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#
# Support for the API of the multiprocessing package using threads
#
# multiprocessing/dummy/__init__.py
#
# Copyright (c) 2006-2008, R Oudkerk
# Licensed to PSF under a Contributor Agreement.
#
__all__ = [
'Process', 'current_process', 'active_children', 'freeze_support',
'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Condition',
'Event', 'Barrier', 'Queue', 'Manager', 'Pipe', 'Pool', 'JoinableQueue'
]
#
# Imports
#
import threading
import sys
import weakref
import array
from .connection import Pipe
from threading import Lock, RLock, Semaphore, BoundedSemaphore
from threading import Event, Condition, Barrier
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):
if self._parent is not current_process():
raise RuntimeError(
"Parent is {0!r} but current_process is {1!r}".format(
self._parent, current_process()))
self._start_called = True
if hasattr(self._parent, '_children'):
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
#
#
#
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 '%s(%s)' % (self.__class__.__name__, ', '.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
@property
def value(self):
return self._value
@value.setter
def value(self, value):
self._value = value
def __repr__(self):
return '<%s(%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 ..pool import ThreadPool
return ThreadPool(processes, initializer, initargs)
JoinableQueue = Queue
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