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[3.13] gh-117657: Make Py_TYPE and Py_SET_TYPE thread safe (GH-120165) (GH-120403)

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gh-117657: Make Py_TYPE and Py_SET_TYPE thread safe (GH-120165)
(cherry picked from commit e16aed63f6)

Co-authored-by: Ken Jin <kenjin@python.org>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
Co-authored-by: Nadeshiko Manju <me@manjusaka.me>
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Miss Islington (bot) 2024-06-12 15:37:26 +02:00 • committed by GitHub
parent 39825a7533
commit 91c4444d22
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5 changed files with 45 additions and 4 deletions
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8
Objects/typeobject.c
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@ -6474,9 +6474,15 @@ object_set_class(PyObject *self, PyObject *value, void *closure)
if (newto->tp_flags & Py_TPFLAGS_HEAPTYPE) {
Py_INCREF(newto);
}
Py_BEGIN_CRITICAL_SECTION(self);
// The real Py_TYPE(self) (`oldto`) may have changed from
// underneath us in another thread, so we re-fetch it here.
oldto = Py_TYPE(self);
Py_SET_TYPE(self, newto);
if (oldto->tp_flags & Py_TPFLAGS_HEAPTYPE)
Py_END_CRITICAL_SECTION();
if (oldto->tp_flags & Py_TPFLAGS_HEAPTYPE) {
Py_DECREF(oldto);
}
RARE_EVENT_INC(set_class);
return 0;