Mercurial > cpython-lru_cache-weakref

annotate Lib/multiprocessing/util.py @ 58925:eecf1bef052d 2.6

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Merged revisions 78207 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r78207 | ezio.melotti | 2010-02-17 01:26:09 +0200 (Wed, 17 Feb 2010) | 1 line #7930: fix stripid ........
author Ezio Melotti <ezio.melotti@gmail.com>
date Tue, 16 Feb 2010 23:29:44 +0000
parents 05f90cecb2a2
children 9ac8699d88d6
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1 #
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2 # Module providing various facilities to other parts of the package
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3 #
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4 # multiprocessing/util.py
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5 #
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6 # Copyright (c) 2006-2008, R Oudkerk --- see COPYING.txt
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7 #
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8
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9 import itertools
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10 import weakref
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11 import atexit
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12 import threading # we want threading to install it's
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13 # cleanup function before multiprocessing does
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14
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15 from multiprocessing.process import current_process, active_children
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16
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17 __all__ = [
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18 'sub_debug', 'debug', 'info', 'sub_warning', 'get_logger',
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19 'log_to_stderr', 'get_temp_dir', 'register_after_fork',
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20 'is_exiting', 'Finalize', 'ForkAwareThreadLock', 'ForkAwareLocal',
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21 'SUBDEBUG', 'SUBWARNING',
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22 ]
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23
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24 #
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25 # Logging
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26 #
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27
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28 NOTSET = 0
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29 SUBDEBUG = 5
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30 DEBUG = 10
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31 INFO = 20
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32 SUBWARNING = 25
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33
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34 LOGGER_NAME = 'multiprocessing'
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35 DEFAULT_LOGGING_FORMAT = '[%(levelname)s/%(processName)s] %(message)s'
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36
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37 _logger = None
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38 _log_to_stderr = False
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39
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40 def sub_debug(msg, *args):
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41 if _logger:
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42 _logger.log(SUBDEBUG, msg, *args)
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43
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44 def debug(msg, *args):
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45 if _logger:
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46 _logger.log(DEBUG, msg, *args)
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47
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48 def info(msg, *args):
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49 if _logger:
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50 _logger.log(INFO, msg, *args)
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51
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52 def sub_warning(msg, *args):
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53 if _logger:
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54 _logger.log(SUBWARNING, msg, *args)
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55
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56 def get_logger():
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57 '''
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58 Returns logger used by multiprocessing
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59 '''
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60 global _logger
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61 import logging, atexit
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62
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63 logging._acquireLock()
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64 try:
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65 if not _logger:
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66
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67 _logger = logging.getLogger(LOGGER_NAME)
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68 _logger.propagate = 0
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69 logging.addLevelName(SUBDEBUG, 'SUBDEBUG')
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70 logging.addLevelName(SUBWARNING, 'SUBWARNING')
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71
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72 # XXX multiprocessing should cleanup before logging
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73 if hasattr(atexit, 'unregister'):
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74 atexit.unregister(_exit_function)
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75 atexit.register(_exit_function)
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76 else:
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77 atexit._exithandlers.remove((_exit_function, (), {}))
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78 atexit._exithandlers.append((_exit_function, (), {}))
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79
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80 finally:
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81 logging._releaseLock()
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82
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83 return _logger
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84
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85 def log_to_stderr(level=None):
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86 '''
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87 Turn on logging and add a handler which prints to stderr
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88 '''
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89 global _log_to_stderr
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90 import logging
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91
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92 logger = get_logger()
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93 formatter = logging.Formatter(DEFAULT_LOGGING_FORMAT)
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94 handler = logging.StreamHandler()
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95 handler.setFormatter(formatter)
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96 logger.addHandler(handler)
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97
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98 if level:
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99 logger.setLevel(level)
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100 _log_to_stderr = True
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101 return _logger
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102
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103 #
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104 # Function returning a temp directory which will be removed on exit
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105 #
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106
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107 def get_temp_dir():
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108 # get name of a temp directory which will be automatically cleaned up
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109 if current_process()._tempdir is None:
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110 import shutil, tempfile
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111 tempdir = tempfile.mkdtemp(prefix='pymp-')
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112 info('created temp directory %s', tempdir)
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113 Finalize(None, shutil.rmtree, args=[tempdir], exitpriority=-100)
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114 current_process()._tempdir = tempdir
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115 return current_process()._tempdir
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116
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117 #
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118 # Support for reinitialization of objects when bootstrapping a child process
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119 #
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120
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121 _afterfork_registry = weakref.WeakValueDictionary()
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122 _afterfork_counter = itertools.count()
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123
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124 def _run_after_forkers():
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125 items = list(_afterfork_registry.items())
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126 items.sort()
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127 for (index, ident, func), obj in items:
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128 try:
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129 func(obj)
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130 except Exception, e:
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131 info('after forker raised exception %s', e)
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132
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133 def register_after_fork(obj, func):
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134 _afterfork_registry[(_afterfork_counter.next(), id(obj), func)] = obj
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135
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136 #
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137 # Finalization using weakrefs
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138 #
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139
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140 _finalizer_registry = {}
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141 _finalizer_counter = itertools.count()
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diff changeset
142
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Benjamin Peterson <benjamin@python.org>
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diff changeset
143
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Benjamin Peterson <benjamin@python.org>
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diff changeset
144 class Finalize(object):
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diff changeset
145 '''
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parents: 47694
diff changeset
146 Class which supports object finalization using weakrefs
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diff changeset
147 '''
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diff changeset
148 def __init__(self, obj, callback, args=(), kwargs=None, exitpriority=None):
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diff changeset
149 assert exitpriority is None or type(exitpriority) is int
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diff changeset
150
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
151 if obj is not None:
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diff changeset
152 self._weakref = weakref.ref(obj, self)
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diff changeset
153 else:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
154 assert exitpriority is not None
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Benjamin Peterson <benjamin@python.org>
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diff changeset
155
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Benjamin Peterson <benjamin@python.org>
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diff changeset
156 self._callback = callback
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diff changeset
157 self._args = args
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
158 self._kwargs = kwargs or {}
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parents: 47694
diff changeset
159 self._key = (exitpriority, _finalizer_counter.next())
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diff changeset
160
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Benjamin Peterson <benjamin@python.org>
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diff changeset
161 _finalizer_registry[self._key] = self
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diff changeset
162
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Benjamin Peterson <benjamin@python.org>
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diff changeset
163 def __call__(self, wr=None):
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Benjamin Peterson <benjamin@python.org>
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164 '''
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
165 Run the callback unless it has already been called or cancelled
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Benjamin Peterson <benjamin@python.org>
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diff changeset
166 '''
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
167 try:
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Benjamin Peterson <benjamin@python.org>
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diff changeset
168 del _finalizer_registry[self._key]
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Benjamin Peterson <benjamin@python.org>
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diff changeset
169 except KeyError:
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Benjamin Peterson <benjamin@python.org>
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diff changeset
170 sub_debug('finalizer no longer registered')
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diff changeset
171 else:
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diff changeset
172 sub_debug('finalizer calling %s with args %s and kwargs %s',
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diff changeset
173 self._callback, self._args, self._kwargs)
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174 res = self._callback(*self._args, **self._kwargs)
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diff changeset
175 self._weakref = self._callback = self._args = \
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176 self._kwargs = self._key = None
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diff changeset
177 return res
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178
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diff changeset
179 def cancel(self):
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180 '''
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Benjamin Peterson <benjamin@python.org>
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181 Cancel finalization of the object
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diff changeset
182 '''
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
183 try:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
184 del _finalizer_registry[self._key]
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diff changeset
185 except KeyError:
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Benjamin Peterson <benjamin@python.org>
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diff changeset
186 pass
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diff changeset
187 else:
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diff changeset
188 self._weakref = self._callback = self._args = \
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diff changeset
189 self._kwargs = self._key = None
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diff changeset
190
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diff changeset
191 def still_active(self):
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diff changeset
192 '''
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diff changeset
193 Return whether this finalizer is still waiting to invoke callback
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diff changeset
194 '''
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
195 return self._key in _finalizer_registry
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diff changeset
196
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Benjamin Peterson <benjamin@python.org>
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diff changeset
197 def __repr__(self):
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diff changeset
198 try:
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diff changeset
199 obj = self._weakref()
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Benjamin Peterson <benjamin@python.org>
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diff changeset
200 except (AttributeError, TypeError):
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diff changeset
201 obj = None
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diff changeset
202
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Benjamin Peterson <benjamin@python.org>
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diff changeset
203 if obj is None:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
204 return '<Finalize object, dead>'
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Benjamin Peterson <benjamin@python.org>
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diff changeset
205
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
206 x = '<Finalize object, callback=%s' % \
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diff changeset
207 getattr(self._callback, '__name__', self._callback)
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diff changeset
208 if self._args:
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diff changeset
209 x += ', args=' + str(self._args)
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Benjamin Peterson <benjamin@python.org>
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diff changeset
210 if self._kwargs:
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Benjamin Peterson <benjamin@python.org>
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diff changeset
211 x += ', kwargs=' + str(self._kwargs)
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Benjamin Peterson <benjamin@python.org>
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diff changeset
212 if self._key[0] is not None:
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diff changeset
213 x += ', exitprority=' + str(self._key[0])
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diff changeset
214 return x + '>'
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diff changeset
215
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Benjamin Peterson <benjamin@python.org>
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diff changeset
216
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Benjamin Peterson <benjamin@python.org>
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diff changeset
217 def _run_finalizers(minpriority=None):
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diff changeset
218 '''
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Benjamin Peterson <benjamin@python.org>
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diff changeset
219 Run all finalizers whose exit priority is not None and at least minpriority
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Benjamin Peterson <benjamin@python.org>
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diff changeset
220
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
221 Finalizers with highest priority are called first; finalizers with
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
222 the same priority will be called in reverse order of creation.
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Benjamin Peterson <benjamin@python.org>
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diff changeset
223 '''
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
224 if minpriority is None:
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Benjamin Peterson <benjamin@python.org>
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diff changeset
225 f = lambda p : p[0][0] is not None
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Benjamin Peterson <benjamin@python.org>
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diff changeset
226 else:
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diff changeset
227 f = lambda p : p[0][0] is not None and p[0][0] >= minpriority
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diff changeset
228
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diff changeset
229 items = [x for x in _finalizer_registry.items() if f(x)]
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diff changeset
230 items.sort(reverse=True)
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parents: 47694
diff changeset
231
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Benjamin Peterson <benjamin@python.org>
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diff changeset
232 for key, finalizer in items:
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diff changeset
233 sub_debug('calling %s', finalizer)
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Benjamin Peterson <benjamin@python.org>
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diff changeset
234 try:
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Benjamin Peterson <benjamin@python.org>
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diff changeset
235 finalizer()
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Benjamin Peterson <benjamin@python.org>
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diff changeset
236 except Exception:
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Benjamin Peterson <benjamin@python.org>
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diff changeset
237 import traceback
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Benjamin Peterson <benjamin@python.org>
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diff changeset
238 traceback.print_exc()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
239
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Benjamin Peterson <benjamin@python.org>
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diff changeset
240 if minpriority is None:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
241 _finalizer_registry.clear()
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diff changeset
242
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
243 #
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Benjamin Peterson <benjamin@python.org>
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diff changeset
244 # Clean up on exit
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diff changeset
245 #
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diff changeset
246
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Benjamin Peterson <benjamin@python.org>
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diff changeset
247 def is_exiting():
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diff changeset
248 '''
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Benjamin Peterson <benjamin@python.org>
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diff changeset
249 Returns true if the process is shutting down
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diff changeset
250 '''
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Benjamin Peterson <benjamin@python.org>
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diff changeset
251 return _exiting or _exiting is None
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diff changeset
252
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diff changeset
253 _exiting = False
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diff changeset
254
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Benjamin Peterson <benjamin@python.org>
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diff changeset
255 def _exit_function():
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diff changeset
256 global _exiting
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diff changeset
257
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
258 info('process shutting down')
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
259 debug('running all "atexit" finalizers with priority >= 0')
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
260 _run_finalizers(0)
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parents: 47694
diff changeset
261
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
262 for p in active_children():
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
263 if p._daemonic:
48302
7ea805d879e1 issue3352: clean up the multiprocessing API to remove many get_/set_ methods and convert them to properties. Update the docs and the examples included.
Jesse Noller <jnoller@gmail.com>
parents: 47980
diff changeset
264 info('calling terminate() for daemon %s', p.name)
47696
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diff changeset
265 p._popen.terminate()
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diff changeset
266
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
267 for p in active_children():
48302
7ea805d879e1 issue3352: clean up the multiprocessing API to remove many get_/set_ methods and convert them to properties. Update the docs and the examples included.
Jesse Noller <jnoller@gmail.com>
parents: 47980
diff changeset
268 info('calling join() for process %s', p.name)
47696
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diff changeset
269 p.join()
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parents: 47694
diff changeset
270
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
271 debug('running the remaining "atexit" finalizers')
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
272 _run_finalizers()
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Benjamin Peterson <benjamin@python.org>
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diff changeset
273
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
274 atexit.register(_exit_function)
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diff changeset
275
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parents: 47694
diff changeset
276 #
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Benjamin Peterson <benjamin@python.org>
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diff changeset
277 # Some fork aware types
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diff changeset
278 #
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diff changeset
279
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diff changeset
280 class ForkAwareThreadLock(object):
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diff changeset
281 def __init__(self):
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diff changeset
282 self._lock = threading.Lock()
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diff changeset
283 self.acquire = self._lock.acquire
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Benjamin Peterson <benjamin@python.org>
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diff changeset
284 self.release = self._lock.release
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diff changeset
285 register_after_fork(self, ForkAwareThreadLock.__init__)
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parents: 47694
diff changeset
286
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Benjamin Peterson <benjamin@python.org>
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diff changeset
287 class ForkAwareLocal(threading.local):
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parents: 47694
diff changeset
288 def __init__(self):
d01165fae98e darn! I converted half of the files the wrong way.
Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
289 register_after_fork(self, lambda obj : obj.__dict__.clear())
d01165fae98e darn! I converted half of the files the wrong way.
Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
290 def __reduce__(self):
d01165fae98e darn! I converted half of the files the wrong way.
Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
291 return type(self), ()