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Issue #14548: Make multiprocessing finalizers check pid before running

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This protects from possibilty of gc running just after fork.
This commit is contained in:
Richard Oudkerk 2012-05-25 13:54:53 +01:00
parent 692130a231
commit 739ae5692e
2 changed files with 12 additions and 3 deletions
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12
Lib/multiprocessing/util.py
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@ -9,6 +9,7 @@
import sys
import functools
import os
import itertools
import weakref
import atexit
@ -161,6 +162,7 @@ class Finalize(object):
self._args = args
self._kwargs = kwargs or {}
self._key = (exitpriority, next(_finalizer_counter))
self._pid = os.getpid()
_finalizer_registry[self._key] = self
@ -177,9 +179,13 @@ class Finalize(object):
except KeyError:
sub_debug('finalizer no longer registered')
else:
sub_debug('finalizer calling %s with args %s and kwargs %s',
self._callback, self._args, self._kwargs)
res = self._callback(*self._args, **self._kwargs)
if self._pid != os.getpid():
sub_debug('finalizer ignored because different process')
res = None
else:
sub_debug('finalizer calling %s with args %s and kwargs %s',
self._callback, self._args, self._kwargs)
res = self._callback(*self._args, **self._kwargs)
self._weakref = self._callback = self._args = \
self._kwargs = self._key = None
return res