.checkin_mutex.acquire()
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167 self.waiting = self.waiting + 1
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diff changeset
168 if self.waiting == self.num_threads:
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169 self.waiting = self.num_threads - 1
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170 self.checkout_mutex.release()
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171 return
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172 self.checkin_mutex.release()
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173
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diff changeset
174 self.checkout_mutex.acquire()
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175 self.waiting = self.waiting - 1
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176 if self.waiting == 0:
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177 self.checkin_mutex.release()
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178 return
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179 self.checkout_mutex.release()
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180
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181
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182 class BarrierTest(BasicThreadTest):
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183
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184 def test_barrier(self):
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185 self.bar = Barrier(NUMTASKS)
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186 self.running = NUMTASKS
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187 for i in range(NUMTASKS):
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diff changeset
188 thread.start_new_thread(self.task2, (i,))
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diff changeset
189 verbose_print("waiting for tasks to end")
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190 self.done_mutex.acquire()
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191 verbose_print("tasks done")
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192
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193 def task2(self, ident):
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diff changeset
194 for i in range(NUMTRIPS):
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diff changeset
195 if ident == 0:
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diff changeset
196 # give it a good chance to enter the next
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197 # barrier before the others are all out
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198 # of the current one
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Jeffrey Yasskin <jyasskin@gmail.com>
parents: 45749
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199 delay = 0
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200 else:
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diff changeset
201 with self.random_mutex:
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202 delay = random.random() / 10000.0
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diff changeset
203 verbose_print("task %s will run for %sus" %
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parents: 45749
diff changeset
204 (ident, round(delay * 1e6)))
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6a33d4f6f16f Move test_thread over to unittest. Commits GHOP 237.
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diff changeset
205 time.sleep(delay)
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parents: 38802
diff changeset
206 verbose_print("task %s entering %s" % (ident, i))
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parents: 38802
diff changeset
207 self.bar.enter()
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parents: 38802
diff changeset
208 verbose_print("task %s leaving barrier" % ident)
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diff changeset
209 with self.running_mutex:
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parents: 38802
diff changeset
210 self.running -= 1
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parents: 38802
diff changeset
211 # Must release mutex before releasing done, else the main thread can
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parents: 38802
diff changeset
212 # exit and set mutex to None as part of global teardown; then
6a33d4f6f16f Move test_thread over to unittest. Commits GHOP 237.
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parents: 38802
diff changeset
213 # mutex.release() raises AttributeError.
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parents: 38802
diff changeset
214 finished = self.running == 0
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parents: 38802
diff changeset
215 if finished:
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parents: 38802
diff changeset
216 self.done_mutex.release()
38794
f7d23bca599f Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 38592
diff changeset
217
f7d23bca599f Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 38592
diff changeset
218
57159
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diff changeset
219 class LockTests(lock_tests.LockTests):
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diff changeset
220 locktype = thread.allocate_lock
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221
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diff changeset
222
59226
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diff changeset
223 class TestForkInThread(unittest.TestCase):
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224 def setUp(self):
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diff changeset
225 self.read_fd, self.write_fd = os.pipe()
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226
59233
46ae164b15ba Fix test to be skipped on windows.
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parents: 59210
diff changeset
227 @unittest.skipIf(sys.platform.startswith('win'),
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13ff85b10db0 #8178 Cleanup the threads after test_thread.TestForkInThread.
Florent Xicluna <florent.xicluna@gmail.com>
parents: 59233
diff changeset
228 "This test is only appropriate for POSIX-like systems.")
13ff85b10db0 #8178 Cleanup the threads after test_thread.TestForkInThread.
Florent Xicluna <florent.xicluna@gmail.com>
parents: 59233
diff changeset
229 @test_support.reap_threads
59210
4afc50d15544 Issue #7242: On Solaris 9 and earlier calling os.fork() from within a
Gregory P. Smith <greg@mad-scientist.com>
parents: 57129
diff changeset
230 def test_forkinthread(self):
59226
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diff changeset
231 def thread1():
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diff changeset
232 try:
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diff changeset
233 pid = os.fork() # fork in a thread
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diff changeset
234 except RuntimeError:
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diff changeset
235 sys.exit(0) # exit the child
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diff changeset
236
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diff changeset
237 if pid == 0: # child
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diff changeset
238 os.close(self.read_fd)
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diff changeset
239 os.write(self.write_fd, "OK")
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diff changeset
240 sys.exit(0)
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diff changeset
241 else: # parent
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diff changeset
242 os.close(self.write_fd)
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diff changeset
243
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diff changeset
244 thread.start_new_thread(thread1, ())
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diff changeset
245 self.assertEqual(os.read(self.read_fd, 2), "OK",
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diff changeset
246 "Unable to fork() in thread")
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diff changeset
247
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diff changeset
248 def tearDown(self):
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diff changeset
249 try:
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250 os.close(self.read_fd)
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diff changeset
251 except OSError:
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252 pass
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diff changeset
253
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diff changeset
254 try:
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diff changeset
255 os.close(self.write_fd)
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256 except OSError:
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257 pass
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258
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259
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260 def test_main():
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261 test_support.run_unittest(ThreadRunningTests, BarrierTest, LockTests,
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262 TestForkInThread)
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263
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264 if __name__ == "__main__":
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265 test_main()