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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
colesbury merged 4 commits into from
Dec 30, 2024
Conversation 9 Commits 4 Checks 0 Files changed
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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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4 changes: 4 additions & 0 deletions Objects/object.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1717,7 +1717,11 @@ _PyObject_GenericGetAttrWithDict(PyObject *obj, PyObject *name,
else {
PyObject **dictptr = _PyObject_ComputedDictPointer(obj);
if (dictptr) {
#ifdef Py_GIL_DISABLED
dict = _Py_atomic_load_ptr_acquire(dictptr);
#else
dict = *dictptr;

ZeroIntensity Dec 27, 2024

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

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
}
}
}
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