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Code Issues Projects Releases Packages Wiki Activity Actions 17

Issue #18999: Make multiprocessing use context objects.

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This allows different parts of a program to use different methods for
starting processes without interfering with each other.
This commit is contained in:
Richard Oudkerk 2013-10-16 16:41:56 +01:00
parent 3e4b52875e
commit b1694cf588
20 changed files with 733 additions and 611 deletions
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21
Lib/multiprocessing/process.py
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@ -7,7 +7,7 @@
# Licensed to PSF under a Contributor Agreement.
#
__all__ = ['Process', 'current_process', 'active_children']
__all__ = ['BaseProcess', 'current_process', 'active_children']
#
# Imports
@ -59,13 +59,14 @@ def _cleanup():
# The `Process` class
#
class Process(object):
class BaseProcess(object):
'''
Process objects represent activity that is run in a separate process
The class is analogous to `threading.Thread`
'''
_Popen = None
def _Popen(self):
raise NotImplementedError
def __init__(self, group=None, target=None, name=None, args=(), kwargs={},
*, daemon=None):
@ -101,11 +102,7 @@ class Process(object):
assert not _current_process._config.get('daemon'), \
'daemonic processes are not allowed to have children'
_cleanup()
if self._Popen is not None:
Popen = self._Popen
else:
from .popen import Popen
self._popen = Popen(self)
self._popen = self._Popen(self)
self._sentinel = self._popen.sentinel
_children.add(self)
@ -229,10 +226,12 @@ class Process(object):
##
def _bootstrap(self):
from . import util
from . import util, context
global _current_process, _process_counter, _children
try:
if self._start_method is not None:
context._force_start_method(self._start_method)
_process_counter = itertools.count(1)
_children = set()
if sys.stdin is not None:
@ -282,7 +281,7 @@ class Process(object):
class AuthenticationString(bytes):
def __reduce__(self):
from .popen import get_spawning_popen
from .context import get_spawning_popen
if get_spawning_popen() is None:
raise TypeError(
'Pickling an AuthenticationString object is '
@ -294,7 +293,7 @@ class AuthenticationString(bytes):
# Create object representing the main process
#
class _MainProcess(Process):
class _MainProcess(BaseProcess):
def __init__(self):
self._identity = ()