gh-128008: Add PyWeakref_IsDead()
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The `PyWeakref_IsDead()` function tests if a weak reference is dead without any side effects. Although you can also detect if a weak reference is dead using `PyWeakref_GetRef()`, that function returns a strong reference that must be `Py_DECREF()`'d, which can introduce side effects if the last reference is concurrently dropped (at least in the free threading build).
vstinner
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Dec 17, 2024
Co-authored-by: Victor Stinner <vstinner@python.org>
vstinner
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You just need to add the function to What's New in Python 3.14 > C API > New features: https://docs.python.org/dev/whatsnew/3.14.html#id6
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The `PyWeakref_IsDead()` function tests if a weak reference is dead without any side effects. Although you can also detect if a weak reference is dead using `PyWeakref_GetRef()`, that function returns a strong reference that must be `Py_DECREF()`'d, which can introduce side effects if the last reference is concurrently dropped (at least in the free threading build).
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The `PyWeakref_IsDead()` function tests if a weak reference is dead without any side effects. Although you can also detect if a weak reference is dead using `PyWeakref_GetRef()`, that function returns a strong reference that must be `Py_DECREF()`'d, which can introduce side effects if the last reference is concurrently dropped (at least in the free threading build).
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The
PyWeakref_IsDead()function tests if a weak reference is dead without any side effects. Although you can also detect if a weak reference is dead usingPyWeakref_GetRef(), that function returns a strong reference that must bePy_DECREF()'d, which can introduce side effects if the last reference is concurrently dropped.PyWeakref_IsDead()to test if a weak reference is dead #128008📚 Documentation preview 📚: https://cpython-previews--128009.org.readthedocs.build/en/128009/c-api/weakref.html#c.PyWeakref_IsDead