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gh-120524: Avoid a Race On _PyRuntime.types.managed_static.types[i].interp_count (gh-120529)

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gh-120182 added new global state (interp_count), but didn't add thread-safety for it.  This change eliminates the possible race.
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Eric Snow 2024-06-17 15:16:00 -04:00 • committed by GitHub
parent e73c42e15c
commit 2c66318cdc
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GPG key ID: B5690EEEBB952194
2 changed files with 4 additions and 3 deletions
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6
Objects/typeobject.c
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@ -246,7 +246,8 @@ managed_static_type_state_init(PyInterpreterState *interp, PyTypeObject *self,
assert((initial == 1) ==
(_PyRuntime.types.managed_static.types[full_index].interp_count == 0));
_PyRuntime.types.managed_static.types[full_index].interp_count += 1;
(void)_Py_atomic_add_int64(
&_PyRuntime.types.managed_static.types[full_index].interp_count, 1);
if (initial) {
assert(_PyRuntime.types.managed_static.types[full_index].type == NULL);
@ -300,7 +301,8 @@ managed_static_type_state_clear(PyInterpreterState *interp, PyTypeObject *self,
state->type = NULL;
assert(state->tp_weaklist == NULL); // It was already cleared out.
_PyRuntime.types.managed_static.types[full_index].interp_count -= 1;
(void)_Py_atomic_add_int64(
&_PyRuntime.types.managed_static.types[full_index].interp_count, -1);
if (final) {
assert(!_PyRuntime.types.managed_static.types[full_index].interp_count);
_PyRuntime.types.managed_static.types[full_index].type = NULL;