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1. Commits on Oct 21, 2026

   • [3.15] gh-158197: Fix split dict iteration during concurrent deletion (gh-158686) (#159953)

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     miss-islington

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     nascheme

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2. Commits on Mar 20, 2026

   • gh-146227: Fix wrong type in _Py_atomic_load_uint16 in pyatomic_std.h (gh-146229)

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     colesbury

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3. Commits on Dec 19, 2025

   • gh-120321: Make gi_frame_state transitions atomic in FT build (gh-142599)

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     colesbury

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4. Commits on Dec 3, 2024

   • gh-117657: TSAN Fix races in `PyMember_Get` and `PyMember_Set` for C extensions (GH-123211)

     dpdani

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5. Commits on Jul 8, 2024

   • gh-121368: Fix seq lock memory ordering in _PyType_Lookup (#121388)

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     colesbury

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6. Commits on May 6, 2024

   • gh-118362: Fix thread safety around lookups from the type cache in the face of concurrent mutators (#118454)

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     DinoV

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7. Commits on Apr 19, 2024

   • gh-116818: Make `sys.settrace`, `sys.setprofile`, and monitoring thread-safe (#116775)

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     DinoV

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8. Commits on Feb 21, 2024

   • gh-112075: Make PyDictKeysObject thread-safe (#114741)

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     DinoV

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9. Commits on Feb 16, 2024

   • gh-115103: Implement delayed memory reclamation (QSBR) (#115180)

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     colesbury

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   • gh-114271: Make `thread._rlock` thread-safe in free-threaded builds (#115102)

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     mpage

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10. Commits on Feb 15, 2024

    • gh-113743: Make the MRO cache thread-safe in free-threaded builds (#113930)

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      DinoV

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11. Commits on Oct 16, 2023

    • gh-109693: Update _gil_runtime_state.locked to use pyatomic.h (gh-110836)

      corona10

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12. Commits on Sep 19, 2023

    • gh-108724: Add PyMutex and _PyParkingLot APIs (gh-109344)

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      colesbury

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      ericsnowcurrently

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13. Commits on Aug 31, 2023

    • gh-108337: Add pyatomic.h header (#108701)

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      vstinner

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      colesbury

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