gh-130895: fix multiprocessing.Process join/wait/poll races#131440

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duaneg wants to merge 6 commits intopython:mainfrom

duaneg:gh-130895

Commits on Mar 19, 2025

gh-130895: fix multiprocessing.Process join/wait/poll races
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Commits on Apr 17, 2025

Add blurb
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Commits on Nov 2, 2025

Return status code after timeout: usually this will be None, as we are
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Commits on Nov 3, 2025

Merge remote-tracking branch 'origin/main' into waiting/gh-130895
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Ignore fork-in-thread deprecation warnings in test, as now required
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Commits on Nov 29, 2025

Initialise synchronisation-related attributes in polymorphic method so each

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