ILF_RUNNING
sc->sc_flags &= ~ILF_RUNNING;
if (sc->sc_flags & ILF_RUNNING)
sc->sc_flags |= ILF_RUNNING;
sc->sc_flags &= ~ILF_RUNNING;
if (! (sc->sc_flags & ILF_RUNNING))
sc->sc_flags &= ~ILF_RUNNING;