mirror of https://github.com/python/cpython
gh-117657: Make Py_TYPE and Py_SET_TYPE thread safe (GH-120165)
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com> Co-authored-by: Nadeshiko Manju <me@manjusaka.me>
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@ -401,7 +401,10 @@ PyAPI_FUNC(PyStatus) _PyInterpreterState_New(
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#define RARE_EVENT_INTERP_INC(interp, name) \
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do { \
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/* saturating add */ \
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if (interp->rare_events.name < UINT8_MAX) interp->rare_events.name++; \
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int val = FT_ATOMIC_LOAD_UINT8_RELAXED(interp->rare_events.name); \
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if (val < UINT8_MAX) { \
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FT_ATOMIC_STORE_UINT8(interp->rare_events.name, val + 1); \
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} \
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RARE_EVENT_STAT_INC(name); \
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} while (0); \
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@ -246,7 +246,11 @@ _Py_IsOwnedByCurrentThread(PyObject *ob)
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// bpo-39573: The Py_SET_TYPE() function must be used to set an object type.
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static inline PyTypeObject* Py_TYPE(PyObject *ob) {
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#ifdef Py_GIL_DISABLED
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return (PyTypeObject *)_Py_atomic_load_ptr_relaxed(&ob->ob_type);
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#else
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return ob->ob_type;
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#endif
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}
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#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < 0x030b0000
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# define Py_TYPE(ob) Py_TYPE(_PyObject_CAST(ob))
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@ -274,7 +278,11 @@ static inline int Py_IS_TYPE(PyObject *ob, PyTypeObject *type) {
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static inline void Py_SET_TYPE(PyObject *ob, PyTypeObject *type) {
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#ifdef Py_GIL_DISABLED
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_Py_atomic_store_ptr(&ob->ob_type, type);
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#else
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ob->ob_type = type;
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#endif
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}
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#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < 0x030b0000
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# define Py_SET_TYPE(ob, type) Py_SET_TYPE(_PyObject_CAST(ob), type)
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@ -96,6 +96,32 @@ class TestType(TestCase):
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self.run_one(writer_func, reader_func)
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def test___class___modification(self):
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class Foo:
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pass
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class Bar:
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pass
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thing = Foo()
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def work():
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foo = thing
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for _ in range(10000):
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foo.__class__ = Bar
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type(foo)
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foo.__class__ = Foo
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type(foo)
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threads = []
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for i in range(NTHREADS):
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thread = threading.Thread(target=work)
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thread.start()
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threads.append(thread)
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for thread in threads:
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thread.join()
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def run_one(self, writer_func, reader_func):
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writer = Thread(target=writer_func)
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readers = []
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@ -6633,9 +6633,15 @@ object_set_class(PyObject *self, PyObject *value, void *closure)
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if (newto->tp_flags & Py_TPFLAGS_HEAPTYPE) {
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Py_INCREF(newto);
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}
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Py_BEGIN_CRITICAL_SECTION(self);
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// The real Py_TYPE(self) (`oldto`) may have changed from
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// underneath us in another thread, so we re-fetch it here.
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oldto = Py_TYPE(self);
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Py_SET_TYPE(self, newto);
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if (oldto->tp_flags & Py_TPFLAGS_HEAPTYPE)
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Py_END_CRITICAL_SECTION();
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if (oldto->tp_flags & Py_TPFLAGS_HEAPTYPE) {
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Py_DECREF(oldto);
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}
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RARE_EVENT_INC(set_class);
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return 0;
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@ -37,7 +37,6 @@ race_top:set_contains_key
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# https://gist.github.com/colesbury/d13d033f413b4ad07929d044bed86c35
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race_top:set_discard_entry
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race_top:set_inheritable
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race_top:Py_SET_TYPE
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race_top:_PyDict_CheckConsistency
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race_top:_Py_dict_lookup_threadsafe
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race_top:_multiprocessing_SemLock_acquire_impl
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@ -58,7 +57,6 @@ race_top:_PyFrame_Initialize
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race_top:PyInterpreterState_ThreadHead
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race_top:_PyObject_TryGetInstanceAttribute
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race_top:PyThreadState_Next
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race_top:Py_TYPE
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race_top:PyUnstable_InterpreterFrame_GetLine
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race_top:sock_close
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race_top:tstate_delete_common
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