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This commit is contained in:
LloydZ 2026-04-16 04:09:27 +00:00
parent 67e25c42e8
commit eff4a06829
1 changed files with 7 additions and 5 deletions
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12
Objects/typeobject.c
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@ -6420,16 +6420,18 @@ void
_PyType_SetFlagsRecursive(PyTypeObject *self, unsigned long mask, unsigned long flags)
{
BEGIN_TYPE_LOCK();
/* Invalidate the old version before changing flags. This must happen
before types_stop_world(); immutable/static-builtin types are
skipped because set_flags_recursive() does not touch them. */
/* Ideally, changing flags and invalidating the old version tag would
happen in one step. But type_modified_unlocked() is re-entrant and
cannot run with the world stopped, so we must invalidate first.
Immutable/static-builtin types are skipped because
set_flags_recursive() does not modify them. */
if (!PyType_HasFeature(self, Py_TPFLAGS_IMMUTABLETYPE) &&
(self->tp_flags & mask) != flags)
{
type_modified_unlocked(self);
}
/* Keep TYPE_LOCK held while waiting for stop-the-world so no thread
can reassign a version tag before the flag update. */
/* Keep TYPE_LOCK held while waiting for stop-the-world so no thread
can reassign a version tag before the flag update. */
type_lock_prevent_release();
types_stop_world();
set_flags_recursive(self, mask, flags);