https://github.com/python/cpython/commit/00fd5440f03e55718bad76dbc45725f24744596c
commit: 00fd5440f03e55718bad76dbc45725f24744596c
branch: 3.14
author: Miss Islington (bot) <31488909+miss-isling...@users.noreply.github.com>
committer: gpshead <g...@krypto.org>
date: 2025-05-24T04:16:02Z
summary:
[3.14] gh-80334: fix multiprocessing.freeze_support for other spawn platforms
(GH-134462) (#134619)
gh-80334: fix multiprocessing.freeze_support for other spawn platforms
(GH-134462)
Doc/library/multiprocessing.rst: freeze_support: Change to specify spawn method
instead of platform
Have multiprocessing.freeze_support() enable on spawn, not just win32.
---------
(cherry picked from commit 80284b5c5eebd0e603c38322f94a97a2853ceeba)
Co-authored-by: Eddy Mulyono <eddy...@gmail.com>
Co-authored-by: Gregory P. Smith <g...@krypto.org>
files:
A Misc/NEWS.d/next/Library/2025-05-24-03-10-36.gh-issue-80334.z21cMa.rst
M Doc/library/multiprocessing.rst
M Lib/multiprocessing/context.py
diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst
index 6c43d5fe166e2f..6f37930ea80391 100644
--- a/Doc/library/multiprocessing.rst
+++ b/Doc/library/multiprocessing.rst
@@ -1081,7 +1081,7 @@ Miscellaneous
.. function:: freeze_support()
Add support for when a program which uses :mod:`multiprocessing` has been
- frozen to produce a Windows executable. (Has been tested with **py2exe**,
+ frozen to produce an executable. (Has been tested with **py2exe**,
**PyInstaller** and **cx_Freeze**.)
One needs to call this function straight after the ``if __name__ ==
@@ -1099,10 +1099,10 @@ Miscellaneous
If the ``freeze_support()`` line is omitted then trying to run the frozen
executable will raise :exc:`RuntimeError`.
- Calling ``freeze_support()`` has no effect when invoked on any operating
- system other than Windows. In addition, if the module is being run
- normally by the Python interpreter on Windows (the program has not been
- frozen), then ``freeze_support()`` has no effect.
+ Calling ``freeze_support()`` has no effect when the start method is not
+ *spawn*. In addition, if the module is being run normally by the Python
+ interpreter (the program has not been frozen), then ``freeze_support()``
+ has no effect.
.. function:: get_all_start_methods()
diff --git a/Lib/multiprocessing/context.py b/Lib/multiprocessing/context.py
index d0a3ad00e53ad8..051d567d457928 100644
--- a/Lib/multiprocessing/context.py
+++ b/Lib/multiprocessing/context.py
@@ -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()
diff --git
a/Misc/NEWS.d/next/Library/2025-05-24-03-10-36.gh-issue-80334.z21cMa.rst
b/Misc/NEWS.d/next/Library/2025-05-24-03-10-36.gh-issue-80334.z21cMa.rst
new file mode 100644
index 00000000000000..228429516db416
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-05-24-03-10-36.gh-issue-80334.z21cMa.rst
@@ -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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