bpo-46417: remove_subclass() clears tp_subclasses - #30793
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vstinner merged 1 commit intoJan 22, 2022
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The remove_subclass() function now deletes the dictionary when removing the last subclass (if the dictionary becomes empty) to save memory: set PyTypeObject.tp_subclasses to NULL. remove_subclass() is called when a type is deallocated. _PyType_GetSubclasses() no longer holds a reference to tp_subclasses: its loop cannot modify tp_subclasses.
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The remove_subclass() function now deletes the dictionary when
removing the last subclass (if the dictionary becomes empty) to save
memory: set PyTypeObject.tp_subclasses to NULL. remove_subclass() is
called when a type is deallocated.
_PyType_GetSubclasses() no longer holds a reference to tp_subclasses:
its loop cannot modify tp_subclasses.
https://bugs.python.org/issue46417