8000 gh-128100: Atomic dict load in _PyObject_GenericGetAttrWithDict by wrongnull · Pull Request #128297 · python/cpython · GitHub
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gh-128100: Atomic dict load in _PyObject_GenericGetAttrWithDict #128297

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Merged
merged 4 commits into from
Dec 30, 2024
Merged

gh-128100: Atomic dict load in _PyObject_GenericGetAttrWithDict #128297

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c8ccd02
Implement atomic load and critical section in C code
wrongnull Dec 26, 2024
3d0d584
Add tests
wrongnull Dec 26, 2024
7227e3e
Address the review
wrongnull Dec 27, 2024
b92759a
Remove test case.
colesbury Dec 30, 2024
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Address the review
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@wrongnull
wrongnull committed Dec 27, 2024
commit 7227e3ed103e10f13251f60a1c75ec69def704e9
10 changes: 4 additions & 6 deletions Objects/object.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1715,16 +1715,14 @@ _PyObject_GenericGetAttrWithDict(PyObject *obj, PyObject *name,
dict = (PyObject *)_PyObject_GetManagedDict(obj);
}
else {
Py_BEGIN_CRITICAL_SECTION(obj);
#ifdef DISABLE_GIL
PyObject **dictptr = _Py_atomic_load_ptr(_PyObject_ComputedDictPointer(obj));
#else
PyObject **dictptr = _PyObject_ComputedDictPointer(obj);
#endif
if (dictptr) {
#ifdef Py_GIL_DISABLED
dict = _Py_atomic_load_ptr_acquire(dictptr);
#else
dict = *dictptr;
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@ZeroIntensity ZeroIntensity Dec 27, 2024

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Here is where the atomic load should be. (And, as Sam said in the issue, we want _Py_atomic_load_ptr_acquire instead of plain old _Py_atomic_load_ptr.)

#endif
}
Py_END_CRITICAL_SECTION();
}
}
if (dict != NULL) {
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