Mercurial > cpython-lru_cache-weakref

annotate Lib/multiprocessing/queues.py @ 54294:dba767bc3155 legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents 26b1ad09d1a7
children 65d1682dcd5e ca51996099fd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
47696
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1 #
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2 # Module implementing queues
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3 #
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4 # multiprocessing/queues.py
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5 #
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6 # Copyright (c) 2006-2008, R Oudkerk --- see COPYING.txt
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7 #
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8
52506
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9 __all__ = ['Queue', 'SimpleQueue', 'JoinableQueue']
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10
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11 import sys
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12 import os
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13 import threading
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14 import collections
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15 import time
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16 import atexit
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17 import weakref
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18
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19 from Queue import Empty, Full
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20 import _multiprocessing
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21 from multiprocessing import Pipe
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22 from multiprocessing.synchronize import Lock, BoundedSemaphore, Semaphore, Condition
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23 from multiprocessing.util import debug, info, Finalize, register_after_fork
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24 from multiprocessing.forking import assert_spawning
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25
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26 #
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27 # Queue type using a pipe, buffer and thread
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28 #
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29
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30 class Queue(object):
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31
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32 def __init__(self, maxsize=0):
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33 if maxsize <= 0:
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34 maxsize = _multiprocessing.SemLock.SEM_VALUE_MAX
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35 self._maxsize = maxsize
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36 self._reader, self._writer = Pipe(duplex=False)
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37 self._rlock = Lock()
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38 self._opid = os.getpid()
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39 if sys.platform == 'win32':
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40 self._wlock = None
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41 else:
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42 self._wlock = Lock()
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43 self._sem = BoundedSemaphore(maxsize)
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44
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45 self._after_fork()
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46
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47 if sys.platform != 'win32':
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48 register_after_fork(self, Queue._after_fork)
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49
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50 def __getstate__(self):
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51 assert_spawning(self)
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52 return (self._maxsize, self._reader, self._writer,
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53 self._rlock, self._wlock, self._sem, self._opid)
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54
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55 def __setstate__(self, state):
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56 (self._maxsize, self._reader, self._writer,
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57 self._rlock, self._wlock, self._sem, self._opid) = state
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58 self._after_fork()
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59
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60 def _after_fork(self):
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61 debug('Queue._after_fork()')
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62 self._notempty = threading.Condition(threading.Lock())
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63 self._buffer = collections.deque()
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64 self._thread = None
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65 self._jointhread = None
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66 self._joincancelled = False
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67 self._closed = False
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68 self._close = None
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69 self._send = self._writer.send
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70 self._recv = self._reader.recv
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71 self._poll = self._reader.poll
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72
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73 def put(self, obj, block=True, timeout=None):
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74 assert not self._closed
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75 if not self._sem.acquire(block, timeout):
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76 raise Full
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77
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78 self._notempty.acquire()
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79 try:
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80 if self._thread is None:
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81 self._start_thread()
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82 self._buffer.append(obj)
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83 self._notempty.notify()
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84 finally:
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85 self._notempty.release()
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86
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87 def get(self, block=True, timeout=None):
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88 if block and timeout is None:
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89 self._rlock.acquire()
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90 try:
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91 res = self._recv()
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92 self._sem.release()
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93 return res
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94 finally:
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95 self._rlock.release()
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96
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97 else:
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98 if block:
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99 deadline = time.time() + timeout
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100 if not self._rlock.acquire(block, timeout):
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101 raise Empty
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102 try:
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103 if not self._poll(block and (deadline-time.time()) or 0.0):
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104 raise Empty
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105 res = self._recv()
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106 self._sem.release()
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107 return res
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108 finally:
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109 self._rlock.release()
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110
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111 def qsize(self):
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112 # Raises NotImplementError on Mac OSX because of broken sem_getvalue()
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113 return self._maxsize - self._sem._semlock._get_value()
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114
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115 def empty(self):
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116 return not self._poll()
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117
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118 def full(self):
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119 return self._sem._semlock._is_zero()
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120
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121 def get_nowait(self):
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122 return self.get(False)
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123
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124 def put_nowait(self, obj):
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125 return self.put(obj, False)
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126
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127 def close(self):
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128 self._closed = True
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129 self._reader.close()
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130 if self._close:
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131 self._close()
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132
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133 def join_thread(self):
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134 debug('Queue.join_thread()')
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135 assert self._closed
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136 if self._jointhread:
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137 self._jointhread()
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138
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139 def cancel_join_thread(self):
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140 debug('Queue.cancel_join_thread()')
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141 self._joincancelled = True
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142 try:
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143 self._jointhread.cancel()
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144 except AttributeError:
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parents: 47694
diff changeset
145 pass
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
146
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
147 def _start_thread(self):
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
148 debug('Queue._start_thread()')
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
149
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
150 # Start thread which transfers data from buffer to pipe
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
151 self._buffer.clear()
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Benjamin Peterson <benjamin@python.org>
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diff changeset
152 self._thread = threading.Thread(
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
153 target=Queue._feed,
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
154 args=(self._buffer, self._notempty, self._send,
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
155 self._wlock, self._writer.close),
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
156 name='QueueFeederThread'
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
157 )
48289
024b2b984866 change a few uses of the threading APIs
Benjamin Peterson <benjamin@python.org>
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diff changeset
158 self._thread.daemon = True
47696
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Benjamin Peterson <benjamin@python.org>
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diff changeset
159
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
160 debug('doing self._thread.start()')
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
161 self._thread.start()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
162 debug('... done self._thread.start()')
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
163
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
164 # On process exit we will wait for data to be flushed to pipe.
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
165 #
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Benjamin Peterson <benjamin@python.org>
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diff changeset
166 # However, if this process created the queue then all
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
167 # processes which use the queue will be descendants of this
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
168 # process. Therefore waiting for the queue to be flushed
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
169 # is pointless once all the child processes have been joined.
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
170 created_by_this_process = (self._opid == os.getpid())
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parents: 47694
diff changeset
171 if not self._joincancelled and not created_by_this_process:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
172 self._jointhread = Finalize(
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
173 self._thread, Queue._finalize_join,
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
174 [weakref.ref(self._thread)],
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
175 exitpriority=-5
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
176 )
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
177
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
178 # Send sentinel to the thread queue object when garbage collected
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Benjamin Peterson <benjamin@python.org>
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diff changeset
179 self._close = Finalize(
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Benjamin Peterson <benjamin@python.org>
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diff changeset
180 self, Queue._finalize_close,
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
181 [self._buffer, self._notempty],
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Benjamin Peterson <benjamin@python.org>
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diff changeset
182 exitpriority=10
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
183 )
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
184
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Benjamin Peterson <benjamin@python.org>
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diff changeset
185 @staticmethod
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Benjamin Peterson <benjamin@python.org>
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186 def _finalize_join(twr):
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diff changeset
187 debug('joining queue thread')
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diff changeset
188 thread = twr()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
189 if thread is not None:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
190 thread.join()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
191 debug('... queue thread joined')
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
192 else:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
193 debug('... queue thread already dead')
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
194
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
195 @staticmethod
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Benjamin Peterson <benjamin@python.org>
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diff changeset
196 def _finalize_close(buffer, notempty):
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
197 debug('telling queue thread to quit')
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
198 notempty.acquire()
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Benjamin Peterson <benjamin@python.org>
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diff changeset
199 try:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
200 buffer.append(_sentinel)
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Benjamin Peterson <benjamin@python.org>
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diff changeset
201 notempty.notify()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
202 finally:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
203 notempty.release()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
204
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
205 @staticmethod
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
206 def _feed(buffer, notempty, send, writelock, close):
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
207 debug('starting thread to feed data to pipe')
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
208 from .util import is_exiting
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
209
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
210 nacquire = notempty.acquire
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
211 nrelease = notempty.release
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
212 nwait = notempty.wait
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
213 bpopleft = buffer.popleft
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
214 sentinel = _sentinel
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
215 if sys.platform != 'win32':
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
216 wacquire = writelock.acquire
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
217 wrelease = writelock.release
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
218 else:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
219 wacquire = None
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
220
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
221 try:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
222 while 1:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
223 nacquire()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
224 try:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
225 if not buffer:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
226 nwait()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
227 finally:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
228 nrelease()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
229 try:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
230 while 1:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
231 obj = bpopleft()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
232 if obj is sentinel:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
233 debug('feeder thread got sentinel -- exiting')
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
234 close()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
235 return
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
236
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
237 if wacquire is None:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
238 send(obj)
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
239 else:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
240 wacquire()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
241 try:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
242 send(obj)
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
243 finally:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
244 wrelease()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
245 except IndexError:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
246 pass
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
247 except Exception, e:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
248 # Since this runs in a daemon thread the resources it uses
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Benjamin Peterson <benjamin@python.org>
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diff changeset
249 # may be become unusable while the process is cleaning up.
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
250 # We ignore errors which happen after the process has
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
251 # started to cleanup.
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
252 try:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
253 if is_exiting():
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
254 info('error in queue thread: %s', e)
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
255 else:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
256 import traceback
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
257 traceback.print_exc()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
258 except Exception:
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
259 pass
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
260
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
261 _sentinel = object()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
262
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
263 #
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Benjamin Peterson <benjamin@python.org>
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diff changeset
264 # A queue type which also supports join() and task_done() methods
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
265 #
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
266 # Note that if you do not call task_done() for each finished task then
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
267 # eventually the counter's semaphore may overflow causing Bad Things
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
268 # to happen.
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
269 #
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Benjamin Peterson <benjamin@python.org>
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diff changeset
270
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
271 class JoinableQueue(Queue):
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diff changeset
272
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Benjamin Peterson <benjamin@python.org>
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diff changeset
273 def __init__(self, maxsize=0):
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parents: 47694
diff changeset
274 Queue.__init__(self, maxsize)
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Benjamin Peterson <benjamin@python.org>
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diff changeset
275 self._unfinished_tasks = Semaphore(0)
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Benjamin Peterson <benjamin@python.org>
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diff changeset
276 self._cond = Condition()
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parents: 47694
diff changeset
277
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Benjamin Peterson <benjamin@python.org>
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diff changeset
278 def __getstate__(self):
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parents: 47694
diff changeset
279 return Queue.__getstate__(self) + (self._cond, self._unfinished_tasks)
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
280
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
281 def __setstate__(self, state):
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diff changeset
282 Queue.__setstate__(self, state[:-2])
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
283 self._cond, self._unfinished_tasks = state[-2:]
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
284
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
285 def put(self, item, block=True, timeout=None):
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parents: 47694
diff changeset
286 Queue.put(self, item, block, timeout)
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
287 self._unfinished_tasks.release()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
288
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
289 def task_done(self):
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
290 self._cond.acquire()
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Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
291 try:
d01165fae98e darn! I converted half of the files the wrong way.
Benjamin Peterson <benjamin@python.org>
parents: 47694
diff changeset
292 if not self._unfinished_tasks.acquire(False):
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293 raise ValueError('task_done() called too many times')
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294 if self._unfinished_tasks._semlock._is_zero():
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295 self._cond.notify_all()
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296 finally:
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297 self._cond.release()
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298
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299 def join(self):
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300 self._cond.acquire()
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301 try:
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302 if not self._unfinished_tasks._semlock._is_zero():
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303 self._cond.wait()
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304 finally:
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305 self._cond.release()
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306
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307 #
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308 # Simplified Queue type -- really just a locked pipe
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309 #
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310
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311 class SimpleQueue(object):
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312
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313 def __init__(self):
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314 self._reader, self._writer = Pipe(duplex=False)
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315 self._rlock = Lock()
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316 if sys.platform == 'win32':
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317 self._wlock = None
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318 else:
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319 self._wlock = Lock()
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320 self._make_methods()
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321
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322 def empty(self):
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323 return not self._reader.poll()
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324
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325 def __getstate__(self):
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326 assert_spawning(self)
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327 return (self._reader, self._writer, self._rlock, self._wlock)
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328
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329 def __setstate__(self, state):
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330 (self._reader, self._writer, self._rlock, self._wlock) = state
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331 self._make_methods()
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332
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333 def _make_methods(self):
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334 recv = self._reader.recv
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335 racquire, rrelease = self._rlock.acquire, self._rlock.release
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336 def get():
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337 racquire()
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338 try:
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339 return recv()
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340 finally:
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Benjamin Peterson <benjamin@python.org>
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341 rrelease()
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342 self.get = get
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343
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344 if self._wlock is None:
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345 # writes to a message oriented win32 pipe are atomic
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346 self.put = self._writer.send
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347 else:
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348 send = self._writer.send
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349 wacquire, wrelease = self._wlock.acquire, self._wlock.release
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350 def put(obj):
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351 wacquire()
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352 try:
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353 return send(obj)
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354 finally:
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Benjamin Peterson <benjamin@python.org>
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355 wrelease()
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356 self.put = put