Mercurial > cpython-lru_cache-weakref

annotate Lib/multiprocessing/process.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents da5b370f41a1
children 0fa82a06194c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #
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2 # Module providing the `Process` class which emulates `threading.Thread`
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3 #
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4 # multiprocessing/process.py
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5 #
66887
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6 # Copyright (c) 2006-2008, R Oudkerk
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7 # All rights reserved.
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8 #
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9 # Redistribution and use in source and binary forms, with or without
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10 # modification, are permitted provided that the following conditions
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11 # are met:
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12 #
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13 # 1. Redistributions of source code must retain the above copyright
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14 # notice, this list of conditions and the following disclaimer.
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15 # 2. Redistributions in binary form must reproduce the above copyright
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16 # notice, this list of conditions and the following disclaimer in the
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17 # documentation and/or other materials provided with the distribution.
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18 # 3. Neither the name of author nor the names of any contributors may be
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19 # used to endorse or promote products derived from this software
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20 # without specific prior written permission.
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21 #
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22 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
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23 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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24 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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25 # ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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26 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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27 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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28 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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29 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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30 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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31 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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32 # SUCH DAMAGE.
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33 #
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34
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35 __all__ = ['Process', 'current_process', 'active_children']
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36
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37 #
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38 # Imports
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39 #
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40
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41 import os
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42 import sys
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43 import signal
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44 import itertools
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45
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46 #
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47 #
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48 #
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49
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50 try:
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51 ORIGINAL_DIR = os.path.abspath(os.getcwd())
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52 except OSError:
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53 ORIGINAL_DIR = None
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54
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55 #
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56 # Public functions
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57 #
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58
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59 def current_process():
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60 '''
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61 Return process object representing the current process
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62 '''
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63 return _current_process
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64
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65 def active_children():
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66 '''
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67 Return list of process objects corresponding to live child processes
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68 '''
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69 _cleanup()
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70 return list(_current_process._children)
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71
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72 #
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73 #
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74 #
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75
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76 def _cleanup():
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77 # check for processes which have finished
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78 for p in list(_current_process._children):
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79 if p._popen.poll() is not None:
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80 _current_process._children.discard(p)
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81
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82 #
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83 # The `Process` class
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84 #
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85
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86 class Process(object):
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87 '''
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88 Process objects represent activity that is run in a separate process
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89
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90 The class is analagous to `threading.Thread`
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91 '''
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92 _Popen = None
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93
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94 def __init__(self, group=None, target=None, name=None, args=(), kwargs={}):
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95 assert group is None, 'group argument must be None for now'
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96 count = _current_process._counter.next()
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97 self._identity = _current_process._identity + (count,)
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98 self._authkey = _current_process._authkey
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99 self._daemonic = _current_process._daemonic
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100 self._tempdir = _current_process._tempdir
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101 self._parent_pid = os.getpid()
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102 self._popen = None
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103 self._target = target
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104 self._args = tuple(args)
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105 self._kwargs = dict(kwargs)
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106 self._name = name or type(self).__name__ + '-' + \
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107 ':'.join(str(i) for i in self._identity)
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108
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109 def run(self):
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110 '''
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111 Method to be run in sub-process; can be overridden in sub-class
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112 '''
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113 if self._target:
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114 self._target(*self._args, **self._kwargs)
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115
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116 def start(self):
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117 '''
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118 Start child process
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119 '''
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120 assert self._popen is None, 'cannot start a process twice'
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121 assert self._parent_pid == os.getpid(), \
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122 'can only start a process object created by current process'
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123 assert not _current_process._daemonic, \
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124 'daemonic processes are not allowed to have children'
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125 _cleanup()
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126 if self._Popen is not None:
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127 Popen = self._Popen
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128 else:
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129 from .forking import Popen
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130 self._popen = Popen(self)
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131 _current_process._children.add(self)
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132
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133 def terminate(self):
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134 '''
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135 Terminate process; sends SIGTERM signal or uses TerminateProcess()
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136 '''
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137 self._popen.terminate()
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138
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139 def join(self, timeout=None):
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140 '''
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141 Wait until child process terminates
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142 '''
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143 assert self._parent_pid == os.getpid(), 'can only join a child process'
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144 assert self._popen is not None, 'can only join a started process'
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145 res = self._popen.wait(timeout)
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146 if res is not None:
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147 _current_process._children.discard(self)
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148
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149 def is_alive(self):
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150 '''
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151 Return whether process is alive
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152 '''
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153 if self is _current_process:
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154 return True
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155 assert self._parent_pid == os.getpid(), 'can only test a child process'
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156 if self._popen is None:
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157 return False
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158 self._popen.poll()
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159 return self._popen.returncode is None
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160
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161 @property
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162 def name(self):
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163 return self._name
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164
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165 @name.setter
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166 def name(self, name):
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167 assert isinstance(name, basestring), 'name must be a string'
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168 self._name = name
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169
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170 @property
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171 def daemon(self):
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172 '''
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173 Return whether process is a daemon
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174 '''
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175 return self._daemonic
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176
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177 @daemon.setter
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178 def daemon(self, daemonic):
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179 '''
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180 Set whether process is a daemon
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181 '''
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182 assert self._popen is None, 'process has already started'
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183 self._daemonic = daemonic
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184
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185 @property
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186 def authkey(self):
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187 return self._authkey
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188
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189 @authkey.setter
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190 def authkey(self, authkey):
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191 '''
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192 Set authorization key of process
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193 '''
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194 self._authkey = AuthenticationString(authkey)
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195
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196 @property
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197 def exitcode(self):
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198 '''
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199 Return exit code of process or `None` if it has yet to stop
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200 '''
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201 if self._popen is None:
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202 return self._popen
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203 return self._popen.poll()
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204
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205 @property
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206 def ident(self):
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207 '''
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208 Return identifier (PID) of process or `None` if it has yet to start
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209 '''
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210 if self is _current_process:
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211 return os.getpid()
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212 else:
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213 return self._popen and self._popen.pid
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214
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215 pid = ident
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216
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217 def __repr__(self):
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218 if self is _current_process:
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219 status = 'started'
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220 elif self._parent_pid != os.getpid():
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221 status = 'unknown'
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222 elif self._popen is None:
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223 status = 'initial'
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224 else:
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225 if self._popen.poll() is not None:
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226 status = self.exitcode
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227 else:
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228 status = 'started'
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229
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230 if type(status) is int:
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231 if status == 0:
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232 status = 'stopped'
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233 else:
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234 status = 'stopped[%s]' % _exitcode_to_name.get(status, status)
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235
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236 return '<%s(%s, %s%s)>' % (type(self).__name__, self._name,
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237 status, self._daemonic and ' daemon' or '')
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238
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239 ##
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240
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241 def _bootstrap(self):
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242 from . import util
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243 global _current_process
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244
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245 try:
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246 self._children = set()
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247 self._counter = itertools.count(1)
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248 try:
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249 sys.stdin.close()
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250 sys.stdin = open(os.devnull)
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251 except (OSError, ValueError):
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252 pass
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253 _current_process = self
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254 util._finalizer_registry.clear()
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255 util._run_after_forkers()
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256 util.info('child process calling self.run()')
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257 try:
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258 self.run()
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259 exitcode = 0
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diff changeset
260 finally:
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261 util._exit_function()
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diff changeset
262 except SystemExit, e:
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263 if not e.args:
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264 exitcode = 1
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265 elif isinstance(e.args[0], int):
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266 exitcode = e.args[0]
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267 else:
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268 sys.stderr.write(str(e.args[0]) + '\n')
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269 sys.stderr.flush()
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270 exitcode = 0 if isinstance(e.args[0], str) else 1
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diff changeset
271 except:
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272 exitcode = 1
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273 import traceback
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274 sys.stderr.write('Process %s:\n' % self.name)
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275 sys.stderr.flush()
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diff changeset
276 traceback.print_exc()
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277
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278 util.info('process exiting with exitcode %d' % exitcode)
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279 return exitcode
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280
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281 #
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282 # We subclass bytes to avoid accidental transmission of auth keys over network
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283 #
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284
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285 class AuthenticationString(bytes):
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286 def __reduce__(self):
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287 from .forking import Popen
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288 if not Popen.thread_is_spawning():
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289 raise TypeError(
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290 'Pickling an AuthenticationString object is '
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291 'disallowed for security reasons'
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292 )
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293 return AuthenticationString, (bytes(self),)
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294
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295 #
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296 # Create object representing the main process
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297 #
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298
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299 class _MainProcess(Process):
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300
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301 def __init__(self):
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302 self._identity = ()
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303 self._daemonic = False
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304 self._name = 'MainProcess'
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305 self._parent_pid = None
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306 self._popen = None
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307 self._counter = itertools.count(1)
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308 self._children = set()
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309 self._authkey = AuthenticationString(os.urandom(32))
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310 self._tempdir = None
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311
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312 _current_process = _MainProcess()
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313 del _MainProcess
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314
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315 #
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316 # Give names to some return codes
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317 #
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318
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319 _exitcode_to_name = {}
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320
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321 for name, signum in signal.__dict__.items():
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322 if name[:3]=='SIG' and '_' not in name:
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323 _exitcode_to_name[-signum] = name