[3.13] gh-118789: Add PyUnstable_Object_ClearWeakRefsNoCallbacks (GH-118807)
#120695
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…thonGH-118807) This exposes `PyUnstable_Object_ClearWeakRefsNoCallbacks` as an unstable C-API function to provide a thread-safe mechanism for clearing weakrefs without executing callbacks. Some C-API extensions need to clear weakrefs without calling callbacks, such as after running finalizers like we do in subtype_dealloc. Previously they could use `_PyWeakref_ClearRef` on each weakref, but that's not thread-safe in the free-threaded build. (cherry picked from commit e8752d7) Co-authored-by: Sam Gross <colesbury@gmail.com> Co-authored-by: Petr Viktorin <encukou@gmail.com>
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This exposes
PyUnstable_Object_ClearWeakRefsNoCallbacksas an unstableC-API function to provide a thread-safe mechanism for clearing weakrefs
without executing callbacks.
Some C-API extensions need to clear weakrefs without calling callbacks,
such as after running finalizers like we do in subtype_dealloc.
Previously they could use
_PyWeakref_ClearRefon each weakref, butthat's not thread-safe in the free-threaded build.
(cherry picked from commit e8752d7)
Co-authored-by: Sam Gross colesbury@gmail.com
Co-authored-by: Petr Viktorin encukou@gmail.com
_PyWeakref_ClearRefand_PyWeakref_ClearWeakRefsExceptCallbacksshould be exposed in 3.13 #118789📚 Documentation preview 📚: https://cpython-previews--120695.org.readthedocs.build/