SC_A_OPEN
atomic_clear_int(&sc->sc_active, SC_A_OPEN);
atomic_set_int(&sc->sc_active, SC_A_OPEN);
atomic_clear_int(&sc->sc_active, SC_A_OPEN);
atomic_set_int(&sc->sc_active, SC_A_OPEN);
#define SC_A_ACTIVE (SC_A_OPEN - 1)
if ((active & SC_A_OPEN) == 0)