gh-125053: Document that ob_mutex must only be used via critical section API #144599
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…l section API Add a warning in the free-threading extensions howto explaining that PyObject.ob_mutex is reserved for the critical section API and must not be locked directly with PyMutex_Lock, as this can cause deadlocks. Extension authors who need their own lock should add a separate PyMutex field to their object struct. Also add an ob_mutex member entry under PyObject in the C API reference (Doc/c-api/structures.rst) with a cross-reference to the howto.
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Summary
ob_mutex)" subsection to the free-threading extensions howto (Doc/howto/free-threading-extensions.rst) warning thatob_mutexis reserved for the critical section API and must not be locked directly withPyMutex_Lockob_mutexmember entry underPyObjectin the C API reference (Doc/c-api/structures.rst) with a cross-reference to the howtoCloses #125053
Test plan
make htmlinDoc/builds with no warningsstructures.htmltofree-threading-extensions.html#per-object-locksrenders correctlyInclude/object.h,Include/cpython/pylock.h,Include/internal/pycore_critical_section.h)ob_mutexshould only be used with the critical section API #125053📚 Documentation preview 📚: https://cpython-previews--144599.org.readthedocs.build/