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Title: gh-157841: Synchronize functools.partial state access by mpage · Pull Request #160480 · python/cpython · GitHub

Open Graph Title: gh-157841: Synchronize functools.partial state access by mpage · Pull Request #160480 · python/cpython

X Title: gh-157841: Synchronize functools.partial state access by mpage · Pull Request #160480 · python/cpython

Description: Acquire coherent strong-reference snapshots under the partial object lock for calls, repr, reduce, and nested-partial construction. Publish replacement state atomically, release displaced references after publication, and retire replaced instance dictionaries through QSBR. Keep free-threaded vectorcall dispatch immutable after construction. Add concurrent state/coherence coverage, placeholder-aware flattening tests, and regressions for reentrant keyword merging and finalizers. Authored with AI and reviewed by me. Issue: gh-157841

Open Graph Description: Acquire coherent strong-reference snapshots under the partial object lock for calls, repr, reduce, and nested-partial construction. Publish replacement state atomically, release displaced reference...

X Description: Acquire coherent strong-reference snapshots under the partial object lock for calls, repr, reduce, and nested-partial construction. Publish replacement state atomically, release displaced reference...

Opengraph URL: https://github.com/python/cpython/pull/160480

X: @github

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cae9916 gh-157841: Synchronize functools.partial state access mpage Oct 23, 2026 https://github.com/python/cpython/pull/160480/commits/cae99164aa7bf958f898e8ae287c38f463166b29
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