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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

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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...

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Fix singleton test: pass an empty generator, not a listhttps://github.com/python/cpython/pull/153061/commits/959c77c43c4ddbea805e48ba8edd5b984a5abc9a
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