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[3.14] gh-138813: Fix mutable default kwargs={} in multiprocessing BaseProcess and DummyProcess to use None (GH-138814) (#139084)

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gh-138813: Fix mutable default kwargs={} in multiprocessing BaseProcess and DummyProcess to use None (GH-138814)

* gh-138813: Default `BaseProcess` `kwargs` to `None` (GH-138814)

Set `BaseProcess.__init__(..., kwargs=None)` and initialize `kwargs` with
`dict(kwargs) if kwargs else {}`. This avoids a shared mutable default and
matches threading.Thread behavior.



* DummyProcess kwargs=None (which threading.Thread accepts properly)
(cherry picked from commit 5a15e73789)

Co-authored-by: Denis Sergeev <newjimbatler00@gmail.com>
Co-authored-by: Gregory P. Smith <greg@krypto.org>
Co-authored-by: Petr Viktorin <encukou@gmail.com>
Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
This commit is contained in:
Miss Islington (bot) 2025-10-08 02:37:30 +02:00 • committed by GitHub
parent 64f0e2d6fa
commit 6b26e62f37
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4 changed files with 21 additions and 3 deletions
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4
Lib/multiprocessing/process.py
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@ -77,7 +77,7 @@ class BaseProcess(object):
def _Popen(self):
raise NotImplementedError
def __init__(self, group=None, target=None, name=None, args=(), kwargs={},
def __init__(self, group=None, target=None, name=None, args=(), kwargs=None,
*, daemon=None):
assert group is None, 'group argument must be None for now'
count = next(_process_counter)
@ -89,7 +89,7 @@ def __init__(self, group=None, target=None, name=None, args=(), kwargs={},
self._closed = False
self._target = target
self._args = tuple(args)
self._kwargs = dict(kwargs)
self._kwargs = dict(kwargs) if kwargs else {}
self._name = name or type(self).__name__ + '-' + \
':'.join(str(i) for i in self._identity)
if daemon is not None: