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annotate Lib/_dummy_thread.py @ 66807:d28126ebd60d

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author Raymond Hettinger <python@rcn.com>
date Thu, 09 Dec 2010 16:41:54 +0000
parents 385d239bcbfa
children b82c3e593db6
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 class error(Exception):
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28 """Dummy implementation of _thread.error."""
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29
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30 def __init__(self, *args):
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31 self.args = args
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32
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33 def start_new_thread(function, args, kwargs={}):
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34 """Dummy implementation of _thread.start_new_thread().
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35
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36 Compatibility is maintained by making sure that ``args`` is a
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37 tuple and ``kwargs`` is a dictionary. If an exception is raised
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38 and it is SystemExit (which can be done by _thread.exit()) it is
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39 caught and nothing is done; all other exceptions are printed out
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40 by using traceback.print_exc().
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41
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42 If the executed function calls interrupt_main the KeyboardInterrupt will be
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43 raised when the function returns.
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44
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45 """
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46 if type(args) != type(tuple()):
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47 raise TypeError("2nd arg must be a tuple")
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48 if type(kwargs) != type(dict()):
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49 raise TypeError("3rd arg must be a dict")
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50 global _main
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51 _main = False
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52 try:
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53 function(*args, **kwargs)
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54 except SystemExit:
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55 pass
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56 except:
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57 import traceback
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58 traceback.print_exc()
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59 _main = True
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60 global _interrupt
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61 if _interrupt:
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62 _interrupt = False
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63 raise KeyboardInterrupt
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64
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65 def exit():
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66 """Dummy implementation of _thread.exit()."""
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67 raise SystemExit
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68
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69 def get_ident():
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70 """Dummy implementation of _thread.get_ident().
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71
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72 Since this module should only be used when _threadmodule is not
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73 available, it is safe to assume that the current process is the
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74 only thread. Thus a constant can be safely returned.
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75 """
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76 return -1
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77
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78 def allocate_lock():
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79 """Dummy implementation of _thread.allocate_lock()."""
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80 return LockType()
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81
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82 def stack_size(size=None):
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83 """Dummy implementation of _thread.stack_size()."""
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84 if size is not None:
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85 raise error("setting thread stack size not supported")
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86 return 0
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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