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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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13
Objects/weakrefobject.c
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@ -932,6 +932,19 @@ PyWeakref_NewProxy(PyObject *ob, PyObject *callback)
return (PyObject *)get_or_create_weakref(type, ob, callback);
}
int
PyWeakref_IsDead(PyObject *ref)
{
if (ref == NULL) {
PyErr_BadInternalCall();
return -1;
}
if (!PyWeakref_Check(ref)) {
PyErr_Format(PyExc_TypeError, "expected a weakref, got %T", ref);
return -1;
}
return _PyWeakref_IS_DEAD(ref);
}
int
PyWeakref_GetRef(PyObject *ref, PyObject **pobj)