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GH-80334: make multiprocessing freeze_support() usable on all spawn default platforms, not just windows #134617

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GH-80334: make multiprocessing freeze_support() usable on all spawn default platforms, not just windows #134617

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gh-80334: Have multiprocessing.freeze_support() enable on spawn, not …
gpshead May 24, 2025
7264d23
NEWS
gpshead May 24, 2025
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2 changes: 1 addition & 1 deletion Lib/multiprocessing/context.py
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Original file line number Diff line number Diff line change
Expand Up @@ -145,7 +145,7 @@ def freeze_support(self):
'''Check whether this is a fake forked process in a frozen executable.
If so then run code specified by commandline and exit.
'''
if sys.platform == 'win32' and getattr(sys, 'frozen', False):
if self.get_start_method() == 'spawn' and getattr(sys, 'frozen', False):
from .spawn import freeze_support
freeze_support()

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2025-05-24-03-10-36.gh-issue-80334.z21cMa.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
:func:`multiprocessing.freeze_support` now checks for work on any "spawn"
start method platform rather than only on Windows.
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