Reference Counting — Python 3.16.0a0 documentation

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free-threaded builds

On free-threaded builds of Python, returning 1 isn’t sufficient to determine if it’s safe to treat o as having no access by other threads. Use PyUnstable_Object_IsUniquelyReferenced() for that instead.

PyUnstable_Object_IsUniquelyReferenced()

On free-threaded builds of Python, returning 1 isn’t sufficient to determine if it’s safe to treat o as having no access by other threads. Use PyUnstable_Object_IsUniquelyReferenced() for that instead.

Python build with Free Threading

On Python build with Free Threading, if refcnt is larger than UINT32_MAX, the object is made immortal.