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[WIP] gh-133931: Introduce _PyObject_XSetRefDelayed to replace Py_XSETREF #134377

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@corona10 corona10 commented May 20, 2025

_PyObject_XSetRefDelayed(PyObject **ptr, PyObject *value)
{
PyObject *old = *ptr;
FT_ATOMIC_STORE_PTR_RELEASE(*ptr, Py_NewRef(value));
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The default build implementation in pycore_pymem.h doesn't include the Py_NewRef().

My preference is to keep the Py_NewRef(value) in the callers, i.e.:

_PyObject_XSetRefDelayed(dictptr, Py_NewRef(value));

to match the semantics of Py_XSETREF.

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Interesting... CI passed in my local but not in the CI.. :(

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Ah okay..

test_aclose (test.test_asyncgen.TestUnawaitedWarnings.test_aclose) ... Assertion failed: (!_Py_IsImmortal(op)), function _Py_ExplicitMergeRefcount, file object.c, line 467.

@corona10 corona10 changed the title gh-133931: Introduce _PyObject_XSetRefDelayed to replace Py_XSETREF [WIP] gh-133931: Introduce _PyObject_XSetRefDelayed to replace Py_XSETREF May 21, 2025
@markshannon
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Why do we need _PyObject_XSetRefDelayed? It looks like all uses of it are wrapped in critical sections where the old Py_XSETREF would work.

Also, what is "delayed"? Either choose a clearer name, or add an explanatory comment in the header file.

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