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gh-117657: Quiet TSAN warning about a data race between `start_the_world()` and `tstate_try_attach()` (#117828) 

TSAN erroneously reports a data race between the `_Py_atomic_compare_exchange_int`
on `tstate->state` in `tstate_try_attach()` and the non-atomic load of
`tstate->state` in `start_the_world`. The `_Py_atomic_compare_exchange_int` fails,
but TSAN erroneously treats it as a store.
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mpage 2024-04-15 09:17:33 -07:00 committed by GitHub
parent 47832067da
commit 6e0b327690
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1 changed files with 2 additions and 1 deletions
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Python/pystate.c
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@ -2248,7 +2248,8 @@ start_the_world(struct _stoptheworld_state *stw)
PyThreadState *t;
_Py_FOR_EACH_THREAD(stw, i, t) {
if (t != stw->requester) {
assert(t->state == _Py_THREAD_SUSPENDED);
assert(_Py_atomic_load_int_relaxed(&t->state) ==
_Py_THREAD_SUSPENDED);
_Py_atomic_store_int(&t->state, _Py_THREAD_DETACHED);
_PyParkingLot_UnparkAll(&t->state);
}