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gh-118789: Add PyUnstable_Object_ClearWeakRefsNoCallbacks (#118807)

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This exposes `PyUnstable_Object_ClearWeakRefsNoCallbacks` as an unstable
C-API function to provide a thread-safe mechanism for clearing weakrefs
without executing callbacks.

Some C-API extensions need to clear weakrefs without calling callbacks,
such as after running finalizers like we do in subtype_dealloc.
Previously they could use `_PyWeakref_ClearRef` on each weakref, but
that's not thread-safe in the free-threaded build.

Co-authored-by: Petr Viktorin <encukou@gmail.com>
This commit is contained in:
Sam Gross 2024-06-18 09:57:23 -04:00 • committed by GitHub
parent 360f14a493
commit e8752d7b80
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8 changed files with 68 additions and 4 deletions
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8
Modules/_testcapi/object.c
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@ -117,11 +117,19 @@ pyobject_print_os_error(PyObject *self, PyObject *args)
Py_RETURN_NONE;
}
static PyObject *
pyobject_clear_weakrefs_no_callbacks(PyObject *self, PyObject *obj)
{
PyUnstable_Object_ClearWeakRefsNoCallbacks(obj);
Py_RETURN_NONE;
}
static PyMethodDef test_methods[] = {
{"call_pyobject_print", call_pyobject_print, METH_VARARGS},
{"pyobject_print_null", pyobject_print_null, METH_VARARGS},
{"pyobject_print_noref_object", pyobject_print_noref_object, METH_VARARGS},
{"pyobject_print_os_error", pyobject_print_os_error, METH_VARARGS},
{"pyobject_clear_weakrefs_no_callbacks", pyobject_clear_weakrefs_no_callbacks, METH_O},
{NULL},
};