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Title: gh-153060: Add an empty frozendict singleton by vstinner · Pull Request #153061 · python/cpython · GitHub

Open Graph Title: gh-153060: Add an empty frozendict singleton by vstinner · Pull Request #153061 · python/cpython

X Title: gh-153060: Add an empty frozendict singleton by vstinner · Pull Request #153061 · python/cpython

Description: The singleton is created immortal to avoid refcount contention in Free Threading. Add PyInterpreterState.dict_state.empty_frozendict. Add _PyDict_Init() and _PyDict_Fini() to create and destroy the empty frozendict singleton. Issue: gh-153060

Open Graph Description: The singleton is created immortal to avoid refcount contention in Free Threading. Add PyInterpreterState.dict_state.empty_frozendict. Add _PyDict_Init() and _PyDict_Fini() to create and destroy th...

X Description: The singleton is created immortal to avoid refcount contention in Free Threading. Add PyInterpreterState.dict_state.empty_frozendict. Add _PyDict_Init() and _PyDict_Fini() to create and destroy th...

Opengraph URL: https://github.com/python/cpython/pull/153061

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2e450b1 gh-153060: Add an empty frozendict singleton vstinner Jul 5, 2026 https://github.com/python/cpython/pull/153061/commits/2e450b1dae7ac879a8babd8c76effc4780c6a5df
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b2f1dfe Test that the singleton is not tracked and is immortal vstinner Jul 5, 2026 https://github.com/python/cpython/pull/153061/commits/b2f1dfe7b8b5523a761b2bcdaaba5e162ea4eb42
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959c77c Fix singleton test: pass an empty generator, not a list vstinner Jul 5, 2026 https://github.com/python/cpython/pull/153061/commits/959c77c43c4ddbea805e48ba8edd5b984a5abc9a
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