From 596fe60baf9f6c9fc9ec5f03f04fdc68bffec1b8 Mon Sep 17 00:00:00 2001 From: Eddy Mulyono Date: Fri, 23 May 2025 23:50:19 -0400 Subject: [PATCH] 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 Co-authored-by: Gregory P. Smith --- Doc/library/multiprocessing.rst | 10 +++++----- Lib/multiprocessing/context.py | 2 +- .../2025-05-24-03-10-36.gh-issue-80334.z21cMa.rst | 2 ++ 3 files changed, 8 insertions(+), 6 deletions(-) create mode 100644 Misc/NEWS.d/next/Library/2025-05-24-03-10-36.gh-issue-80334.z21cMa.rst 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. pFad - Phonifier reborn

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