Mercurial > cpython-lru_cache-weakref

annotate Lib/_dummy_thread.py @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents d52b68edbca6
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """Drop-in replacement for the thread module.
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2
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3 Meant to be used as a brain-dead substitute so that threaded code does
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4 not need to be rewritten for when the thread module is not present.
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5
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6 Suggested usage is::
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7
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8 try:
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9 import _thread
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10 except ImportError:
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11 import _dummy_thread as _thread
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12
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13 """
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14 # Exports only things specified by thread documentation;
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15 # skipping obsolete synonyms allocate(), start_new(), exit_thread().
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16 __all__ = ['error', 'start_new_thread', 'exit', 'get_ident', 'allocate_lock',
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17 'interrupt_main', 'LockType']
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18
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19 # A dummy value
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20 TIMEOUT_MAX = 2**31
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21
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22 # NOTE: this module can be imported early in the extension building process,
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23 # and so top level imports of other modules should be avoided. Instead, all
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24 # imports are done when needed on a function-by-function basis. Since threads
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25 # are disabled, the import lock should not be an issue anyway (??).
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26
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27 error = RuntimeError
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28
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29 def start_new_thread(function, args, kwargs={}):
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30 """Dummy implementation of _thread.start_new_thread().
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31
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32 Compatibility is maintained by making sure that ``args`` is a
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33 tuple and ``kwargs`` is a dictionary. If an exception is raised
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34 and it is SystemExit (which can be done by _thread.exit()) it is
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35 caught and nothing is done; all other exceptions are printed out
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36 by using traceback.print_exc().
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37
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38 If the executed function calls interrupt_main the KeyboardInterrupt will be
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39 raised when the function returns.
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40
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41 """
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42 if type(args) != type(tuple()):
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43 raise TypeError("2nd arg must be a tuple")
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44 if type(kwargs) != type(dict()):
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45 raise TypeError("3rd arg must be a dict")
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46 global _main
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47 _main = False
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48 try:
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49 function(*args, **kwargs)
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50 except SystemExit:
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51 pass
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52 except:
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53 import traceback
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54 traceback.print_exc()
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55 _main = True
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56 global _interrupt
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57 if _interrupt:
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58 _interrupt = False
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59 raise KeyboardInterrupt
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60
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61 def exit():
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62 """Dummy implementation of _thread.exit()."""
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63 raise SystemExit
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64
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65 def get_ident():
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66 """Dummy implementation of _thread.get_ident().
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67
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68 Since this module should only be used when _threadmodule is not
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69 available, it is safe to assume that the current process is the
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70 only thread. Thus a constant can be safely returned.
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71 """
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72 return -1
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73
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74 def allocate_lock():
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75 """Dummy implementation of _thread.allocate_lock()."""
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76 return LockType()
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77
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78 def stack_size(size=None):
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79 """Dummy implementation of _thread.stack_size()."""
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80 if size is not None:
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81 raise error("setting thread stack size not supported")
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82 return 0
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83
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84 def _set_sentinel():
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85 """Dummy implementation of _thread._set_sentinel()."""
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86 return LockType()
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87
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88 class LockType(object):
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89 """Class implementing dummy implementation of _thread.LockType.
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90
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91 Compatibility is maintained by maintaining self.locked_status
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92 which is a boolean that stores the state of the lock. Pickling of
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93 the lock, though, should not be done since if the _thread module is
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94 then used with an unpickled ``lock()`` from here problems could
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95 occur from this class not having atomic methods.
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96
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97 """
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98
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99 def __init__(self):
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100 self.locked_status = False
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101
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102 def acquire(self, waitflag=None, timeout=-1):
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103 """Dummy implementation of acquire().
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104
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105 For blocking calls, self.locked_status is automatically set to
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106 True and returned appropriately based on value of
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107 ``waitflag``. If it is non-blocking, then the value is
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108 actually checked and not set if it is already acquired. This
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109 is all done so that threading.Condition's assert statements
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110 aren't triggered and throw a little fit.
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111
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112 """
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113 if waitflag is None or waitflag:
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114 self.locked_status = True
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115 return True
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116 else:
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117 if not self.locked_status:
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118 self.locked_status = True
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119 return True
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120 else:
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121 if timeout > 0:
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122 import time
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123 time.sleep(timeout)
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124 return False
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125
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126 __enter__ = acquire
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127
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128 def __exit__(self, typ, val, tb):
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129 self.release()
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130
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131 def release(self):
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132 """Release the dummy lock."""
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133 # XXX Perhaps shouldn't actually bother to test? Could lead
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134 # to problems for complex, threaded code.
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135 if not self.locked_status:
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136 raise error
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137 self.locked_status = False
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138 return True
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139
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140 def locked(self):
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141 return self.locked_status
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142
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143 # Used to signal that interrupt_main was called in a "thread"
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144 _interrupt = False
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145 # True when not executing in a "thread"
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146 _main = True
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147
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148 def interrupt_main():
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149 """Set _interrupt flag to True to have start_new_thread raise
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150 KeyboardInterrupt upon exiting."""
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151 if _main:
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152 raise KeyboardInterrupt
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153 else:
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154 global _interrupt
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155 _interrupt = True