gh-155628: Use a relaxed add for the asyncio task name counter

kddnewton · kddnewton · commit d7dd33206e24 · 2026-08-12T10:53:28.000-04:00
The counter only generates unique default Task names; the add is its
sole access in the free-threaded build, so only the uniqueness of each
returned value matters, which atomicity alone guarantees.
diff --git a/Modules/_asynciomodule.c b/Modules/_asynciomodule.c
@@ -2342,7 +2342,7 @@ _asyncio_Task___init___impl(TaskObj *self, PyObject *coro, PyObject *loop,
         // store the task counter as PyLong in the name
         // for deferred formatting in get_name
 #ifdef Py_GIL_DISABLED
-        unsigned long long counter = _Py_atomic_add_uint64(&state->task_name_counter, 1) + 1;
+        unsigned long long counter = _Py_atomic_add_uint64_relaxed(&state->task_name_counter, 1) + 1;
 #else
         unsigned long long counter = ++state->task_name_counter;
 #endif
