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[3.13] gh-117657: Fix data races reported by TSAN in some set methods (GH-120914) (#121240)

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Refactor the fast Unicode hash check into `_PyObject_HashFast` and use relaxed
atomic loads in the free-threaded build.

After this change, the TSAN doesn't report data races for this method.
(cherry picked from commit 294e724964)

Co-authored-by: AN Long <aisk@users.noreply.github.com>
This commit is contained in:
Miss Islington (bot) 2024-07-01 21:40:28 +02:00 • committed by GitHub
parent fc0b1cbdfe
commit 06fd745dd9
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6 changed files with 81 additions and 121 deletions
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14
Include/internal/pycore_object.h
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@ -628,6 +628,20 @@ _PyObject_IS_GC(PyObject *obj)
&& (type->tp_is_gc == NULL || type->tp_is_gc(obj)));
}
// Fast inlined version of PyObject_Hash()
static inline Py_hash_t
_PyObject_HashFast(PyObject *op)
{
if (PyUnicode_CheckExact(op)) {
Py_hash_t hash = FT_ATOMIC_LOAD_SSIZE_RELAXED(
_PyASCIIObject_CAST(op)->hash);
if (hash != -1) {
return hash;
}
}
return PyObject_Hash(op);
}
// Fast inlined version of PyType_IS_GC()
#define _PyType_IS_GC(t) _PyType_HasFeature((t), Py_TPFLAGS_HAVE_GC)