SC_SWITCHPENDING
if (!ISSET(sc->sc_flags, SC_SWITCHPENDING)) {
CLR(sc->sc_flags, SC_SWITCHPENDING);
CLR(sc->sc_flags, SC_SWITCHPENDING);
if (!ISSET(sc->sc_flags, SC_SWITCHPENDING)) {
CLR(sc->sc_flags, SC_SWITCHPENDING);
if (!ISSET(sc->sc_flags, SC_SWITCHPENDING)) {
CLR(sc->sc_flags, SC_SWITCHPENDING);
CLR(sc->sc_flags, SC_SWITCHPENDING);
if (ISSET(sc->sc_flags, SC_SWITCHPENDING)) {
SET(sc->sc_flags, SC_SWITCHPENDING);