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annotate plugins/cherrypy/_cpthreadinglocal.py @ 109:5eac6e0308df alpha

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Traipse Alpha 'OpenRPG' {091007-03} Traipse is a distribution of OpenRPG that is designed to be easy to setup and go. Traipse also makes it easy for developers to work on code without fear of sacrifice. 'Ornery-Orc' continues the trend of 'Grumpy' and adds fixes to the code. 'Ornery-Orc's main goal is to offer more advanced features and enhance the productivity of the user. Update Summary: {091006} 00: Adds Bookmarks (Alpha) with cool Smiley Star and Plus Symbol images! 03: Changes made to the map for increased portability. SnowDog has changes planned in Core, though. Added an initial push to the BCG. Not much to see, just shows off how it is re-writing Main code. {091007} 00: New images added to Plugin Control Panel for Auto Start. 01: Attempting to fix Deprecation warning from Main. 02: Second attempt, problem in gsclient with "s. 03: Fail.
author sirebral
date Wed, 07 Oct 2009 21:02:28 -0500
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0
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1 # This is a backport of Python-2.4's threading.local() implementation
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2
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3 """Thread-local objects
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4
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5 (Note that this module provides a Python version of thread
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6 threading.local class. Depending on the version of Python you're
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7 using, there may be a faster one available. You should always import
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8 the local class from threading.)
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9
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10 Thread-local objects support the management of thread-local data.
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11 If you have data that you want to be local to a thread, simply create
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12 a thread-local object and use its attributes:
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13
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14 >>> mydata = local()
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15 >>> mydata.number = 42
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16 >>> mydata.number
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17 42
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18
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19 You can also access the local-object's dictionary:
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20
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21 >>> mydata.__dict__
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22 {'number': 42}
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23 >>> mydata.__dict__.setdefault('widgets', [])
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24 []
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25 >>> mydata.widgets
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26 []
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27
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28 What's important about thread-local objects is that their data are
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29 local to a thread. If we access the data in a different thread:
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30
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31 >>> log = []
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32 >>> def f():
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33 ... items = mydata.__dict__.items()
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34 ... items.sort()
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35 ... log.append(items)
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36 ... mydata.number = 11
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37 ... log.append(mydata.number)
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38
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39 >>> import threading
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40 >>> thread = threading.Thread(target=f)
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41 >>> thread.start()
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42 >>> thread.join()
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43 >>> log
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44 [[], 11]
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45
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46 we get different data. Furthermore, changes made in the other thread
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47 don't affect data seen in this thread:
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48
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49 >>> mydata.number
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50 42
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51
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52 Of course, values you get from a local object, including a __dict__
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53 attribute, are for whatever thread was current at the time the
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54 attribute was read. For that reason, you generally don't want to save
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55 these values across threads, as they apply only to the thread they
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56 came from.
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57
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58 You can create custom local objects by subclassing the local class:
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59
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60 >>> class MyLocal(local):
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61 ... number = 2
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62 ... initialized = False
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63 ... def __init__(self, **kw):
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64 ... if self.initialized:
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65 ... raise SystemError('__init__ called too many times')
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66 ... self.initialized = True
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67 ... self.__dict__.update(kw)
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68 ... def squared(self):
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69 ... return self.number ** 2
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70
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71 This can be useful to support default values, methods and
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72 initialization. Note that if you define an __init__ method, it will be
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73 called each time the local object is used in a separate thread. This
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74 is necessary to initialize each thread's dictionary.
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75
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76 Now if we create a local object:
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77
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78 >>> mydata = MyLocal(color='red')
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79
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80 Now we have a default number:
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81
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82 >>> mydata.number
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83 2
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84
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85 an initial color:
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86
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87 >>> mydata.color
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88 'red'
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89 >>> del mydata.color
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90
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91 And a method that operates on the data:
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92
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93 >>> mydata.squared()
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94 4
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95
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96 As before, we can access the data in a separate thread:
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97
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98 >>> log = []
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99 >>> thread = threading.Thread(target=f)
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100 >>> thread.start()
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101 >>> thread.join()
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102 >>> log
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103 [[('color', 'red'), ('initialized', True)], 11]
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104
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105 without affecting this thread's data:
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106
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107 >>> mydata.number
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108 2
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109 >>> mydata.color
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110 Traceback (most recent call last):
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111 ...
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112 AttributeError: 'MyLocal' object has no attribute 'color'
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113
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114 Note that subclasses can define slots, but they are not thread
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115 local. They are shared across threads:
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116
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117 >>> class MyLocal(local):
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118 ... __slots__ = 'number'
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119
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120 >>> mydata = MyLocal()
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121 >>> mydata.number = 42
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122 >>> mydata.color = 'red'
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123
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124 So, the separate thread:
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125
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126 >>> thread = threading.Thread(target=f)
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127 >>> thread.start()
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128 >>> thread.join()
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129
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130 affects what we see:
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131
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132 >>> mydata.number
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133 11
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134
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135 >>> del mydata
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136 """
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137
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138 # Threading import is at end
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139
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140 class _localbase(object):
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141 __slots__ = '_local__key', '_local__args', '_local__lock'
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142
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143 def __new__(cls, *args, **kw):
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144 self = object.__new__(cls)
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145 key = '_local__key', 'thread.local.' + str(id(self))
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146 object.__setattr__(self, '_local__key', key)
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147 object.__setattr__(self, '_local__args', (args, kw))
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148 object.__setattr__(self, '_local__lock', RLock())
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149
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150 if args or kw and (cls.__init__ is object.__init__):
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151 raise TypeError("Initialization arguments are not supported")
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152
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153 # We need to create the thread dict in anticipation of
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154 # __init__ being called, to make sire we don't cal it
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155 # again ourselves.
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156 dict = object.__getattribute__(self, '__dict__')
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157 currentThread().__dict__[key] = dict
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158
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159 return self
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160
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161 def _patch(self):
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162 key = object.__getattribute__(self, '_local__key')
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163 d = currentThread().__dict__.get(key)
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164 if d is None:
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165 d = {}
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166 currentThread().__dict__[key] = d
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167 object.__setattr__(self, '__dict__', d)
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168
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169 # we have a new instance dict, so call out __init__ if we have
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170 # one
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171 cls = type(self)
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172 if cls.__init__ is not object.__init__:
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173 args, kw = object.__getattribute__(self, '_local__args')
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174 cls.__init__(self, *args, **kw)
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175 else:
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176 object.__setattr__(self, '__dict__', d)
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177
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178 class local(_localbase):
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179
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180 def __getattribute__(self, name):
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181 lock = object.__getattribute__(self, '_local__lock')
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182 lock.acquire()
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183 try:
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184 _patch(self)
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185 return object.__getattribute__(self, name)
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186 finally:
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187 lock.release()
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188
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189 def __setattr__(self, name, value):
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190 lock = object.__getattribute__(self, '_local__lock')
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191 lock.acquire()
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192 try:
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193 _patch(self)
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194 return object.__setattr__(self, name, value)
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195 finally:
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196 lock.release()
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197
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198 def __delattr__(self, name):
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199 lock = object.__getattribute__(self, '_local__lock')
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200 lock.acquire()
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201 try:
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202 _patch(self)
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203 return object.__delattr__(self, name)
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204 finally:
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205 lock.release()
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206
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207
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208 def __del__():
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209 threading_enumerate = enumerate
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210 __getattribute__ = object.__getattribute__
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211
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212 def __del__(self):
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213 key = __getattribute__(self, '_local__key')
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214
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215 try:
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216 threads = list(threading_enumerate())
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217 except:
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218 # if enumerate fails, as it seems to do during
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219 # shutdown, we'll skip cleanup under the assumption
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220 # that there is nothing to clean up
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221 return
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222
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223 for thread in threads:
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224 try:
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225 __dict__ = thread.__dict__
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226 except AttributeError:
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227 # Thread is dying, rest in peace
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228 continue
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229
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230 if key in __dict__:
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231 try:
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232 del __dict__[key]
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233 except KeyError:
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234 pass # didn't have anything in this thread
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235
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236 return __del__
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237 __del__ = __del__()
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238
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239 from threading import currentThread, enumerate, RLock