annotate Lib/threading.py @ 67467:abe201dfd3dc 3.1

Merged revisions 87861,87863 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r87861 | antoine.pitrou | 2011-01-08 11:23:29 +0100 (sam., 08 janv. 2011) | 3 lines Fix test_ssl after r87849 ........ r87863 | antoine.pitrou | 2011-01-08 11:28:11 +0100 (sam., 08 janv. 2011) | 3 lines Add EHOSTUNREACH ('No route to host') to the errnos trapped by transient_internet(). ........
author Antoine Pitrou <solipsis@pitrou.net>
date Sat, 08 Jan 2011 10:31:09 +0000
parents a3b7c290754a
children 3c9232a684ae
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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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44
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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 # Issue #4188: calling current_thread() can incur an infinite
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54 # recursion if it has to create a DummyThread on the fly.
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55 ident = _get_ident()
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56 try:
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57 name = _active[ident].name
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58 except KeyError:
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59 name = "<OS thread %d>" % ident
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60 format = "%s: %s\n" % (name, format)
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61 _sys.stderr.write(format)
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62
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63 else:
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64 # Disable this when using "python -O"
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65 class _Verbose(object):
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66 def __init__(self, verbose=None):
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67 pass
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68 def _note(self, *args):
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69 pass
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70
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71 # Support for profile and trace hooks
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72
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73 _profile_hook = None
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74 _trace_hook = None
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75
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76 def setprofile(func):
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77 global _profile_hook
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78 _profile_hook = func
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79
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80 def settrace(func):
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81 global _trace_hook
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82 _trace_hook = func
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83
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84 # Synchronization classes
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85
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86 Lock = _allocate_lock
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87
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88 def RLock(*args, **kwargs):
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89 return _RLock(*args, **kwargs)
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90
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91 class _RLock(_Verbose):
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92
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93 def __init__(self, verbose=None):
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94 _Verbose.__init__(self, verbose)
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95 self._block = _allocate_lock()
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96 self._owner = None
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97 self._count = 0
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98
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99 def __repr__(self):
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100 owner = self._owner
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101 try:
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102 owner = _active[owner].name
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103 except KeyError:
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104 pass
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105 return "<%s owner=%r count=%d>" % (
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106 self.__class__.__name__, owner, self._count)
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107
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108 def acquire(self, blocking=True):
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109 me = _get_ident()
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110 if self._owner == me:
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111 self._count = self._count + 1
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112 if __debug__:
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113 self._note("%s.acquire(%s): recursive success", self, blocking)
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114 return 1
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115 rc = self._block.acquire(blocking)
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116 if rc:
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117 self._owner = me
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118 self._count = 1
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119 if __debug__:
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120 self._note("%s.acquire(%s): initial success", self, blocking)
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121 else:
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122 if __debug__:
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123 self._note("%s.acquire(%s): failure", self, blocking)
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124 return rc
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125
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126 __enter__ = acquire
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127
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128 def release(self):
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129 if self._owner != _get_ident():
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130 raise RuntimeError("cannot release un-acquired lock")
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131 self._count = count = self._count - 1
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132 if not count:
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133 self._owner = None
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134 self._block.release()
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135 if __debug__:
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136 self._note("%s.release(): final release", self)
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137 else:
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138 if __debug__:
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139 self._note("%s.release(): non-final release", self)
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140
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141 def __exit__(self, t, v, tb):
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142 self.release()
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143
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144 # Internal methods used by condition variables
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145
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146 def _acquire_restore(self, state):
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147 self._block.acquire()
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148 self._count, self._owner = state
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149 if __debug__:
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150 self._note("%s._acquire_restore()", self)
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151
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152 def _release_save(self):
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153 if __debug__:
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154 self._note("%s._release_save()", self)
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155 count = self._count
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156 self._count = 0
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157 owner = self._owner
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158 self._owner = None
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159 self._block.release()
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160 return (count, owner)
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161
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162 def _is_owned(self):
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163 return self._owner == _get_ident()
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164
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165
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166 def Condition(*args, **kwargs):
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167 return _Condition(*args, **kwargs)
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168
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169 class _Condition(_Verbose):
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170
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171 def __init__(self, lock=None, verbose=None):
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172 _Verbose.__init__(self, verbose)
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173 if lock is None:
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174 lock = RLock()
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175 self._lock = lock
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176 # Export the lock's acquire() and release() methods
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177 self.acquire = lock.acquire
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178 self.release = lock.release
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179 # If the lock defines _release_save() and/or _acquire_restore(),
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180 # these override the default implementations (which just call
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181 # release() and acquire() on the lock). Ditto for _is_owned().
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182 try:
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183 self._release_save = lock._release_save
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184 except AttributeError:
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185 pass
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186 try:
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187 self._acquire_restore = lock._acquire_restore
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188 except AttributeError:
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189 pass
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190 try:
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191 self._is_owned = lock._is_owned
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192 except AttributeError:
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193 pass
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194 self._waiters = []
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195
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196 def __enter__(self):
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197 return self._lock.__enter__()
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198
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199 def __exit__(self, *args):
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200 return self._lock.__exit__(*args)
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201
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202 def __repr__(self):
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203 return "<Condition(%s, %d)>" % (self._lock, len(self._waiters))
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204
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205 def _release_save(self):
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206 self._lock.release() # No state to save
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207
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208 def _acquire_restore(self, x):
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209 self._lock.acquire() # Ignore saved state
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210
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211 def _is_owned(self):
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212 # Return True if lock is owned by current_thread.
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213 # This method is called only if __lock doesn't have _is_owned().
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214 if self._lock.acquire(0):
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215 self._lock.release()
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216 return False
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217 else:
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218 return True
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219
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220 def wait(self, timeout=None):
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221 if not self._is_owned():
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222 raise RuntimeError("cannot wait on un-acquired lock")
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223 waiter = _allocate_lock()
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224 waiter.acquire()
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225 self._waiters.append(waiter)
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226 saved_state = self._release_save()
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227 try: # restore state no matter what (e.g., KeyboardInterrupt)
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228 if timeout is None:
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229 waiter.acquire()
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230 if __debug__:
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231 self._note("%s.wait(): got it", self)
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232 else:
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233 # Balancing act: We can't afford a pure busy loop, so we
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234 # have to sleep; but if we sleep the whole timeout time,
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235 # we'll be unresponsive. The scheme here sleeps very
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236 # little at first, longer as time goes on, but never longer
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237 # than 20 times per second (or the timeout time remaining).
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238 endtime = _time() + timeout
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239 delay = 0.0005 # 500 us -> initial delay of 1 ms
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240 while True:
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241 gotit = waiter.acquire(0)
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242 if gotit:
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243 break
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244 remaining = endtime - _time()
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245 if remaining <= 0:
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246 break
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247 delay = min(delay * 2, remaining, .05)
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248 _sleep(delay)
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249 if not gotit:
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250 if __debug__:
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251 self._note("%s.wait(%s): timed out", self, timeout)
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252 try:
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253 self._waiters.remove(waiter)
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254 except ValueError:
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255 pass
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256 else:
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257 if __debug__:
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258 self._note("%s.wait(%s): got it", self, timeout)
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259 finally:
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260 self._acquire_restore(saved_state)
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261
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262 def notify(self, n=1):
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263 if not self._is_owned():
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264 raise RuntimeError("cannot notify on un-acquired lock")
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265 __waiters = self._waiters
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266 waiters = __waiters[:n]
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267 if not waiters:
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268 if __debug__:
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269 self._note("%s.notify(): no waiters", self)
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270 return
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271 self._note("%s.notify(): notifying %d waiter%s", self, n,
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272 n!=1 and "s" or "")
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273 for waiter in waiters:
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274 waiter.release()
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275 try:
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276 __waiters.remove(waiter)
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277 except ValueError:
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278 pass
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279
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280 def notify_all(self):
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281 self.notify(len(self._waiters))
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282
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283 notifyAll = notify_all
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284
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285
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286 def Semaphore(*args, **kwargs):
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287 return _Semaphore(*args, **kwargs)
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288
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289 class _Semaphore(_Verbose):
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290
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291 # After Tim Peters' semaphore class, but not quite the same (no maximum)
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292
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293 def __init__(self, value=1, verbose=None):
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294 if value < 0:
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295 raise ValueError("semaphore initial value must be >= 0")
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296 _Verbose.__init__(self, verbose)
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297 self._cond = Condition(Lock())
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298 self._value = value
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299
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300 def acquire(self, blocking=True):
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301 rc = False
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302 self._cond.acquire()
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303 while self._value == 0:
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304 if not blocking:
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305 break
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306 if __debug__:
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307 self._note("%s.acquire(%s): blocked waiting, value=%s",
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308 self, blocking, self._value)
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309 self._cond.wait()
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310 else:
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311 self._value = self._value - 1
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312 if __debug__:
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313 self._note("%s.acquire: success, value=%s",
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314 self, self._value)
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315 rc = True
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316 self._cond.release()
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317 return rc
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318
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319 __enter__ = acquire
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320
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321 def release(self):
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322 self._cond.acquire()
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323 self._value = self._value + 1
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324 if __debug__:
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325 self._note("%s.release: success, value=%s",
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326 self, self._value)
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327 self._cond.notify()
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328 self._cond.release()
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329
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330 def __exit__(self, t, v, tb):
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331 self.release()
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332
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333
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334 def BoundedSemaphore(*args, **kwargs):
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335 return _BoundedSemaphore(*args, **kwargs)
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336
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337 class _BoundedSemaphore(_Semaphore):
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338 """Semaphore that checks that # releases is <= # acquires"""
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339 def __init__(self, value=1, verbose=None):
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340 _Semaphore.__init__(self, value, verbose)
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341 self._initial_value = value
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342
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343 def release(self):
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344 if self._value >= self._initial_value:
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345 raise ValueError("Semaphore released too many times")
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346 return _Semaphore.release(self)
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347
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348
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349 def Event(*args, **kwargs):
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350 return _Event(*args, **kwargs)
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351
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352 class _Event(_Verbose):
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353
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354 # After Tim Peters' event class (without is_posted())
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355
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356 def __init__(self, verbose=None):
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357 _Verbose.__init__(self, verbose)
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358 self._cond = Condition(Lock())
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359 self._flag = False
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360
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361 def _reset_internal_locks(self):
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362 # private! called by Thread._reset_internal_locks by _after_fork()
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363 self._cond.__init__()
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364
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365 def is_set(self):
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366 return self._flag
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367
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368 isSet = is_set
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369
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370 def set(self):
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371 self._cond.acquire()
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372 try:
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373 self._flag = True
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374 self._cond.notify_all()
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375 finally:
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376 self._cond.release()
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377
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378 def clear(self):
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379 self._cond.acquire()
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380 try:
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381 self._flag = False
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382 finally:
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383 self._cond.release()
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384
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385 def wait(self, timeout=None):
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386 self._cond.acquire()
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387 try:
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388 if not self._flag:
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389 self._cond.wait(timeout)
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390 return self._flag
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391 finally:
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392 self._cond.release()
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393
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394 # Helper to generate new thread names
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395 _counter = 0
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396 def _newname(template="Thread-%d"):
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397 global _counter
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398 _counter = _counter + 1
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399 return template % _counter
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400
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401 # Active thread administration
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402 _active_limbo_lock = _allocate_lock()
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403 _active = {} # maps thread id to Thread object
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404 _limbo = {}
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405
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406
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407 # Main class for threads
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408
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409 class Thread(_Verbose):
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410
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411 __initialized = False
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412 # Need to store a reference to sys.exc_info for printing
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413 # out exceptions when a thread tries to use a global var. during interp.
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414 # shutdown and thus raises an exception about trying to perform some
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415 # operation on/with a NoneType
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416 __exc_info = _sys.exc_info
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417 # Keep sys.exc_clear too to clear the exception just before
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418 # allowing .join() to return.
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419 #XXX __exc_clear = _sys.exc_clear
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420
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421 def __init__(self, group=None, target=None, name=None,
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422 args=(), kwargs=None, verbose=None):
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423 assert group is None, "group argument must be None for now"
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424 _Verbose.__init__(self, verbose)
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425 if kwargs is None:
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426 kwargs = {}
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427 self._target = target
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428 self._name = str(name or _newname())
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429 self._args = args
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430 self._kwargs = kwargs
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431 self._daemonic = self._set_daemon()
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432 self._ident = None
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433 self._started = Event()
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434 self._stopped = False
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435 self._block = Condition(Lock())
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436 self._initialized = True
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437 # sys.stderr is not stored in the class like
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438 # sys.exc_info since it can be changed between instances
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439 self._stderr = _sys.stderr
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440
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441 def _reset_internal_locks(self):
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442 # private! Called by _after_fork() to reset our internal locks as
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443 # they may be in an invalid state leading to a deadlock or crash.
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444 if hasattr(self, '_block'): # DummyThread deletes _block
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445 self._block.__init__()
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446 self._started._reset_internal_locks()
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447
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448 def _set_daemon(self):
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449 # Overridden in _MainThread and _DummyThread
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450 return current_thread().daemon
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451
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452 def __repr__(self):
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453 assert self._initialized, "Thread.__init__() was not called"
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454 status = "initial"
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455 if self._started.is_set():
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456 status = "started"
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457 if self._stopped:
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458 status = "stopped"
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459 if self._daemonic:
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460 status += " daemon"
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461 if self._ident is not None:
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462 status += " %s" % self._ident
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463 return "<%s(%s, %s)>" % (self.__class__.__name__, self._name, status)
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464
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465 def start(self):
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466 if not self._initialized:
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467 raise RuntimeError("thread.__init__() not called")
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468
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469 if self._started.is_set():
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470 raise RuntimeError("threads can only be started once")
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471 if __debug__:
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472 self._note("%s.start(): starting thread", self)
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473 with _active_limbo_lock:
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474 _limbo[self] = self
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475 try:
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476 _start_new_thread(self._bootstrap, ())
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477 except Exception:
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478 with _active_limbo_lock:
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479 del _limbo[self]
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480 raise
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481 self._started.wait()
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482
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483 def run(self):
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484 try:
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485 if self._target:
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486 self._target(*self._args, **self._kwargs)
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487 finally:
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488 # Avoid a refcycle if the thread is running a function with
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489 # an argument that has a member that points to the thread.
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490 del self._target, self._args, self._kwargs
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491
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492 def _bootstrap(self):
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493 # Wrapper around the real bootstrap code that ignores
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494 # exceptions during interpreter cleanup. Those typically
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495 # happen when a daemon thread wakes up at an unfortunate
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496 # moment, finds the world around it destroyed, and raises some
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497 # random exception *** while trying to report the exception in
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498 # _bootstrap_inner() below ***. Those random exceptions
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499 # don't help anybody, and they confuse users, so we suppress
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500 # them. We suppress them only when it appears that the world
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501 # indeed has already been destroyed, so that exceptions in
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502 # _bootstrap_inner() during normal business hours are properly
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503 # reported. Also, we only suppress them for daemonic threads;
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504 # if a non-daemonic encounters this, something else is wrong.
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diff changeset
505 try:
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506 self._bootstrap_inner()
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507 except:
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508 if self._daemonic and _sys is None:
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509 return
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diff changeset
510 raise
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511
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diff changeset
512 def _set_ident(self):
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513 self._ident = _get_ident()
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514
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515 def _bootstrap_inner(self):
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516 try:
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diff changeset
517 self._set_ident()
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518 self._started.set()
52892
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diff changeset
519 with _active_limbo_lock:
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520 _active[self._ident] = self
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521 del _limbo[self]
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522 if __debug__:
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523 self._note("%s._bootstrap(): thread started", self)
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524
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diff changeset
525 if _trace_hook:
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526 self._note("%s._bootstrap(): registering trace hook", self)
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Jeremy Hylton <jeremy@alum.mit.edu>
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527 _sys.settrace(_trace_hook)
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528 if _profile_hook:
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529 self._note("%s._bootstrap(): registering profile hook", self)
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Jeremy Hylton <jeremy@alum.mit.edu>
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530 _sys.setprofile(_profile_hook)
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parents: 29683
diff changeset
531
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532 try:
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533 self.run()
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534 except SystemExit:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
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parents:
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535 if __debug__:
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536 self._note("%s._bootstrap(): raised SystemExit", self)
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parents:
diff changeset
537 except:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
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parents:
diff changeset
538 if __debug__:
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Christian Heimes <christian@cheimes.de>
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539 self._note("%s._bootstrap(): unhandled exception", self)
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Brett Cannon <bcannon@gmail.com>
parents: 31629
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540 # If sys.stderr is no more (most likely from interpreter
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parents: 42678
diff changeset
541 # shutdown) use self._stderr. Otherwise still use sys (as in
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Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
542 # _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
543 # self.
796ccb9082ef threading.Thread objects will now print a traceback for an exception raised
Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
544 if _sys:
796ccb9082ef threading.Thread objects will now print a traceback for an exception raised
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parents: 31629
diff changeset
545 _sys.stderr.write("Exception in thread %s:\n%s\n" %
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Benjamin Peterson <benjamin@python.org>
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diff changeset
546 (self.name, _format_exc()))
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547 else:
796ccb9082ef threading.Thread objects will now print a traceback for an exception raised
Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
548 # 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
549 # 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
550 # Lib/traceback.py)
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diff changeset
551 exc_type, exc_value, exc_tb = self._exc_info()
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diff changeset
552 try:
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parents: 40582
diff changeset
553 print((
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Benjamin Peterson <benjamin@python.org>
parents: 48743
diff changeset
554 "Exception in thread " + self.name +
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555 " (most likely raised during interpreter shutdown):"), file=self._stderr)
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diff changeset
556 print((
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557 "Traceback (most recent call last):"), file=self._stderr)
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558 while exc_tb:
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diff changeset
559 print((
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560 ' File "%s", line %s, in %s' %
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parents: 31629
diff changeset
561 (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>
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562 exc_tb.tb_lineno,
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563 exc_tb.tb_frame.f_code.co_name)), file=self._stderr)
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564 exc_tb = exc_tb.tb_next
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diff changeset
565 print(("%s: %s" % (exc_type, exc_value)), file=self._stderr)
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Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
566 # 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
567 # 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
568 finally:
796ccb9082ef threading.Thread objects will now print a traceback for an exception raised
Brett Cannon <bcannon@gmail.com>
parents: 31629
diff changeset
569 del exc_type, exc_value, exc_tb
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parents:
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570 else:
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parents:
diff changeset
571 if __debug__:
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572 self._note("%s._bootstrap(): normal return", self)
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573 finally:
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574 # Prevent a race in
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575 # test_threading.test_no_refcycle_through_target when
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576 # the exception keeps the target alive past when we
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diff changeset
577 # assert that it's dead.
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578 #XXX self.__exc_clear()
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579 pass
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580 finally:
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parents: 43020
diff changeset
581 with _active_limbo_lock:
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582 self._stop()
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diff changeset
583 try:
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parents: 47266
diff changeset
584 # We don't call self._delete() because it also
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diff changeset
585 # grabs _active_limbo_lock.
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parents: 43020
diff changeset
586 del _active[_get_ident()]
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parents: 43020
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587 except:
fefaa0e66fdd Merged revisions 60176-60209 via svnmerge from
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parents: 43020
diff changeset
588 pass
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parents:
diff changeset
589
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diff changeset
590 def _stop(self):
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diff changeset
591 self._block.acquire()
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592 self._stopped = True
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593 self._block.notify_all()
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diff changeset
594 self._block.release()
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Guido van Rossum <guido@python.org>
parents:
diff changeset
595
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Guido van Rossum <guido@python.org>
parents: 42678
diff changeset
596 def _delete(self):
32778
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
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parents: 32774
diff changeset
597 "Remove current thread from the dict of currently running threads."
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Brett Cannon <bcannon@gmail.com>
parents: 32673
diff changeset
598
47266
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Georg Brandl <georg@python.org>
parents: 46304
diff changeset
599 # Notes about running with _dummy_thread:
32778
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parents: 32774
diff changeset
600 #
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parents: 46304
diff changeset
601 # Must take care to not raise an exception if _dummy_thread is being
32778
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
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parents: 32774
diff changeset
602 # 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
603 # 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
604 # 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
605 # 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
606 # 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
607 #
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
608 # 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
609 # 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
610 # 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
611 # 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
612 # '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
613 # 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
614 #
7af695bc5480 Thread.__delete: Discussion of internal obscurities belongs in comments
Tim Peters <tim.peters@gmail.com>
parents: 32774
diff changeset
615 # 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
616 # _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
617 # 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
618 # hide the exception.
32774
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Brett Cannon <bcannon@gmail.com>
parents: 32673
diff changeset
619
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Christian Heimes <christian@cheimes.de>
parents: 44885
diff changeset
620 try:
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Neal Norwitz <nnorwitz@gmail.com>
parents: 46161
diff changeset
621 with _active_limbo_lock:
32774
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Brett Cannon <bcannon@gmail.com>
parents: 32673
diff changeset
622 del _active[_get_ident()]
46304
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Neal Norwitz <nnorwitz@gmail.com>
parents: 46161
diff changeset
623 # There must not be any python code between the previous line
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Neal Norwitz <nnorwitz@gmail.com>
parents: 46161
diff changeset
624 # and after the lock is released. Otherwise a tracing function
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parents: 46161
diff changeset
625 # could try to acquire the lock again in the same thread, (in
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diff changeset
626 # current_thread()), and would block.
46304
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Neal Norwitz <nnorwitz@gmail.com>
parents: 46161
diff changeset
627 except KeyError:
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Neal Norwitz <nnorwitz@gmail.com>
parents: 46161
diff changeset
628 if 'dummy_threading' not in _sys.modules:
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Neal Norwitz <nnorwitz@gmail.com>
parents: 46161
diff changeset
629 raise
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Guido van Rossum <guido@python.org>
parents:
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630
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
631 def join(self, timeout=None):
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Guido van Rossum <guido@python.org>
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632 if not self._initialized:
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633 raise RuntimeError("Thread.__init__() not called")
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634 if not self._started.is_set():
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635 raise RuntimeError("cannot join thread before it is started")
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636 if self is current_thread():
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637 raise RuntimeError("cannot join current thread")
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638
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Guido van Rossum <guido@python.org>
parents:
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639 if __debug__:
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Guido van Rossum <guido@python.org>
parents: 42678
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640 if not self._stopped:
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parents:
diff changeset
641 self._note("%s.join(): waiting until thread stops", self)
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Christian Heimes <christian@cheimes.de>
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diff changeset
642
6547be11f443 Merged revisions 60245-60277 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 44885
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643 self._block.acquire()
6547be11f443 Merged revisions 60245-60277 via svnmerge from
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parents: 44885
diff changeset
644 try:
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645 if timeout is None:
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Guido van Rossum <guido@python.org>
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646 while not self._stopped:
e71c3223810f Get rid of all __private variables and methods in the threading module.
Guido van Rossum <guido@python.org>
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647 self._block.wait()
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parents:
diff changeset
648 if __debug__:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
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parents:
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649 self._note("%s.join(): thread stopped", self)
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650 else:
b7c6c461a808 Prevent threading.Thread.join() from blocking when a previous call raised an
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parents: 35236
diff changeset
651 deadline = _time() + timeout
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diff changeset
652 while not self._stopped:
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Brett Cannon <bcannon@gmail.com>
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653 delay = deadline - _time()
b7c6c461a808 Prevent threading.Thread.join() from blocking when a previous call raised an
Brett Cannon <bcannon@gmail.com>
parents: 35236
diff changeset
654 if delay <= 0:
b7c6c461a808 Prevent threading.Thread.join() from blocking when a previous call raised an
Brett Cannon <bcannon@gmail.com>
parents: 35236
diff changeset
655 if __debug__:
b7c6c461a808 Prevent threading.Thread.join() from blocking when a previous call raised an
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parents: 35236
diff changeset
656 self._note("%s.join(): timed out", self)
b7c6c461a808 Prevent threading.Thread.join() from blocking when a previous call raised an
Brett Cannon <bcannon@gmail.com>
parents: 35236
diff changeset
657 break
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658 self._block.wait(delay)
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Brett Cannon <bcannon@gmail.com>
parents: 35236
diff changeset
659 else:
b7c6c461a808 Prevent threading.Thread.join() from blocking when a previous call raised an
Brett Cannon <bcannon@gmail.com>
parents: 35236
diff changeset
660 if __debug__:
b7c6c461a808 Prevent threading.Thread.join() from blocking when a previous call raised an
Brett Cannon <bcannon@gmail.com>
parents: 35236
diff changeset
661 self._note("%s.join(): thread stopped", self)
44943
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662 finally:
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Christian Heimes <christian@cheimes.de>
parents: 44885
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663 self._block.release()
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parents:
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664
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665 @property
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666 def name(self):
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667 assert self._initialized, "Thread.__init__() not called"
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668 return self._name
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parents:
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669
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Benjamin Peterson <benjamin@python.org>
parents: 48743
diff changeset
670 @name.setter
2614d501de9a change is_daemon, set_daemon, get_name, and set_name to properties
Benjamin Peterson <benjamin@python.org>
parents: 48743
diff changeset
671 def name(self, name):
42679
e71c3223810f Get rid of all __private variables and methods in the threading module.
Guido van Rossum <guido@python.org>
parents: 42678
diff changeset
672 assert self._initialized, "Thread.__init__() not called"
e71c3223810f Get rid of all __private variables and methods in the threading module.
Guido van Rossum <guido@python.org>
parents: 42678
diff changeset
673 self._name = str(name)
7949
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parents:
diff changeset
674
48743
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Benjamin Peterson <benjamin@python.org>
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diff changeset
675 @property
76620010d782 Merged revisions 65818 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 48516
diff changeset
676 def ident(self):
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
677 assert self._initialized, "Thread.__init__() not called"
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
678 return self._ident
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
679
47615
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Benjamin Peterson <benjamin@python.org>
parents: 47555
diff changeset
680 def is_alive(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
681 assert self._initialized, "Thread.__init__() not called"
47615
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Benjamin Peterson <benjamin@python.org>
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diff changeset
682 return self._started.is_set() and not self._stopped
15873
3dd217fbdd59 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15586
diff changeset
683
48941
4fc480be1e4d remove the deprecation warnings for the old threading API; update the docs
Benjamin Peterson <benjamin@python.org>
parents: 48757
diff changeset
684 isAlive = is_alive
48757
54138ee20e57 add full deprecation warnings for old threading APIs
Benjamin Peterson <benjamin@python.org>
parents: 48748
diff changeset
685
48745
2614d501de9a change is_daemon, set_daemon, get_name, and set_name to properties
Benjamin Peterson <benjamin@python.org>
parents: 48743
diff changeset
686 @property
2614d501de9a change is_daemon, set_daemon, get_name, and set_name to properties
Benjamin Peterson <benjamin@python.org>
parents: 48743
diff changeset
687 def daemon(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
688 assert self._initialized, "Thread.__init__() not called"
e71c3223810f Get rid of all __private variables and methods in the threading module.
Guido van Rossum <guido@python.org>
parents: 42678
diff changeset
689 return self._daemonic
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
690
48745
2614d501de9a change is_daemon, set_daemon, get_name, and set_name to properties
Benjamin Peterson <benjamin@python.org>
parents: 48743
diff changeset
691 @daemon.setter
2614d501de9a change is_daemon, set_daemon, get_name, and set_name to properties
Benjamin Peterson <benjamin@python.org>
parents: 48743
diff changeset
692 def daemon(self, daemonic):
42679
e71c3223810f Get rid of all __private variables and methods in the threading module.
Guido van Rossum <guido@python.org>
parents: 42678
diff changeset
693 if not self._initialized:
42084
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Guido van Rossum <guido@python.org>
parents: 41717
diff changeset
694 raise RuntimeError("Thread.__init__() not called")
47615
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Benjamin Peterson <benjamin@python.org>
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diff changeset
695 if self._started.is_set():
42084
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Guido van Rossum <guido@python.org>
parents: 41717
diff changeset
696 raise RuntimeError("cannot set daemon status of active thread");
42679
e71c3223810f Get rid of all __private variables and methods in the threading module.
Guido van Rossum <guido@python.org>
parents: 42678
diff changeset
697 self._daemonic = daemonic
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
698
48748
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Benjamin Peterson <benjamin@python.org>
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diff changeset
699 def isDaemon(self):
d6537a3e1b73 Merged revisions 65826 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 48745
diff changeset
700 return self.daemon
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Benjamin Peterson <benjamin@python.org>
parents: 48745
diff changeset
701
d6537a3e1b73 Merged revisions 65826 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 48745
diff changeset
702 def setDaemon(self, daemonic):
d6537a3e1b73 Merged revisions 65826 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 48745
diff changeset
703 self.daemon = daemonic
d6537a3e1b73 Merged revisions 65826 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 48745
diff changeset
704
d6537a3e1b73 Merged revisions 65826 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 48745
diff changeset
705 def getName(self):
d6537a3e1b73 Merged revisions 65826 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 48745
diff changeset
706 return self.name
d6537a3e1b73 Merged revisions 65826 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 48745
diff changeset
707
d6537a3e1b73 Merged revisions 65826 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 48745
diff changeset
708 def setName(self, name):
d6537a3e1b73 Merged revisions 65826 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 48745
diff changeset
709 self.name = name
d6537a3e1b73 Merged revisions 65826 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 48745
diff changeset
710
19727
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
711 # 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
712
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
713 def Timer(*args, **kwargs):
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
714 return _Timer(*args, **kwargs)
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
715
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
716 class _Timer(Thread):
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
717 """Call a function after a specified number of seconds:
19953
0f9df563b65d Whitespace normalization.
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 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
720 t.start()
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
721 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
722 """
19953
0f9df563b65d Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 19727
diff changeset
723
19727
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
724 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
725 Thread.__init__(self)
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
726 self.interval = interval
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
727 self.function = function
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
728 self.args = args
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
729 self.kwargs = kwargs
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
730 self.finished = Event()
19953
0f9df563b65d Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 19727
diff changeset
731
19727
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
732 def cancel(self):
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
733 """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
734 self.finished.set()
19953
0f9df563b65d Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 19727
diff changeset
735
19727
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
736 def run(self):
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
737 self.finished.wait(self.interval)
47615
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Benjamin Peterson <benjamin@python.org>
parents: 47555
diff changeset
738 if not self.finished.is_set():
19727
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
739 self.function(*self.args, **self.kwargs)
f3036d4e3c22 Patch #428326: New class threading.Timer.
Martin v. Löwis <martin@v.loewis.de>
parents: 19404
diff changeset
740 self.finished.set()
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
741
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
742 # 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
743 # This is garbage collected through an exit handler
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
744
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
745 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
746
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
747 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
748 Thread.__init__(self, name="MainThread")
45549
8dd30fe11a4b Merged revisions 61038,61042-61045,61047,61050,61053,61055-61056,61061-61062,61066,61068,61070,61083,61085,61092-61103 via svnmerge from
Christian Heimes <christian@cheimes.de>
parents: 45495
diff changeset
749 self._started.set()
52892
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
750 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
751 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
752 _active[self._ident] = self
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
753
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
754 def _set_daemon(self):
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22830
diff changeset
755 return False
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
756
40582
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
757 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
758 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
759 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
760 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
761 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
762 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
763 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
764 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
765 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
766 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
767 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
768 self._delete()
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
769
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
770 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
771 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
772 if not t.daemon and t.is_alive():
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
773 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
774 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
775
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
776
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
777 # 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
778 # These aren't garbage collected when they die, nor can they be waited for.
47615
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Benjamin Peterson <benjamin@python.org>
parents: 47555
diff changeset
779 # 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
780 # leave an entry in the _active dict forever after.
47615
045f83a1b864 Merged revisions 64125 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 47555
diff changeset
781 # 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
782 # 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
783 # 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
784
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
785 class _DummyThread(Thread):
15873
3dd217fbdd59 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15586
diff changeset
786
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
787 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
788 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
789
67355
a3b7c290754a Merged revisions 87740 via svnmerge from
Gregory P. Smith <greg@mad-scientist.com>
parents: 67340
diff changeset
790 # Thread._block consumes an OS-level locking primitive, which
34363
35f31790c6f9 threading._DummyThread.__init__(): document obscure new code.
Tim Peters <tim.peters@gmail.com>
parents: 34361
diff changeset
791 # 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
792 # 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
793 del self._block
34363
35f31790c6f9 threading._DummyThread.__init__(): document obscure new code.
Tim Peters <tim.peters@gmail.com>
parents: 34361
diff changeset
794
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Christian Heimes <christian@cheimes.de>
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diff changeset
795 self._started.set()
52892
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796 self._set_ident()
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797 with _active_limbo_lock:
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798 _active[self._ident] = self
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799
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diff changeset
800 def _set_daemon(self):
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diff changeset
801 return True
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802
21981
4e9cc26e03fd SF #515023. Make _DummyThread.join() signature match base class (Thread)
Neal Norwitz <nnorwitz@gmail.com>
parents: 21589
diff changeset
803 def join(self, timeout=None):
22867
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diff changeset
804 assert False, "cannot join a dummy thread"
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805
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diff changeset
806
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parents:
diff changeset
807 # Global API functions
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808
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diff changeset
809 def current_thread():
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diff changeset
810 try:
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diff changeset
811 return _active[_get_ident()]
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812 except KeyError:
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813 ##print "current_thread(): no current thread for", _get_ident()
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parents:
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814 return _DummyThread()
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815
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816 currentThread = current_thread
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817
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diff changeset
818 def active_count():
52892
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819 with _active_limbo_lock:
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Benjamin Peterson <benjamin@python.org>
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820 return len(_active) + len(_limbo)
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821
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822 activeCount = active_count
48757
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823
57121
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diff changeset
824 def _enumerate():
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Antoine Pitrou <solipsis@pitrou.net>
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diff changeset
825 # Same as enumerate(), but without the lock. Internal use only.
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Antoine Pitrou <solipsis@pitrou.net>
parents: 56894
diff changeset
826 return list(_active.values()) + list(_limbo.values())
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Antoine Pitrou <solipsis@pitrou.net>
parents: 56894
diff changeset
827
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parents:
diff changeset
828 def enumerate():
52892
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parents: 49058
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829 with _active_limbo_lock:
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830 return list(_active.values()) + list(_limbo.values())
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parents:
diff changeset
831
47266
7fe3a8648ce2 Rename thread to _thread and dummy_thread to _dummy_thread. Issue #2875.
Georg Brandl <georg@python.org>
parents: 46304
diff changeset
832 from _thread import stack_size
39442
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Thomas Wouters <thomas@python.org>
parents: 38453
diff changeset
833
40582
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Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
834 # Create the main thread object,
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
835 # and make it available for the interpreter
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Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
836 # (Py_Main) as threading._shutdown.
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837
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838 _shutdown = _MainThread()._exitfunc
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diff changeset
839
32673
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Jim Fulton <jim@zope.com>
parents: 32475
diff changeset
840 # get thread-local implementation, either from the thread
97768d87394a Implemented thread-local data as proposed on python-dev:
Jim Fulton <jim@zope.com>
parents: 32475
diff changeset
841 # module, or from the python fallback
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Jim Fulton <jim@zope.com>
parents: 32475
diff changeset
842
97768d87394a Implemented thread-local data as proposed on python-dev:
Jim Fulton <jim@zope.com>
parents: 32475
diff changeset
843 try:
47266
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Georg Brandl <georg@python.org>
parents: 46304
diff changeset
844 from _thread import _local as local
32673
97768d87394a Implemented thread-local data as proposed on python-dev:
Jim Fulton <jim@zope.com>
parents: 32475
diff changeset
845 except ImportError:
97768d87394a Implemented thread-local data as proposed on python-dev:
Jim Fulton <jim@zope.com>
parents: 32475
diff changeset
846 from _threading_local import local
97768d87394a Implemented thread-local data as proposed on python-dev:
Jim Fulton <jim@zope.com>
parents: 32475
diff changeset
847
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848
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849 def _after_fork():
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850 # This function is called by Python/ceval.c:PyEval_ReInitThreads which
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Jesse Noller <jnoller@gmail.com>
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diff changeset
851 # is called from PyOS_AfterFork. Here we cleanup threading module state
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parents: 47669
diff changeset
852 # that should not exist after a fork.
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853
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diff changeset
854 # Reset _active_limbo_lock, in case we forked while the lock was held
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parents: 47669
diff changeset
855 # by another (non-forked) thread. http://bugs.python.org/issue874900
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diff changeset
856 global _active_limbo_lock
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857 _active_limbo_lock = _allocate_lock()
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858
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859 # fork() only copied the current thread; clear references to others.
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860 new_active = {}
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861 current = current_thread()
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862 with _active_limbo_lock:
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863 for thread in _active.values():
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864 if thread is current:
49058
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865 # There is only one active thread. We reset the ident to
179f8d89ad19 Issue #874900: fix behaviour of threading module after a fork.
Antoine Pitrou <solipsis@pitrou.net>
parents: 48941
diff changeset
866 # its new value since it can have changed.
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Antoine Pitrou <solipsis@pitrou.net>
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diff changeset
867 ident = _get_ident()
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868 thread._ident = ident
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diff changeset
869 # Any condition variables hanging off of the active thread may
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diff changeset
870 # be in an invalid state, so we reinitialize them.
67355
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parents: 67340
diff changeset
871 thread._reset_internal_locks()
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872 new_active[ident] = thread
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873 else:
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874 # All the others are already stopped.
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875 # We don't call _Thread__stop() because it tries to acquire
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876 # thread._Thread__block which could also have been held while
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diff changeset
877 # we forked.
49058
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878 thread._stopped = True
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879
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880 _limbo.clear()
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881 _active.clear()
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882 _active.update(new_active)
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883 assert len(_active) == 1
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884
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885
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886 # Self-test code
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887
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888 def _test():
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diff changeset
889
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parents:
diff changeset
890 class BoundedQueue(_Verbose):
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parents:
diff changeset
891
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diff changeset
892 def __init__(self, limit):
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parents:
diff changeset
893 _Verbose.__init__(self)
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parents:
diff changeset
894 self.mon = RLock()
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parents:
diff changeset
895 self.rc = Condition(self.mon)
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Guido van Rossum <guido@python.org>
parents:
diff changeset
896 self.wc = Condition(self.mon)
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parents:
diff changeset
897 self.limit = limit
31436
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Raymond Hettinger <python@rcn.com>
parents: 30862
diff changeset
898 self.queue = deque()
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899
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parents:
diff changeset
900 def put(self, item):
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diff changeset
901 self.mon.acquire()
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parents:
diff changeset
902 while len(self.queue) >= self.limit:
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parents:
diff changeset
903 self._note("put(%s): queue full", item)
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parents:
diff changeset
904 self.wc.wait()
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905 self.queue.append(item)
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parents:
diff changeset
906 self._note("put(%s): appended, length now %d",
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Guido van Rossum <guido@python.org>
parents:
diff changeset
907 item, len(self.queue))
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parents:
diff changeset
908 self.rc.notify()
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diff changeset
909 self.mon.release()
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
910
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
911 def get(self):
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
912 self.mon.acquire()
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 not self.queue:
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
914 self._note("get(): queue empty")
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
915 self.rc.wait()
31436
63fa60f2d61c * Move collections.deque() in from the sandbox
Raymond Hettinger <python@rcn.com>
parents: 30862
diff changeset
916 item = self.queue.popleft()
7949
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
917 self._note("get(): got %s, %d left", item, len(self.queue))
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
918 self.wc.notify()
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
919 self.mon.release()
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
920 return item
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
921
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
922 class ProducerThread(Thread):
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
923
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
924 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
925 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
926 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
927 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
928
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
929 def run(self):
8394
93aa08c77e60 Use random instead of whrandom.
Guido van Rossum <guido@python.org>
parents: 7949
diff changeset
930 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
931 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
932 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
933 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
934 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
935 _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
936
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
937
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
938 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
939
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
940 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
941 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
942 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
943 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
944
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
945 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
946 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
947 item = self.queue.get()
40775
4cdf21a0dbbc Fix most trivially-findable print statements.
Guido van Rossum <guido@python.org>
parents: 40582
diff changeset
948 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
949 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
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 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
952 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
953 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
954
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
955 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
956 P = []
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
957 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
958 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
959 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
960 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
961 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
962 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
963 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
964 _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
965 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
966 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
967 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
968 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
969
58d6815af002 New Java-style threading module. The doc strings are in a separate module.
Guido van Rossum <guido@python.org>
parents:
diff changeset
970 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
971 _test()