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gh-76327: freeze_support for non-Windows platforms #104607

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gh-76327: freeze_support for non-Windows platforms #104607

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@zetaloop zetaloop commented May 18, 2023 •
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gh-76327: freeze_support for non-Windows platforms

This is a brief fix for the multiprocessing frozen executable infinite loop issue on non-Windows platform. #76327
And the freeze_support patch was exactly the same patch from PyInstaller, which already worked for them.

This patch does not influence PyInstaller.
However, this patch will enable cx_freeze or other similar tools to build multiprocessing apps for Linux and Mac.

📚 Documentation preview 📚: https://cpython-previews--104607.org.readthedocs.build/

@zetaloop zetaloop requested a review from 1st1 as a code owner May 18, 2023 09:35
@bedevere-bot bedevere-bot mentioned this pull request May 18, 2023
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Most changes to Python require a NEWS entry.

Please add it using the blurb_it web app or the blurb command-line tool.

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ghost commented May 18, 2023 •
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Backport needed.

@arhadthedev arhadthedev added the needs backport to 3.11 only security fixes label May 20, 2023
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Tests done.
Windows 11 (Python 3.11.1): PyInstaller✔️ cx_freeze✔️ py2exe✔️
WSL Ubuntu 22.04 (Python 3.10.6): PyInstaller✔️ cx_freeze✔️

Note: if we don't modify muliprocessing, cx_freeze on Linux will create an app with terrible infinite loop.

import multiprocessing

def worker():
    print('Worker')

if __name__ == '__main__':
    multiprocessing.freeze_support()
    multiprocessing.set_start_method('spawn')
    p = multiprocessing.Process(target=worker)
    p.start()

@marcelotduarte marcelotduarte mentioned this pull request Jul 10, 2023
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@serhiy-storchaka serhiy-storchaka added needs backport to 3.12 only security fixes needs backport to 3.13 bugs and security fixes and removed needs backport to 3.11 only security fixes labels May 9, 2024
@marcelotduarte marcelotduarte mentioned this pull request May 13, 2024
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@tomasr8 tomasr8 removed the needs backport to 3.12 only security fixes label Apr 10, 2025
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