gh-133980: use atomic store in PyObject_GenericSetDict
#133988
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Contributor
kumaraditya303
commented
May 14, 2025
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kumaraditya303
commented
- Issue: Some operations on managed dict are not safe from memory_order POV #133980
kumaraditya303
added
topic-free-threading
needs backport to 3.14
colesbury
reviewed
May 14, 2025
| Py_XSETREF(*dictptr, Py_NewRef(value)); | ||
| PyObject *olddict = *dictptr; | ||
| FT_ATOMIC_STORE_PTR_RELEASE(*dictptr, Py_NewRef(value)); | ||
| Py_XDECREF(olddict); |
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I think we need to use _PyObject_XDecRefDelayed() or similar here.
See the implementation of _PyObject_SetManagedDict(), which handles something very similar.
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