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C API: Add PyWeakref_GetRef() function #105927
Description
PyWeakref_GET_OBJECT() and PyWeakref_GetObject() return a borrowed reference to the object, or a borrowed reference to None if the object has been finalized. This API is error-prone and not easy to use.
This API was discussed in 2016: https://mail.python.org/archives/list/python-dev@python.org/thread/6BIPI4MCMAZFLJNIZB4JLTBW2COCACQQ/
I propose adding a new PyWeakref_GetRef() C API function which returns a new strong reference to the object, or NULL if the object has been finalized.
Linked PRs
- gh-105927: Refactor weakrefobject.c #105928
- gh-105927: Add _PyWeakref_GET_REF() internal function #105929
- gh-105927: Add PyWeakref_GetRef() function #105932
- gh-105927: _abc and _thread use PyWeakref_GetRef() #105961
- gh-105927: type_from_ref() uses _PyWeakref_GET_REF() #105963
- gh-105927: _ctypes use PyWeakref_GetRef() #105964
- gh-105927: _ssl uses _PyWeakref_GET_REF() #105965
- gh-105927: Fix test_weakref_capi() refleak #105966
- gh-105927: finalize_modules_clear_weaklist() uses _PyWeakref_GET_REF() #105971
- gh-105927: Add _PyWeakref_IS_DEAD() function #105992
- gh-105927: Avoid calling PyWeakref_GET_OBJECT() #105997
- gh-105927: PyImport_AddModule() uses _PyWeakref_GET_REF() #106001
- gh-105927: _ssl GET_SOCKET() uses _PyWeakref_GET_REF() #106002
- gh-105927: Deprecate PyWeakref_GetObject() function #106006
- gh-105927: Remove _PyWeakref_GetWeakrefCount() #106007
- gh-105927: PyWeakref_GetRef() returns 1 on success #106561
- gh-105927: Limit PyWeakref_GetRef() to limited C API 3.13 #117091
Activity
erlend-aasland commentedon Jun 19, 2023
With an error set? If no, would you need to call
PyErr_Occurred()to find out if an error has occurred? See also capi-workgroup/problems#1pythongh-105927: Refactor weakrefobject.c
pythongh-105927: Refactor weakrefobject.c
pythongh-105927: Refactor weakrefobject.c
pythongh-105927: Refactor weakrefobject.c
pythongh-105927: Refactor weakrefobject.c
gh-105927: Refactor weakrefobject.c (#105928)
pythongh-105927: Add _PyWeakref_GET_REF() internal function
vstinner commentedon Jun 20, 2023
No error is set. See PR #105929 for the first part of the implementation.
gh-105927: Add _PyWeakref_GET_REF() internal function (#105929)
pythongh-105927: Add PyWeakref_GetRef() function
pythongh-105927: Add PyWeakref_GetRef() function
erlend-aasland commentedon Jun 20, 2023
Would it be better to return None if the object has been finalized? The idiom is that APIs returning a
PyObjectpointer only will returnNULLin case of error.45 remaining items
pythongh-105927: Deprecate PyWeakref_GetObject() function
pythongh-105927: finalize_modules_clear_weaklist() uses _PyWeakref_GE…
gh-105927: Deprecate PyWeakref_GetObject() function (#106006)
pythongh-106104: Use public weakref APIs in sqlite3
vstinner commentedon Jun 27, 2023
Oh, PEP 703 – Making the Global Interpreter Lock Optional in CPython proposes PyWeakref_FetchObject() which is more or less the PyWeakref_GetRef() function that was just added to Python 3.13.
vstinner commentedon Jun 30, 2023
I added
PyWeakref_GetRef()functions and deprecated PyWeakref_GetObject() and PyWeakref_GET_OBJECT() functions. I close the issue.pythongh-105927: PyWeakref_GetRef() returns 1 on success
gh-105927: PyWeakref_GetRef() returns 1 on success (#106561)
pythongh-105927: Limit PyWeakref_GetRef() to limited C API 3.13
gh-105927: Limit PyWeakref_GetRef() to limited C API 3.13 (#117091)
pythongh-105927: Limit PyWeakref_GetRef() to limited C API 3.13 (pyth…
Squashed commit of the following:
Squashed commit of the following:
pythongh-105927: Limit PyWeakref_GetRef() to limited C API 3.13 (pyth…