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1. Commits on Oct 12, 2026

   • gh-155717: Determine multiprocessing's default start method lazily (GH-159254)

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     gpshead

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     fedonman

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2. Commits on Aug 16, 2026

   • gh-155717: use `spawn` as the default start method for read-only filesystems (#155827)

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     picnixz

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3. Commits on May 18, 2026

   • gh-149879: Fix multiprocessing tests on Cygwin (#150031)

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     vstinner

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4. Commits on Mar 16, 2026

   • gh-140814: Fix freeze_support() setting start method as side effect (GH-144608)

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5. Commits on Jan 18, 2026

   • gh-141860: Add on_error= keyword arg to `multiprocessing.set_forkserver_preload` (GH-141859)

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     gpshead

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6. Commits on May 24, 2025

   • gh-80334: fix multiprocessing.freeze_support for other spawn platforms (GH-134462)

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     eddymul

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     gpshead

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7. Commits on Sep 26, 2024

   • gh-84559: Change the multiprocessing start method default to `forkserver` (GH-101556)

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8. Commits on Jun 13, 2024

   • gh-120417: Add #noqa to used imports in the stdlib (#120421)

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     vstinner

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9. Commits on Feb 3, 2023

   • gh-84559: Remove the new multiprocessing warning, too disruptive. (#101551)

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     gpshead

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10. Commits on Feb 2, 2023

    • GH-84559: Deprecate fork being the multiprocessing default. (#100618)

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      gpshead

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11. Commits on Jun 9, 2022

    • gh-90549: Fix leak of global named resources using multiprocessing spawn (#30617)

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12. Commits on May 26, 2020

    • bpo-39244: multiprocessing return default start method first on macOS (GH-18625)

      idomic

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13. Commits on May 28, 2019

    • bpo-33725: multiprocessing uses spawn by default on macOS (GH-13603)

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      vstinner

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14. Commits on May 20, 2019

    • bpo-36888: Add multiprocessing.parent_process() (GH-13247)

      

      tomMoral

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      pitrou

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15. Commits on Jul 11, 2018

    • Simplify __all__ in multiprocessing (GH-6856)

      

      bombs-kim

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      methane

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16. Commits on May 18, 2017

    • bpo-30296 Remove unnecessary tuples, lists, sets, and dicts (#1489)

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      jdufresne

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      rhettinger

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17. Commits on Apr 5, 2017

    • bpo-29762: More use "raise from None". (#569)

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      serhiy-storchaka

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18. Commits on Dec 10, 2016

    • Issue #28779: multiprocessing.set_forkserver_preload() would crash the forkserver process if a preloaded module instantiated some multiprocessing objects such as locks.

      pitrou

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    • Issue #28779: multiprocessing.set_forkserver_preload() would crash the forkserver process if a preloaded module instantiated some multiprocessing objects such as locks.

      pitrou

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19. Commits on Sep 9, 2016

    • Issue #28053: Applying refactorings, docs and other cleanup to follow.

      applio

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20. Commits on Oct 16, 2013

    • Issue #18999: Make multiprocessing use context objects.

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      shibturn

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