145 lines
4.2 KiB
Python
145 lines
4.2 KiB
Python
#
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# Support for the API of the multiprocessing package using threads
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#
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# multiprocessing/dummy/__init__.py
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#
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# Copyright (c) 2006-2008, R Oudkerk
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. Neither the name of author nor the names of any contributors may be
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# used to endorse or promote products derived from this software
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# without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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__all__ = [
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'Process', 'current_process', 'active_children', 'freeze_support',
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'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Condition',
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'Event', 'Barrier', 'Queue', 'Manager', 'Pipe', 'Pool', 'JoinableQueue'
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]
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#
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# Imports
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#
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import threading
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import sys
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import weakref
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import array
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from multiprocessing.dummy.connection import Pipe
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from threading import Lock, RLock, Semaphore, BoundedSemaphore
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from threading import Event, Condition, Barrier
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from queue import Queue
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#
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#
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#
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class DummyProcess(threading.Thread):
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def __init__(self, group=None, target=None, name=None, args=(), kwargs={}):
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threading.Thread.__init__(self, group, target, name, args, kwargs)
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self._pid = None
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self._children = weakref.WeakKeyDictionary()
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self._start_called = False
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self._parent = current_process()
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def start(self):
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assert self._parent is current_process()
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self._start_called = True
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if hasattr(self._parent, '_children'):
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self._parent._children[self] = None
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threading.Thread.start(self)
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@property
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def exitcode(self):
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if self._start_called and not self.is_alive():
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return 0
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else:
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return None
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#
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#
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#
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Process = DummyProcess
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current_process = threading.current_thread
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current_process()._children = weakref.WeakKeyDictionary()
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def active_children():
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children = current_process()._children
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for p in list(children):
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if not p.is_alive():
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children.pop(p, None)
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return list(children)
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def freeze_support():
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pass
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#
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#
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#
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class Namespace(object):
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def __init__(self, **kwds):
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self.__dict__.update(kwds)
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def __repr__(self):
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items = list(self.__dict__.items())
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temp = []
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for name, value in items:
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if not name.startswith('_'):
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temp.append('%s=%r' % (name, value))
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temp.sort()
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return 'Namespace(%s)' % str.join(', ', temp)
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dict = dict
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list = list
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def Array(typecode, sequence, lock=True):
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return array.array(typecode, sequence)
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class Value(object):
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def __init__(self, typecode, value, lock=True):
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self._typecode = typecode
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self._value = value
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def _get(self):
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return self._value
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def _set(self, value):
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self._value = value
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value = property(_get, _set)
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def __repr__(self):
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return '<%r(%r, %r)>'%(type(self).__name__,self._typecode,self._value)
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def Manager():
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return sys.modules[__name__]
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def shutdown():
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pass
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def Pool(processes=None, initializer=None, initargs=()):
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from multiprocessing.pool import ThreadPool
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return ThreadPool(processes, initializer, initargs)
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JoinableQueue = Queue
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