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gh-128008: Add PyWeakref_IsDead() (GH-128009)

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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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Sam Gross 2024-12-19 10:17:15 -05:00 • committed by GitHub
parent b9b3e4a076
commit 7b811d0562
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Include/cpython/weakrefobject.h
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@ -45,6 +45,9 @@ PyAPI_FUNC(void) _PyWeakref_ClearRef(PyWeakReference *self);
#define _PyWeakref_CAST(op) \
(assert(PyWeakref_Check(op)), _Py_CAST(PyWeakReference*, (op)))
// Test if a weak reference is dead.
PyAPI_FUNC(int) PyWeakref_IsDead(PyObject *ref);
Py_DEPRECATED(3.13) static inline PyObject* PyWeakref_GET_OBJECT(PyObject *ref_obj)
{
PyWeakReference *ref = _PyWeakref_CAST(ref_obj);