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annotate Lib/dummy_thread.py @ 58765:2ba7677bfa95 legacy-trunk

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testCopysign was defined twice in test_math; combine the definitions
author Mark Dickinson <dickinsm@gmail.com>
date Sat, 06 Feb 2010 23:11:25 +0000
parents 75658543b919
children 787b969d37f0
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 import traceback as _traceback
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20
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21 class error(Exception):
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22 """Dummy implementation of thread.error."""
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23
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24 def __init__(self, *args):
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25 self.args = args
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26
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27 def start_new_thread(function, args, kwargs={}):
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28 """Dummy implementation of thread.start_new_thread().
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29
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30 Compatibility is maintained by making sure that ``args`` is a
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31 tuple and ``kwargs`` is a dictionary. If an exception is raised
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32 and it is SystemExit (which can be done by thread.exit()) it is
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33 caught and nothing is done; all other exceptions are printed out
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34 by using traceback.print_exc().
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35
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36 If the executed function calls interrupt_main the KeyboardInterrupt will be
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37 raised when the function returns.
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38
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39 """
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40 if type(args) != type(tuple()):
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41 raise TypeError("2nd arg must be a tuple")
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42 if type(kwargs) != type(dict()):
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43 raise TypeError("3rd arg must be a dict")
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44 global _main
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45 _main = False
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46 try:
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47 function(*args, **kwargs)
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48 except SystemExit:
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49 pass
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50 except:
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51 _traceback.print_exc()
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52 _main = True
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53 global _interrupt
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54 if _interrupt:
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55 _interrupt = False
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56 raise KeyboardInterrupt
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57
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58 def exit():
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59 """Dummy implementation of thread.exit()."""
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60 raise SystemExit
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61
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62 def get_ident():
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63 """Dummy implementation of thread.get_ident().
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64
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65 Since this module should only be used when threadmodule is not
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66 available, it is safe to assume that the current process is the
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67 only thread. Thus a constant can be safely returned.
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68 """
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69 return -1
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70
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71 def allocate_lock():
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72 """Dummy implementation of thread.allocate_lock()."""
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73 return LockType()
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74
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75 def stack_size(size=None):
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76 """Dummy implementation of thread.stack_size()."""
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77 if size is not None:
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78 raise error("setting thread stack size not supported")
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79 return 0
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80
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81 class LockType(object):
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82 """Class implementing dummy implementation of thread.LockType.
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83
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84 Compatibility is maintained by maintaining self.locked_status
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85 which is a boolean that stores the state of the lock. Pickling of
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86 the lock, though, should not be done since if the thread module is
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87 then used with an unpickled ``lock()`` from here problems could
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88 occur from this class not having atomic methods.
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89
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90 """
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91
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92 def __init__(self):
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93 self.locked_status = False
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94
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95 def acquire(self, waitflag=None):
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96 """Dummy implementation of acquire().
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97
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98 For blocking calls, self.locked_status is automatically set to
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99 True and returned appropriately based on value of
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100 ``waitflag``. If it is non-blocking, then the value is
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101 actually checked and not set if it is already acquired. This
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102 is all done so that threading.Condition's assert statements
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103 aren't triggered and throw a little fit.
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104
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105 """
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106 if waitflag is None or waitflag:
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107 self.locked_status = True
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108 return True
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109 else:
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110 if not self.locked_status:
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111 self.locked_status = True
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112 return True
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113 else:
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114 return False
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115
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116 __enter__ = acquire
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117
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118 def __exit__(self, typ, val, tb):
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119 self.release()
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120
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121 def release(self):
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122 """Release the dummy lock."""
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123 # XXX Perhaps shouldn't actually bother to test? Could lead
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124 # to problems for complex, threaded code.
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125 if not self.locked_status:
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126 raise error
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127 self.locked_status = False
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128 return True
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129
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130 def locked(self):
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131 return self.locked_status
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132
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133 # Used to signal that interrupt_main was called in a "thread"
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134 _interrupt = False
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135 # True when not executing in a "thread"
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136 _main = True
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parents: 27507
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137
e9953b399d55 dummy_thread modified to have interrupt_main and to behave appropriately when
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138 def interrupt_main():
e9953b399d55 dummy_thread modified to have interrupt_main and to behave appropriately when
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139 """Set _interrupt flag to True to have start_new_thread raise
e9953b399d55 dummy_thread modified to have interrupt_main and to behave appropriately when
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140 KeyboardInterrupt upon exiting."""
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2cb969ffe1bf Cause calling interrupt_main in main thread raise KeyboardInterrupt instantly.
Brett Cannon <bcannon@gmail.com>
parents: 29446
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141 if _main:
2cb969ffe1bf Cause calling interrupt_main in main thread raise KeyboardInterrupt instantly.
Brett Cannon <bcannon@gmail.com>
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142 raise KeyboardInterrupt
2cb969ffe1bf Cause calling interrupt_main in main thread raise KeyboardInterrupt instantly.
Brett Cannon <bcannon@gmail.com>
parents: 29446
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143 else:
2cb969ffe1bf Cause calling interrupt_main in main thread raise KeyboardInterrupt instantly.
Brett Cannon <bcannon@gmail.com>
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144 global _interrupt
2cb969ffe1bf Cause calling interrupt_main in main thread raise KeyboardInterrupt instantly.
Brett Cannon <bcannon@gmail.com>
parents: 29446
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145 _interrupt = True