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