annotate Lib/threading.py @ 64166:d0e9febfa00a 3.1

Merged revisions 84172 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r84172 | martin.v.loewis | 2010-08-18 18:12:23 +0200 (Mi, 18 Aug 2010) | 2 lines Restore GIL in nis_cat in case of error. ........
author Martin v. Löwis <martin@v.loewis.de>
date Thu, 19 Aug 2010 09:03:03 +0000
parents c10024abd118
children c70aa011c059
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ca58f5a4558b Docstring nits: The module is neither proposed nor new.
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1 """Thread module emulating a subset of Java's threading model."""
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2
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3 import sys as _sys
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4 import _thread
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5
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6 from time import time as _time, sleep as _sleep
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7 from traceback import format_exc as _format_exc
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8 from collections import deque
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9
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10 # Note regarding PEP 8 compliant names
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11 # This threading model was originally inspired by Java, and inherited
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12 # the convention of camelCase function and method names from that
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13 # language. Those originaly names are not in any imminent danger of
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14 # being deprecated (even for Py3k),so this module provides them as an
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15 # alias for the PEP 8 compliant names
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16 # Note that using the new PEP 8 compliant names facilitates substitution
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17 # with the multiprocessing module, which doesn't provide the old
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18 # Java inspired names.
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19
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20
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21 # Rename some stuff so "from threading import *" is safe
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22 __all__ = ['active_count', 'Condition', 'current_thread', 'enumerate', 'Event',
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23 'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Thread',
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24 'Timer', 'setprofile', 'settrace', 'local', 'stack_size']
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25
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26 _start_new_thread = _thread.start_new_thread
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27 _allocate_lock = _thread.allocate_lock
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28 _get_ident = _thread.get_ident
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29 ThreadError = _thread.error
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30 del _thread
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32
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33 # Debug support (adapted from ihooks.py).
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34 # All the major classes here derive from _Verbose. We force that to
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35 # be a new-style class so that all the major classes here are new-style.
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36 # This helps debugging (type(instance) is more revealing for instances
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37 # of new-style classes).
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38
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39 _VERBOSE = False
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41 if __debug__:
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42
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43 class _Verbose(object):
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45 def __init__(self, verbose=None):
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46 if verbose is None:
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47 verbose = _VERBOSE
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48 self._verbose = verbose
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50 def _note(self, format, *args):
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51 if self._verbose:
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52 format = format % args
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53 format = "%s: %s\n" % (
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54 current_thread().name, format)
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55 _sys.stderr.write(format)
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56
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57 else:
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58 # Disable this when using "python -O"
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59 class _Verbose(object):
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60 def __init__(self, verbose=None):
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61 pass
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62 def _note(self, *args):
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63 pass
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64
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65 # Support for profile and trace hooks
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66
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67 _profile_hook = None
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68 _trace_hook = None
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69
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70 def setprofile(func):
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71 global _profile_hook
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72 _profile_hook = func
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73
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74 def settrace(func):
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75 global _trace_hook
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76 _trace_hook = func
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77
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78 # Synchronization classes
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79
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80 Lock = _allocate_lock
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81
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82 def RLock(*args, **kwargs):
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83 return _RLock(*args, **kwargs)
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84
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85 class _RLock(_Verbose):
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86
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87 def __init__(self, verbose=None):
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88 _Verbose.__init__(self, verbose)
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89 self._block = _allocate_lock()
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90 self._owner = None
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91 self._count = 0
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92
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93 def __repr__(self):
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94 owner = self._owner
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95 try:
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96 owner = _active[owner].name
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97 except KeyError:
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98 pass
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99 return "<%s owner=%r count=%d>" % (
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100 self.__class__.__name__, owner, self._count)
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101
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102 def acquire(self, blocking=True):
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103 me = _get_ident()
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104 if self._owner == me:
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105 self._count = self._count + 1
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106 if __debug__:
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107 self._note("%s.acquire(%s): recursive success", self, blocking)
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108 return 1
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109 rc = self._block.acquire(blocking)
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110 if rc:
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111 self._owner = me
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112 self._count = 1
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113 if __debug__:
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114 self._note("%s.acquire(%s): initial success", self, blocking)
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115 else:
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116 if __debug__:
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117 self._note("%s.acquire(%s): failure", self, blocking)
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118 return rc
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119
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120 __enter__ = acquire
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121
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122 def release(self):
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123 if self._owner != _get_ident():
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124 raise RuntimeError("cannot release un-acquired lock")
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125 self._count = count = self._count - 1
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126 if not count:
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127 self._owner = None
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128 self._block.release()
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129 if __debug__:
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130 self._note("%s.release(): final release", self)
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131 else:
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132 if __debug__:
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133 self._note("%s.release(): non-final release", self)
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134
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135 def __exit__(self, t, v, tb):
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136 self.release()
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137
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138 # Internal methods used by condition variables
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139
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140 def _acquire_restore(self, state):
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141 self._block.acquire()
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142 self._count, self._owner = state
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143 if __debug__:
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144 self._note("%s._acquire_restore()", self)
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145
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146 def _release_save(self):
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147 if __debug__:
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148 self._note("%s._release_save()", self)
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149 count = self._count
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150 self._count = 0
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151 owner = self._owner
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152 self._owner = None
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153 self._block.release()
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154 return (count, owner)
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155
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156 def _is_owned(self):
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157 return self._owner == _get_ident()
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158
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159
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160 def Condition(*args, **kwargs):
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161 return _Condition(*args, **kwargs)
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162
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163 class _Condition(_Verbose):
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164
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165 def __init__(self, lock=None, verbose=None):
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166 _Verbose.__init__(self, verbose)
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167 if lock is None:
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168 lock = RLock()
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169 self._lock = lock
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170 # Export the lock's acquire() and release() methods
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171 self.acquire = lock.acquire
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172 self.release = lock.release
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173 # If the lock defines _release_save() and/or _acquire_restore(),
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174 # these override the default implementations (which just call
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175 # release() and acquire() on the lock). Ditto for _is_owned().
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176 try:
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177 self._release_save = lock._release_save
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178 except AttributeError:
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179 pass
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180 try:
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181 self._acquire_restore = lock._acquire_restore
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182 except AttributeError:
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183 pass
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184 try:
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185 self._is_owned = lock._is_owned
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186 except AttributeError:
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187 pass
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188 self._waiters = []
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189
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190 def __enter__(self):
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191 return self._lock.__enter__()
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192
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193 def __exit__(self, *args):
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194 return self._lock.__exit__(*args)
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195
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196 def __repr__(self):
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197 return "<Condition(%s, %d)>" % (self._lock, len(self._waiters))
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198
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199 def _release_save(self):
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200 self._lock.release() # No state to save
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201
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202 def _acquire_restore(self, x):
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203 self._lock.acquire() # Ignore saved state
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204
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205 def _is_owned(self):
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206 # Return True if lock is owned by current_thread.
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207 # This method is called only if __lock doesn't have _is_owned().
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208 if self._lock.acquire(0):
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209 self._lock.release()
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210 return False
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211 else:
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212 return True
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213
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214 def wait(self, timeout=None):
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215 if not self._is_owned():
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216 raise RuntimeError("cannot wait on un-acquired lock")
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217 waiter = _allocate_lock()
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218 waiter.acquire()
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219 self._waiters.append(waiter)
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220 saved_state = self._release_save()
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221 try: # restore state no matter what (e.g., KeyboardInterrupt)
836cdf8d1245 SF bug [#410708] Condition.wait() and KeyboardInterrupt.
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222 if timeout is None:
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223 waiter.acquire()
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224 if __debug__:
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225 self._note("%s.wait(): got it", self)
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226 else:
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227 # Balancing act: We can't afford a pure busy loop, so we
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228 # have to sleep; but if we sleep the whole timeout time,
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229 # we'll be unresponsive. The scheme here sleeps very
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230 # little at first, longer as time goes on, but never longer
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231 # than 20 times per second (or the timeout time remaining).
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232 endtime = _time() + timeout
19184
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233 delay = 0.0005 # 500 us -> initial delay of 1 ms
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234 while True:
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235 gotit = waiter.acquire(0)
19184
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236 if gotit:
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237 break
19184
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238 remaining = endtime - _time()
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239 if remaining <= 0:
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240 break
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241 delay = min(delay * 2, remaining, .05)
17303
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242 _sleep(delay)
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243 if not gotit:
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244 if __debug__:
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245 self._note("%s.wait(%s): timed out", self, timeout)
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246 try:
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247 self._waiters.remove(waiter)
17303
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248 except ValueError:
836cdf8d1245 SF bug [#410708] Condition.wait() and KeyboardInterrupt.
Tim Peters <tim.peters@gmail.com>
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diff changeset
249 pass
836cdf8d1245 SF bug [#410708] Condition.wait() and KeyboardInterrupt.
Tim Peters <tim.peters@gmail.com>
parents: 15873
diff changeset
250 else:
836cdf8d1245 SF bug [#410708] Condition.wait() and KeyboardInterrupt.
Tim Peters <tim.peters@gmail.com>
parents: 15873
diff changeset
251 if __debug__:
836cdf8d1245 SF bug [#410708] Condition.wait() and KeyboardInterrupt.
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diff changeset
252 self._note("%s.wait(%s): got it", self, timeout)
836cdf8d1245 SF bug [#410708] Condition.wait() and KeyboardInterrupt.
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diff changeset
253 finally:
836cdf8d1245 SF bug [#410708] Condition.wait() and KeyboardInterrupt.
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254 self._acquire_restore(saved_state)
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255
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256 def notify(self, n=1):
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257 if not self._is_owned():
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258 raise RuntimeError("cannot notify on un-acquired lock")
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259 __waiters = self._waiters
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260 waiters = __waiters[:n]
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261 if not waiters:
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262 if __debug__:
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263 self._note("%s.notify(): no waiters", self)
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264 return
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265 self._note("%s.notify(): notifying %d waiter%s", self, n,
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266 n!=1 and "s" or "")
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267 for waiter in waiters:
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268 waiter.release()
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269 try:
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270 __waiters.remove(waiter)
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271 except ValueError:
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272 pass
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273
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274 def notify_all(self):
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275 self.notify(len(self._waiters))
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276
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277 notifyAll = notify_all
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278
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279
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280 def Semaphore(*args, **kwargs):
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281 return _Semaphore(*args, **kwargs)
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282
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283 class _Semaphore(_Verbose):
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284
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285 # After Tim Peters' semaphore class, but not quite the same (no maximum)
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286
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287 def __init__(self, value=1, verbose=None):
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288 if value < 0:
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289 raise ValueError("semaphore initial value must be >= 0")
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290 _Verbose.__init__(self, verbose)
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291 self._cond = Condition(Lock())
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292 self._value = value
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293
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294 def acquire(self, blocking=True):
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295 rc = False
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296 self._cond.acquire()
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297 while self._value == 0:
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298 if not blocking:
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299 break
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300 if __debug__:
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301 self._note("%s.acquire(%s): blocked waiting, value=%s",
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302 self, blocking, self._value)
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303 self._cond.wait()
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304 else:
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305 self._value = self._value - 1
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306 if __debug__:
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307 self._note("%s.acquire: success, value=%s",
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308 self, self._value)
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309 rc = True
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310 self._cond.release()
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311 return rc
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312
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313 __enter__ = acquire
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314
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315 def release(self):
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316 self._cond.acquire()
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317 self._value = self._value + 1
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318 if __debug__:
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319 self._note("%s.release: success, value=%s",
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320 self, self._value)
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321 self._cond.notify()
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322 self._cond.release()
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323
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324 def __exit__(self, t, v, tb):
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325 self.release()
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326
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327
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328 def BoundedSemaphore(*args, **kwargs):
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329 return _BoundedSemaphore(*args, **kwargs)
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330
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331 class _BoundedSemaphore(_Semaphore):
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332 """Semaphore that checks that # releases is <= # acquires"""
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333 def __init__(self, value=1, verbose=None):
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334 _Semaphore.__init__(self, value, verbose)
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335 self._initial_value = value
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336
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337 def release(self):
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338 if self._value >= self._initial_value:
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339 raise ValueError("Semaphore released too many times")
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340 return _Semaphore.release(self)
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341
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342
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343 def Event(*args, **kwargs):
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344 return _Event(*args, **kwargs)
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345
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346 class _Event(_Verbose):
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347
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348 # After Tim Peters' event class (without is_posted())
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349
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350 def __init__(self, verbose=None):
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351 _Verbose.__init__(self, verbose)
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352 self._cond = Condition(Lock())
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353 self._flag = False
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354
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355 def is_set(self):
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356 return self._flag
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357
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358 isSet = is_set
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359
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360 def set(self):
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361 self._cond.acquire()
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362 try:
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363 self._flag = True
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364 self._cond.notify_all()
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365 finally:
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366 self._cond.release()
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367
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368 def clear(self):
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369 self._cond.acquire()
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370 try:
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371 self._flag = False
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372 finally:
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373 self._cond.release()
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374
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375 def wait(self, timeout=None):
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376 self._cond.acquire()
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377 try:
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378 if not self._flag:
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379 self._cond.wait(timeout)
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380 return self._flag
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381 finally:
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382 self._cond.release()
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383
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384 # Helper to generate new thread names
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385 _counter = 0
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386 def _newname(template="Thread-%d"):
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387 global _counter
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388 _counter = _counter + 1
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389 return template % _counter
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390
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391 # Active thread administration
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392 _active_limbo_lock = _allocate_lock()
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393 _active = {} # maps thread id to Thread object
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394 _limbo = {}
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395
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396
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397 # Main class for threads
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398
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399 class Thread(_Verbose):
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400
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401 __initialized = False
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402 # Need to store a reference to sys.exc_info for printing
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403 # out exceptions when a thread tries to use a global var. during interp.
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404 # shutdown and thus raises an exception about trying to perform some
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Brett Cannon <bcannon@gmail.com>
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405 # operation on/with a NoneType
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406 __exc_info = _sys.exc_info
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407 # Keep sys.exc_clear too to clear the exception just before
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408 # allowing .join() to return.
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409 #XXX __exc_clear = _sys.exc_clear
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410
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411 def __init__(self, group=None, target=None, name=None,
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412 args=(), kwargs=None, verbose=None):
8474
049aa3a8a172 Get rid of tabnanny's last complaints.
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parents: 8454
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413 assert group is None, "group argument must be None for now"
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414 _Verbose.__init__(self, verbose)
35236
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Georg Brandl <georg@python.org>
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diff changeset
415 if kwargs is None:
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416 kwargs = {}
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417 self._target = target
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418 self._name = str(name or _newname())
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419 self._args = args
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420 self._kwargs = kwargs
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421 self._daemonic = self._set_daemon()
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422 self._ident = None
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423 self._started = Event()
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424 self._stopped = False
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425 self._block = Condition(Lock())
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426 self._initialized = True
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427 # sys.stderr is not stored in the class like
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parents: 31629
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428 # sys.exc_info since it can be changed between instances
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429 self._stderr = _sys.stderr
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430
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parents:
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431 def _set_daemon(self):
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parents:
diff changeset
432 # Overridden in _MainThread and _DummyThread
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2614d501de9a change is_daemon, set_daemon, get_name, and set_name to properties
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parents: 48743
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433 return current_thread().daemon
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434
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Guido van Rossum <guido@python.org>
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435 def __repr__(self):
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436 assert self._initialized, "Thread.__init__() was not called"
7949
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437 status = "initial"
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438 if self._started.is_set():
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439 status = "started"
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440 if self._stopped:
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441 status = "stopped"
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442 if self._daemonic:
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Georg Brandl <georg@python.org>
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443 status += " daemon"
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444 if self._ident is not None:
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445 status += " %s" % self._ident
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parents: 42678
diff changeset
446 return "<%s(%s, %s)>" % (self.__class__.__name__, self._name, status)
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parents:
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447
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
448 def start(self):
42679
e71c3223810f Get rid of all __private variables and methods in the threading module.
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parents: 42678
diff changeset
449 if not self._initialized:
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diff changeset
450 raise RuntimeError("thread.__init__() not called")
45549
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Christian Heimes <christian@cheimes.de>
parents: 45495
diff changeset
451
47615
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Benjamin Peterson <benjamin@python.org>
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diff changeset
452 if self._started.is_set():
60379
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Senthil Kumaran <orsenthil@gmail.com>
parents: 59203
diff changeset
453 raise RuntimeError("threads can only be started once")
7949
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Guido van Rossum <guido@python.org>
parents:
diff changeset
454 if __debug__:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
455 self._note("%s.start(): starting thread", self)
52892
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Benjamin Peterson <benjamin@python.org>
parents: 49058
diff changeset
456 with _active_limbo_lock:
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Benjamin Peterson <benjamin@python.org>
parents: 49058
diff changeset
457 _limbo[self] = self
59203
9e8113e76adb Merged revisions 78519 via svnmerge from
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parents: 57160
diff changeset
458 try:
9e8113e76adb Merged revisions 78519 via svnmerge from
Gregory P. Smith <greg@mad-scientist.com>
parents: 57160
diff changeset
459 _start_new_thread(self._bootstrap, ())
9e8113e76adb Merged revisions 78519 via svnmerge from
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parents: 57160
diff changeset
460 except Exception:
9e8113e76adb Merged revisions 78519 via svnmerge from
Gregory P. Smith <greg@mad-scientist.com>
parents: 57160
diff changeset
461 with _active_limbo_lock:
9e8113e76adb Merged revisions 78519 via svnmerge from
Gregory P. Smith <greg@mad-scientist.com>
parents: 57160
diff changeset
462 del _limbo[self]
9e8113e76adb Merged revisions 78519 via svnmerge from
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parents: 57160
diff changeset
463 raise
45549
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Christian Heimes <christian@cheimes.de>
parents: 45495
diff changeset
464 self._started.wait()
7949
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Guido van Rossum <guido@python.org>
parents:
diff changeset
465
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
466 def run(self):
45495
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Christian Heimes <christian@cheimes.de>
parents: 44943
diff changeset
467 try:
48488fa50729 Merged revisions 61003-61033 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 44943
diff changeset
468 if self._target:
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Christian Heimes <christian@cheimes.de>
parents: 44943
diff changeset
469 self._target(*self._args, **self._kwargs)
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Christian Heimes <christian@cheimes.de>
parents: 44943
diff changeset
470 finally:
48488fa50729 Merged revisions 61003-61033 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 44943
diff changeset
471 # Avoid a refcycle if the thread is running a function with
48488fa50729 Merged revisions 61003-61033 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 44943
diff changeset
472 # an argument that has a member that points to the thread.
48488fa50729 Merged revisions 61003-61033 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 44943
diff changeset
473 del self._target, self._args, self._kwargs
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parents:
diff changeset
474
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diff changeset
475 def _bootstrap(self):
42678
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Guido van Rossum <guido@python.org>
parents: 42466
diff changeset
476 # Wrapper around the real bootstrap code that ignores
af6a7190cabc Merged revisions 57152-57220 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42466
diff changeset
477 # exceptions during interpreter cleanup. Those typically
af6a7190cabc Merged revisions 57152-57220 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42466
diff changeset
478 # happen when a daemon thread wakes up at an unfortunate
af6a7190cabc Merged revisions 57152-57220 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42466
diff changeset
479 # moment, finds the world around it destroyed, and raises some
af6a7190cabc Merged revisions 57152-57220 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42466
diff changeset
480 # random exception *** while trying to report the exception in
45549
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parents: 45495
diff changeset
481 # _bootstrap_inner() below ***. Those random exceptions
42678
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Guido van Rossum <guido@python.org>
parents: 42466
diff changeset
482 # don't help anybody, and they confuse users, so we suppress
af6a7190cabc Merged revisions 57152-57220 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42466
diff changeset
483 # them. We suppress them only when it appears that the world
af6a7190cabc Merged revisions 57152-57220 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42466
diff changeset
484 # indeed has already been destroyed, so that exceptions in
45549
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Christian Heimes <christian@cheimes.de>
parents: 45495
diff changeset
485 # _bootstrap_inner() during normal business hours are properly
42678
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Guido van Rossum <guido@python.org>
parents: 42466
diff changeset
486 # reported. Also, we only suppress them for daemonic threads;
af6a7190cabc Merged revisions 57152-57220 via svnmerge from
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parents: 42466
diff changeset
487 # if a non-daemonic encounters this, something else is wrong.
af6a7190cabc Merged revisions 57152-57220 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42466
diff changeset
488 try:
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parents: 42678
diff changeset
489 self._bootstrap_inner()
42678
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parents: 42466
diff changeset
490 except:
42679
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parents: 42678
diff changeset
491 if self._daemonic and _sys is None:
42678
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Guido van Rossum <guido@python.org>
parents: 42466
diff changeset
492 return
af6a7190cabc Merged revisions 57152-57220 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42466
diff changeset
493 raise
af6a7190cabc Merged revisions 57152-57220 via svnmerge from
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parents: 42466
diff changeset
494
52892
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Benjamin Peterson <benjamin@python.org>
parents: 49058
diff changeset
495 def _set_ident(self):
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parents: 49058
diff changeset
496 self._ident = _get_ident()
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Benjamin Peterson <benjamin@python.org>
parents: 49058
diff changeset
497
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diff changeset
498 def _bootstrap_inner(self):
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Guido van Rossum <guido@python.org>
parents:
diff changeset
499 try:
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parents: 49058
diff changeset
500 self._set_ident()
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parents: 45495
diff changeset
501 self._started.set()
52892
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Benjamin Peterson <benjamin@python.org>
parents: 49058
diff changeset
502 with _active_limbo_lock:
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Benjamin Peterson <benjamin@python.org>
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diff changeset
503 _active[self._ident] = self
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Benjamin Peterson <benjamin@python.org>
parents: 49058
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504 del _limbo[self]
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parents:
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505 if __debug__:
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Christian Heimes <christian@cheimes.de>
parents: 45495
diff changeset
506 self._note("%s._bootstrap(): thread started", self)
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Jeremy Hylton <jeremy@alum.mit.edu>
parents: 29676
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507
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Jeremy Hylton <jeremy@alum.mit.edu>
parents: 29676
diff changeset
508 if _trace_hook:
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Christian Heimes <christian@cheimes.de>
parents: 45495
diff changeset
509 self._note("%s._bootstrap(): registering trace hook", self)
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Jeremy Hylton <jeremy@alum.mit.edu>
parents: 29676
diff changeset
510 _sys.settrace(_trace_hook)
d0f15977f37f Add settrace() and setprofile() functions to the threading library.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 29676
diff changeset
511 if _profile_hook:
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Christian Heimes <christian@cheimes.de>
parents: 45495
diff changeset
512 self._note("%s._bootstrap(): registering profile hook", self)
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Jeremy Hylton <jeremy@alum.mit.edu>
parents: 29676
diff changeset
513 _sys.setprofile(_profile_hook)
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Tim Peters <tim.peters@gmail.com>
parents: 29683
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514
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515 try:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
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parents:
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516 self.run()
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parents:
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517 except SystemExit:
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parents:
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518 if __debug__:
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Christian Heimes <christian@cheimes.de>
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519 self._note("%s._bootstrap(): raised SystemExit", self)
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parents:
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520 except:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
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parents:
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521 if __debug__:
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Christian Heimes <christian@cheimes.de>
parents: 45495
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522 self._note("%s._bootstrap(): unhandled exception", self)
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Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
523 # If sys.stderr is no more (most likely from interpreter
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parents: 42678
diff changeset
524 # shutdown) use self._stderr. Otherwise still use sys (as in
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Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
525 # _sys) in case sys.stderr was redefined since the creation of
796ccb9082ef threading.Thread objects will now print a traceback for an exception raised
Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
526 # self.
796ccb9082ef threading.Thread objects will now print a traceback for an exception raised
Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
527 if _sys:
796ccb9082ef threading.Thread objects will now print a traceback for an exception raised
Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
528 _sys.stderr.write("Exception in thread %s:\n%s\n" %
48745
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Benjamin Peterson <benjamin@python.org>
parents: 48743
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529 (self.name, _format_exc()))
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Brett Cannon <bcannon@gmail.com>
parents: 31629
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530 else:
796ccb9082ef threading.Thread objects will now print a traceback for an exception raised
Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
531 # Do the best job possible w/o a huge amt. of code to
796ccb9082ef threading.Thread objects will now print a traceback for an exception raised
Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
532 # approximate a traceback (code ideas from
796ccb9082ef threading.Thread objects will now print a traceback for an exception raised
Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
533 # Lib/traceback.py)
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Guido van Rossum <guido@python.org>
parents: 42678
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534 exc_type, exc_value, exc_tb = self._exc_info()
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Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
535 try:
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4cdf21a0dbbc Fix most trivially-findable print statements.
Guido van Rossum <guido@python.org>
parents: 40582
diff changeset
536 print((
48745
2614d501de9a change is_daemon, set_daemon, get_name, and set_name to properties
Benjamin Peterson <benjamin@python.org>
parents: 48743
diff changeset
537 "Exception in thread " + self.name +
42679
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Guido van Rossum <guido@python.org>
parents: 42678
diff changeset
538 " (most likely raised during interpreter shutdown):"), file=self._stderr)
40775
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Guido van Rossum <guido@python.org>
parents: 40582
diff changeset
539 print((
42679
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Guido van Rossum <guido@python.org>
parents: 42678
diff changeset
540 "Traceback (most recent call last):"), file=self._stderr)
32475
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Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
541 while exc_tb:
40775
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Guido van Rossum <guido@python.org>
parents: 40582
diff changeset
542 print((
32475
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Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
543 ' File "%s", line %s, in %s' %
796ccb9082ef threading.Thread objects will now print a traceback for an exception raised
Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
544 (exc_tb.tb_frame.f_code.co_filename,
796ccb9082ef threading.Thread objects will now print a traceback for an exception raised
Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
545 exc_tb.tb_lineno,
42679
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Guido van Rossum <guido@python.org>
parents: 42678
diff changeset
546 exc_tb.tb_frame.f_code.co_name)), file=self._stderr)
32475
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Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
547 exc_tb = exc_tb.tb_next
42679
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Guido van Rossum <guido@python.org>
parents: 42678
diff changeset
548 print(("%s: %s" % (exc_type, exc_value)), file=self._stderr)
32475
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Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
549 # Make sure that exc_tb gets deleted since it is a memory
796ccb9082ef threading.Thread objects will now print a traceback for an exception raised
Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
550 # hog; deleting everything else is just for thoroughness
796ccb9082ef threading.Thread objects will now print a traceback for an exception raised
Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
551 finally:
796ccb9082ef threading.Thread objects will now print a traceback for an exception raised
Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
552 del exc_type, exc_value, exc_tb
7949
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Guido van Rossum <guido@python.org>
parents:
diff changeset
553 else:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
554 if __debug__:
45549
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Christian Heimes <christian@cheimes.de>
parents: 45495
diff changeset
555 self._note("%s._bootstrap(): normal return", self)
46161
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Christian Heimes <christian@cheimes.de>
parents: 45549
diff changeset
556 finally:
848160d10780 Merged revisions 61981,61984-61987,61992-61993,61997-62000 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 45549
diff changeset
557 # Prevent a race in
848160d10780 Merged revisions 61981,61984-61987,61992-61993,61997-62000 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 45549
diff changeset
558 # test_threading.test_no_refcycle_through_target when
848160d10780 Merged revisions 61981,61984-61987,61992-61993,61997-62000 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 45549
diff changeset
559 # the exception keeps the target alive past when we
848160d10780 Merged revisions 61981,61984-61987,61992-61993,61997-62000 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 45549
diff changeset
560 # assert that it's dead.
848160d10780 Merged revisions 61981,61984-61987,61992-61993,61997-62000 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 45549
diff changeset
561 #XXX self.__exc_clear()
848160d10780 Merged revisions 61981,61984-61987,61992-61993,61997-62000 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 45549
diff changeset
562 pass
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
563 finally:
44885
fefaa0e66fdd Merged revisions 60176-60209 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 43020
diff changeset
564 with _active_limbo_lock:
fefaa0e66fdd Merged revisions 60176-60209 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 43020
diff changeset
565 self._stop()
fefaa0e66fdd Merged revisions 60176-60209 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 43020
diff changeset
566 try:
47555
7d824fd131ad Merged revisions 63829-63831,63858,63865,63879,63882,63948,63970-63972,63976,63989,64014-64015,64021-64022,64063-64065,64067 via svnmerge from
Georg Brandl <georg@python.org>
parents: 47266
diff changeset
567 # We don't call self._delete() because it also
44885
fefaa0e66fdd Merged revisions 60176-60209 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 43020
diff changeset
568 # grabs _active_limbo_lock.
fefaa0e66fdd Merged revisions 60176-60209 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 43020
diff changeset
569 del _active[_get_ident()]
fefaa0e66fdd Merged revisions 60176-60209 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 43020
diff changeset
570 except:
fefaa0e66fdd Merged revisions 60176-60209 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 43020
diff changeset
571 pass
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58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
572
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e71c3223810f Get rid of all __private variables and methods in the threading module.
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parents: 42678
diff changeset
573 def _stop(self):
44943
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Christian Heimes <christian@cheimes.de>
parents: 44885
diff changeset
574 self._block.acquire()
6547be11f443 Merged revisions 60245-60277 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 44885
diff changeset
575 self._stopped = True
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Benjamin Peterson <benjamin@python.org>
parents: 47555
diff changeset
576 self._block.notify_all()
44943
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Christian Heimes <christian@cheimes.de>
parents: 44885
diff changeset
577 self._block.release()
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58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
578
42679
e71c3223810f Get rid of all __private variables and methods in the threading module.
Guido van Rossum <guido@python.org>
parents: 42678
diff changeset
579 def _delete(self):
32778
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
580 "Remove current thread from the dict of currently running threads."
32774
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Brett Cannon <bcannon@gmail.com>
parents: 32673
diff changeset
581
47266
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Georg Brandl <georg@python.org>
parents: 46304
diff changeset
582 # Notes about running with _dummy_thread:
32778
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
583 #
47266
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Georg Brandl <georg@python.org>
parents: 46304
diff changeset
584 # Must take care to not raise an exception if _dummy_thread is being
32778
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
585 # used (and thus this module is being used as an instance of
47266
7fe3a8648ce2 Rename thread to _thread and dummy_thread to _dummy_thread. Issue #2875.
Georg Brandl <georg@python.org>
parents: 46304
diff changeset
586 # dummy_threading). _dummy_thread.get_ident() always returns -1 since
7fe3a8648ce2 Rename thread to _thread and dummy_thread to _dummy_thread. Issue #2875.
Georg Brandl <georg@python.org>
parents: 46304
diff changeset
587 # there is only one thread if _dummy_thread is being used. Thus
32778
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
588 # len(_active) is always <= 1 here, and any Thread instance created
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
589 # overwrites the (if any) thread currently registered in _active.
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
590 #
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
591 # An instance of _MainThread is always created by 'threading'. This
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
592 # gets overwritten the instant an instance of Thread is created; both
47266
7fe3a8648ce2 Rename thread to _thread and dummy_thread to _dummy_thread. Issue #2875.
Georg Brandl <georg@python.org>
parents: 46304
diff changeset
593 # threads return -1 from _dummy_thread.get_ident() and thus have the
32778
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
594 # same key in the dict. So when the _MainThread instance created by
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
595 # 'threading' tries to clean itself up when atexit calls this method
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
596 # it gets a KeyError if another Thread instance was created.
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
597 #
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
598 # This all means that KeyError from trying to delete something from
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
599 # _active if dummy_threading is being used is a red herring. But
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
600 # since it isn't if dummy_threading is *not* being used then don't
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
601 # hide the exception.
32774
8a91cd7d7e82 Fix bug where a KeyError was raised if -O was being used for the interpreter
Brett Cannon <bcannon@gmail.com>
parents: 32673
diff changeset
602
44943
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parents: 44885
diff changeset
603 try:
46304
3442e9e6b2cf Merged revisions 61440-61441,61443,61445-61448,61451-61452,61455-61457,61459-61464,61466-61467,61469-61470,61476-61477,61479,61481-61482,61485,61487,61490,61493-61494,61497,61499-61502,61505-61506,61508,61511-61514,61519,61521-61522,61530-61531,61533-61537,61541-61555,61557-61558,61561-61562,61566-61569,61572-61574,61578-61579,61583-61584,61588-61589,61592,61594,61598-61601,61603-61604,61607-61612,61617,61619-61620,61624,61626,61628-61630,61635-61638,61640-61643,61645,61648,61653-61655,61659-61662,61664,61666,61668-61671,61673,61675,61679-61680,61682,61685-61686,61689-61695,61697-61699,61701-61703,61706,61710,61713,61717,61723,61726-61730,61736,61738,61740,61742,61745-61752,61754-61760,61762-61764,61768,61770-61772,61774-61775,61784-61787,61789-61792,61794-61795,61797-61806,61808-61809,61811-61812,61814-61819,61824,61826-61833,61835-61840,61843-61845,61848,61850,61854-61862,61865-61866,61868,61872-61873,61876-61877,61883-61888,61890-61891,61893-61899,61901-61903,61905-61912,61914,61917,61920-61921,61927,61930,61932-61934,61939,61941-61942,61944-61951,61955,61960-61963,61980,61982-61983,61991,61994-61996,62001-62003,62008-62010,62016-62017,62022,62024,62027,62031-62034,62041,62045-62046,62055-62058,62060-62066,62068-62074,62076-62079,62081-62083,62086-62089,62092-62094,62098,62101,62104,62106-62109,62115-62122,62124-62125,62127-62128,62130,62132,62134-62137,62139-62142,62144,62146-62148,62150-62152,62155-62161 via svnmerge from
Neal Norwitz <nnorwitz@gmail.com>
parents: 46161
diff changeset
604 with _active_limbo_lock:
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Brett Cannon <bcannon@gmail.com>
parents: 32673
diff changeset
605 del _active[_get_ident()]
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606 # There must not be any python code between the previous line
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607 # and after the lock is released. Otherwise a tracing function
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608 # could try to acquire the lock again in the same thread, (in
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609 # current_thread()), and would block.
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610 except KeyError:
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611 if 'dummy_threading' not in _sys.modules:
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612 raise
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613
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614 def join(self, timeout=None):
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615 if not self._initialized:
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616 raise RuntimeError("Thread.__init__() not called")
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617 if not self._started.is_set():
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618 raise RuntimeError("cannot join thread before it is started")
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619 if self is current_thread():
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620 raise RuntimeError("cannot join current thread")
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621
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622 if __debug__:
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623 if not self._stopped:
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624 self._note("%s.join(): waiting until thread stops", self)
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625
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626 self._block.acquire()
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627 try:
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628 if timeout is None:
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629 while not self._stopped:
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630 self._block.wait()
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631 if __debug__:
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632 self._note("%s.join(): thread stopped", self)
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633 else:
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634 deadline = _time() + timeout
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635 while not self._stopped:
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636 delay = deadline - _time()
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637 if delay <= 0:
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638 if __debug__:
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639 self._note("%s.join(): timed out", self)
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640 break
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641 self._block.wait(delay)
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642 else:
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643 if __debug__:
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644 self._note("%s.join(): thread stopped", self)
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645 finally:
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646 self._block.release()
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647
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648 @property
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649 def name(self):
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650 assert self._initialized, "Thread.__init__() not called"
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651 return self._name
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652
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653 @name.setter
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654 def name(self, name):
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655 assert self._initialized, "Thread.__init__() not called"
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656 self._name = str(name)
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657
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658 @property
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659 def ident(self):
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660 assert self._initialized, "Thread.__init__() not called"
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661 return self._ident
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662
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663 def is_alive(self):
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664 assert self._initialized, "Thread.__init__() not called"
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665 return self._started.is_set() and not self._stopped
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666
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Benjamin Peterson <benjamin@python.org>
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diff changeset
667 isAlive = is_alive
48757
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Benjamin Peterson <benjamin@python.org>
parents: 48748
diff changeset
668
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Benjamin Peterson <benjamin@python.org>
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diff changeset
669 @property
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670 def daemon(self):
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diff changeset
671 assert self._initialized, "Thread.__init__() not called"
e71c3223810f Get rid of all __private variables and methods in the threading module.
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diff changeset
672 return self._daemonic
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diff changeset
673
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Benjamin Peterson <benjamin@python.org>
parents: 48743
diff changeset
674 @daemon.setter
2614d501de9a change is_daemon, set_daemon, get_name, and set_name to properties
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parents: 48743
diff changeset
675 def daemon(self, daemonic):
42679
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676 if not self._initialized:
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677 raise RuntimeError("Thread.__init__() not called")
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678 if self._started.is_set():
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diff changeset
679 raise RuntimeError("cannot set daemon status of active thread");
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diff changeset
680 self._daemonic = daemonic
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681
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682 def isDaemon(self):
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683 return self.daemon
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684
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diff changeset
685 def setDaemon(self, daemonic):
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Benjamin Peterson <benjamin@python.org>
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diff changeset
686 self.daemon = daemonic
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diff changeset
687
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688 def getName(self):
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689 return self.name
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690
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691 def setName(self, name):
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diff changeset
692 self.name = name
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Benjamin Peterson <benjamin@python.org>
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693
19727
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
694 # The timer class was contributed by Itamar Shtull-Trauring
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
695
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
696 def Timer(*args, **kwargs):
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
697 return _Timer(*args, **kwargs)
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
698
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
699 class _Timer(Thread):
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
700 """Call a function after a specified number of seconds:
19953
0f9df563b65d Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 19727
diff changeset
701
19727
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
702 t = Timer(30.0, f, args=[], kwargs={})
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
703 t.start()
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
704 t.cancel() # stop the timer's action if it's still waiting
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
705 """
19953
0f9df563b65d Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 19727
diff changeset
706
19727
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
707 def __init__(self, interval, function, args=[], kwargs={}):
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
708 Thread.__init__(self)
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
709 self.interval = interval
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
710 self.function = function
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
711 self.args = args
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
712 self.kwargs = kwargs
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
713 self.finished = Event()
19953
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Tim Peters <tim.peters@gmail.com>
parents: 19727
diff changeset
714
19727
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
715 def cancel(self):
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
716 """Stop the timer if it hasn't finished yet"""
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
717 self.finished.set()
19953
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Tim Peters <tim.peters@gmail.com>
parents: 19727
diff changeset
718
19727
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
719 def run(self):
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
720 self.finished.wait(self.interval)
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Benjamin Peterson <benjamin@python.org>
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diff changeset
721 if not self.finished.is_set():
19727
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Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
722 self.function(*self.args, **self.kwargs)
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
723 self.finished.set()
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
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parents:
diff changeset
724
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
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parents:
diff changeset
725 # Special thread class to represent the main thread
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
726 # This is garbage collected through an exit handler
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Guido van Rossum <guido@python.org>
parents:
diff changeset
727
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
728 class _MainThread(Thread):
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
729
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
730 def __init__(self):
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
731 Thread.__init__(self, name="MainThread")
45549
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Christian Heimes <christian@cheimes.de>
parents: 45495
diff changeset
732 self._started.set()
52892
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Benjamin Peterson <benjamin@python.org>
parents: 49058
diff changeset
733 self._set_ident()
792bb885029f Merged revisions 70712,70714,70764-70765,70769-70771,70773,70776-70777,70788-70789,70824,70828,70832,70836,70842,70851,70855,70857,70866-70872,70883,70885,70893-70894,70896-70897,70903,70905-70907,70915,70927,70933,70951,70960,70962-70964,70998,71001,71006,71008,71010-71011,71019,71037,71056,71094,71101-71103,71106,71119,71123,71149-71150,71203,71212,71214-71217,71221,71240 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 49058
diff changeset
734 with _active_limbo_lock:
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parents: 49058
diff changeset
735 _active[self._ident] = self
7949
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parents:
diff changeset
736
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
737 def _set_daemon(self):
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22830
diff changeset
738 return False
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
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parents:
diff changeset
739
40582
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Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
740 def _exitfunc(self):
42679
e71c3223810f Get rid of all __private variables and methods in the threading module.
Guido van Rossum <guido@python.org>
parents: 42678
diff changeset
741 self._stop()
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
742 t = _pickSomeNonDaemonThread()
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
743 if t:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
744 if __debug__:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
745 self._note("%s: waiting for other threads", self)
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
746 while t:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
747 t.join()
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
748 t = _pickSomeNonDaemonThread()
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
749 if __debug__:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
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parents:
diff changeset
750 self._note("%s: exiting", self)
42679
e71c3223810f Get rid of all __private variables and methods in the threading module.
Guido van Rossum <guido@python.org>
parents: 42678
diff changeset
751 self._delete()
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
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parents:
diff changeset
752
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
753 def _pickSomeNonDaemonThread():
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
754 for t in enumerate():
48745
2614d501de9a change is_daemon, set_daemon, get_name, and set_name to properties
Benjamin Peterson <benjamin@python.org>
parents: 48743
diff changeset
755 if not t.daemon and t.is_alive():
7949
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Guido van Rossum <guido@python.org>
parents:
diff changeset
756 return t
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
757 return None
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
758
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
759
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
760 # Dummy thread class to represent threads not started here.
34363
35f31790c6f9 threading._DummyThread.__init__(): document obscure new code.
Tim Peters <tim.peters@gmail.com>
parents: 34361
diff changeset
761 # These aren't garbage collected when they die, nor can they be waited for.
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Benjamin Peterson <benjamin@python.org>
parents: 47555
diff changeset
762 # If they invoke anything in threading.py that calls current_thread(), they
34363
35f31790c6f9 threading._DummyThread.__init__(): document obscure new code.
Tim Peters <tim.peters@gmail.com>
parents: 34361
diff changeset
763 # leave an entry in the _active dict forever after.
47615
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Benjamin Peterson <benjamin@python.org>
parents: 47555
diff changeset
764 # Their purpose is to return *something* from current_thread().
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
765 # They are marked as daemon threads so we won't wait for them
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
766 # when we exit (conform previous semantics).
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
767
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
768 class _DummyThread(Thread):
15873
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Tim Peters <tim.peters@gmail.com>
parents: 15586
diff changeset
769
7949
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parents:
diff changeset
770 def __init__(self):
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
771 Thread.__init__(self, name=_newname("Dummy-%d"))
34363
35f31790c6f9 threading._DummyThread.__init__(): document obscure new code.
Tim Peters <tim.peters@gmail.com>
parents: 34361
diff changeset
772
35f31790c6f9 threading._DummyThread.__init__(): document obscure new code.
Tim Peters <tim.peters@gmail.com>
parents: 34361
diff changeset
773 # Thread.__block consumes an OS-level locking primitive, which
35f31790c6f9 threading._DummyThread.__init__(): document obscure new code.
Tim Peters <tim.peters@gmail.com>
parents: 34361
diff changeset
774 # can never be used by a _DummyThread. Since a _DummyThread
35f31790c6f9 threading._DummyThread.__init__(): document obscure new code.
Tim Peters <tim.peters@gmail.com>
parents: 34361
diff changeset
775 # instance is immortal, that's bad, so release this resource.
42679
e71c3223810f Get rid of all __private variables and methods in the threading module.
Guido van Rossum <guido@python.org>
parents: 42678
diff changeset
776 del self._block
34363
35f31790c6f9 threading._DummyThread.__init__(): document obscure new code.
Tim Peters <tim.peters@gmail.com>
parents: 34361
diff changeset
777
45549
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Christian Heimes <christian@cheimes.de>
parents: 45495
diff changeset
778
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Christian Heimes <christian@cheimes.de>
parents: 45495
diff changeset
779 self._started.set()
52892
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Benjamin Peterson <benjamin@python.org>
parents: 49058
diff changeset
780 self._set_ident()
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Benjamin Peterson <benjamin@python.org>
parents: 49058
diff changeset
781 with _active_limbo_lock:
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782 _active[self._ident] = self
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783
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parents:
diff changeset
784 def _set_daemon(self):
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Guido van Rossum <guido@python.org>
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diff changeset
785 return True
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parents:
diff changeset
786
21981
4e9cc26e03fd SF #515023. Make _DummyThread.join() signature match base class (Thread)
Neal Norwitz <nnorwitz@gmail.com>
parents: 21589
diff changeset
787 def join(self, timeout=None):
22867
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Guido van Rossum <guido@python.org>
parents: 22830
diff changeset
788 assert False, "cannot join a dummy thread"
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diff changeset
789
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parents:
diff changeset
790
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parents:
diff changeset
791 # Global API functions
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parents:
diff changeset
792
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diff changeset
793 def current_thread():
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parents:
diff changeset
794 try:
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Guido van Rossum <guido@python.org>
parents:
diff changeset
795 return _active[_get_ident()]
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parents:
diff changeset
796 except KeyError:
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797 ##print "current_thread(): no current thread for", _get_ident()
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parents:
diff changeset
798 return _DummyThread()
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diff changeset
799
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diff changeset
800 currentThread = current_thread
48757
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diff changeset
801
47615
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diff changeset
802 def active_count():
52892
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diff changeset
803 with _active_limbo_lock:
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Benjamin Peterson <benjamin@python.org>
parents: 49058
diff changeset
804 return len(_active) + len(_limbo)
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parents:
diff changeset
805
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diff changeset
806 activeCount = active_count
48757
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diff changeset
807
57121
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Antoine Pitrou <solipsis@pitrou.net>
parents: 56894
diff changeset
808 def _enumerate():
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parents: 56894
diff changeset
809 # Same as enumerate(), but without the lock. Internal use only.
4ea0a80ed76a Merged revisions 76119 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 56894
diff changeset
810 return list(_active.values()) + list(_limbo.values())
4ea0a80ed76a Merged revisions 76119 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 56894
diff changeset
811
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parents:
diff changeset
812 def enumerate():
52892
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parents: 49058
diff changeset
813 with _active_limbo_lock:
792bb885029f Merged revisions 70712,70714,70764-70765,70769-70771,70773,70776-70777,70788-70789,70824,70828,70832,70836,70842,70851,70855,70857,70866-70872,70883,70885,70893-70894,70896-70897,70903,70905-70907,70915,70927,70933,70951,70960,70962-70964,70998,71001,71006,71008,71010-71011,71019,71037,71056,71094,71101-71103,71106,71119,71123,71149-71150,71203,71212,71214-71217,71221,71240 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 49058
diff changeset
814 return list(_active.values()) + list(_limbo.values())
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parents:
diff changeset
815
47266
7fe3a8648ce2 Rename thread to _thread and dummy_thread to _dummy_thread. Issue #2875.
Georg Brandl <georg@python.org>
parents: 46304
diff changeset
816 from _thread import stack_size
39442
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Thomas Wouters <thomas@python.org>
parents: 38453
diff changeset
817
40582
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Thomas Wouters <thomas@python.org>
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diff changeset
818 # Create the main thread object,
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
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diff changeset
819 # and make it available for the interpreter
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diff changeset
820 # (Py_Main) as threading._shutdown.
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diff changeset
821
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diff changeset
822 _shutdown = _MainThread()._exitfunc
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diff changeset
823
32673
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Jim Fulton <jim@zope.com>
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diff changeset
824 # get thread-local implementation, either from the thread
97768d87394a Implemented thread-local data as proposed on python-dev:
Jim Fulton <jim@zope.com>
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diff changeset
825 # module, or from the python fallback
97768d87394a Implemented thread-local data as proposed on python-dev:
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diff changeset
826
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Jim Fulton <jim@zope.com>
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diff changeset
827 try:
47266
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Georg Brandl <georg@python.org>
parents: 46304
diff changeset
828 from _thread import _local as local
32673
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Jim Fulton <jim@zope.com>
parents: 32475
diff changeset
829 except ImportError:
97768d87394a Implemented thread-local data as proposed on python-dev:
Jim Fulton <jim@zope.com>
parents: 32475
diff changeset
830 from _threading_local import local
97768d87394a Implemented thread-local data as proposed on python-dev:
Jim Fulton <jim@zope.com>
parents: 32475
diff changeset
831
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diff changeset
832
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833 def _after_fork():
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diff changeset
834 # This function is called by Python/ceval.c:PyEval_ReInitThreads which
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diff changeset
835 # is called from PyOS_AfterFork. Here we cleanup threading module state
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diff changeset
836 # that should not exist after a fork.
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837
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diff changeset
838 # Reset _active_limbo_lock, in case we forked while the lock was held
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diff changeset
839 # by another (non-forked) thread. http://bugs.python.org/issue874900
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diff changeset
840 global _active_limbo_lock
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841 _active_limbo_lock = _allocate_lock()
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842
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843 # fork() only copied the current thread; clear references to others.
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844 new_active = {}
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845 current = current_thread()
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846 with _active_limbo_lock:
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847 for thread in _active.values():
48516
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848 if thread is current:
49058
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parents: 48941
diff changeset
849 # There is only one active thread. We reset the ident to
179f8d89ad19 Issue #874900: fix behaviour of threading module after a fork.
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parents: 48941
diff changeset
850 # its new value since it can have changed.
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diff changeset
851 ident = _get_ident()
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852 thread._ident = ident
48516
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853 new_active[ident] = thread
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854 else:
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855 # All the others are already stopped.
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856 # We don't call _Thread__stop() because it tries to acquire
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parents: 47669
diff changeset
857 # thread._Thread__block which could also have been held while
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858 # we forked.
49058
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859 thread._stopped = True
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860
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diff changeset
861 _limbo.clear()
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862 _active.clear()
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863 _active.update(new_active)
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864 assert len(_active) == 1
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865
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866
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diff changeset
867 # Self-test code
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diff changeset
868
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parents:
diff changeset
869 def _test():
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diff changeset
870
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diff changeset
871 class BoundedQueue(_Verbose):
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parents:
diff changeset
872
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diff changeset
873 def __init__(self, limit):
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parents:
diff changeset
874 _Verbose.__init__(self)
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parents:
diff changeset
875 self.mon = RLock()
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parents:
diff changeset
876 self.rc = Condition(self.mon)
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parents:
diff changeset
877 self.wc = Condition(self.mon)
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parents:
diff changeset
878 self.limit = limit
31436
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parents: 30862
diff changeset
879 self.queue = deque()
7949
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diff changeset
880
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parents:
diff changeset
881 def put(self, item):
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parents:
diff changeset
882 self.mon.acquire()
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parents:
diff changeset
883 while len(self.queue) >= self.limit:
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parents:
diff changeset
884 self._note("put(%s): queue full", item)
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diff changeset
885 self.wc.wait()
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parents:
diff changeset
886 self.queue.append(item)
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parents:
diff changeset
887 self._note("put(%s): appended, length now %d",
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Guido van Rossum <guido@python.org>
parents:
diff changeset
888 item, len(self.queue))
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parents:
diff changeset
889 self.rc.notify()
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parents:
diff changeset
890 self.mon.release()
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parents:
diff changeset
891
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parents:
diff changeset
892 def get(self):
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parents:
diff changeset
893 self.mon.acquire()
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parents:
diff changeset
894 while not self.queue:
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parents:
diff changeset
895 self._note("get(): queue empty")
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Guido van Rossum <guido@python.org>
parents:
diff changeset
896 self.rc.wait()
31436
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Raymond Hettinger <python@rcn.com>
parents: 30862
diff changeset
897 item = self.queue.popleft()
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parents:
diff changeset
898 self._note("get(): got %s, %d left", item, len(self.queue))
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diff changeset
899 self.wc.notify()
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diff changeset
900 self.mon.release()
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parents:
diff changeset
901 return item
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diff changeset
902
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Guido van Rossum <guido@python.org>
parents:
diff changeset
903 class ProducerThread(Thread):
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Guido van Rossum <guido@python.org>
parents:
diff changeset
904
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Guido van Rossum <guido@python.org>
parents:
diff changeset
905 def __init__(self, queue, quota):
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
906 Thread.__init__(self, name="Producer")
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
907 self.queue = queue
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
908 self.quota = quota
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
909
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
910 def run(self):
8394
93aa08c77e60 Use random instead of whrandom.
Guido van Rossum <guido@python.org>
parents: 7949
diff changeset
911 from random import random
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
912 counter = 0
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
913 while counter < self.quota:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
914 counter = counter + 1
48745
2614d501de9a change is_daemon, set_daemon, get_name, and set_name to properties
Benjamin Peterson <benjamin@python.org>
parents: 48743
diff changeset
915 self.queue.put("%s.%d" % (self.name, counter))
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
916 _sleep(random() * 0.00001)
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
917
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
918
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
919 class ConsumerThread(Thread):
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
920
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
921 def __init__(self, queue, count):
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
922 Thread.__init__(self, name="Consumer")
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
923 self.queue = queue
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
924 self.count = count
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
925
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
926 def run(self):
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
927 while self.count > 0:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
928 item = self.queue.get()
40775
4cdf21a0dbbc Fix most trivially-findable print statements.
Guido van Rossum <guido@python.org>
parents: 40582
diff changeset
929 print(item)
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
930 self.count = self.count - 1
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
931
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
932 NP = 3
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
933 QL = 4
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
934 NI = 5
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
935
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
936 Q = BoundedQueue(QL)
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
937 P = []
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
938 for i in range(NP):
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
939 t = ProducerThread(Q, NI)
48745
2614d501de9a change is_daemon, set_daemon, get_name, and set_name to properties
Benjamin Peterson <benjamin@python.org>
parents: 48743
diff changeset
940 t.name = "Producer-%d" % (i+1)
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
941 P.append(t)
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
942 C = ConsumerThread(Q, NI*NP)
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
943 for t in P:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
944 t.start()
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
945 _sleep(0.000001)
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
946 C.start()
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
947 for t in P:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
948 t.join()
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
949 C.join()
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
950
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
951 if __name__ == '__main__':
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
952 _test()