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gh-118362: Fix thread safety around lookups from the type cache in the face of concurrent mutators (#118454)

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Add _PyType_LookupRef and use incref before setting attribute on type
Makes setting an attribute on a class and signaling type modified atomic
Avoid adding re-entrancy exposing the type cache in an inconsistent state by decrefing after type is updated
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Dino Viehland 2024-05-06 10:50:35 -07:00 • committed by GitHub
parent e6b213ee3f
commit 5a1618a2c8
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18 changed files with 439 additions and 126 deletions
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Include/internal/pycore_object.h
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@ -658,6 +658,7 @@ extern PyObject *_PyType_NewManagedObject(PyTypeObject *type);
extern PyTypeObject* _PyType_CalculateMetaclass(PyTypeObject *, PyObject *);
extern PyObject* _PyType_GetDocFromInternalDoc(const char *, const char *);
extern PyObject* _PyType_GetTextSignatureFromInternalDoc(const char *, const char *, int);
extern int _PyObject_SetAttributeErrorContext(PyObject *v, PyObject* name);
void _PyObject_InitInlineValues(PyObject *obj, PyTypeObject *tp);
extern int _PyObject_StoreInstanceAttribute(PyObject *obj,