ADMIN_SIG_PROBED
while ((sc->admin_signal & ADMIN_SIG_PROBED) == 0) {
if ((sc->admin_signal & ADMIN_SIG_PROBED) == 0) {
atomic_set_int(&sc->admin_signal, ADMIN_SIG_PROBED);
if ((sc->admin_signal & ADMIN_SIG_PROBED) == 0) {
atomic_set_int(&sc->admin_signal, ADMIN_SIG_PROBED);