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annotate plugins/cherrypy/_cpthreadinglocal.py @ 23:551cd440acce traipse_dev

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Final Dev build of the Day. Should reduce RAM usage more.
author sirebral
date Sat, 25 Jul 2009 21:05:18 -0500
parents 4385a7d0efd1
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rev   line source
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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