TSTATE_STOPPING
sc->taskstate = TSTATE_STOPPING;
if (sc->taskstate == TSTATE_STOPPING) {
sc->taskstate = TSTATE_STOPPING;
if (sc->taskstate == TSTATE_STOPPING) {
sc->sc_taskstate = TSTATE_STOPPING;
if (sc->sc_taskstate == TSTATE_STOPPING) {
sc->sc_taskstate = TSTATE_STOPPING;
if (sc->sc_taskstate == TSTATE_STOPPING) {
sc->sc_taskstate = TSTATE_STOPPING;
if (sc->sc_taskstate == TSTATE_STOPPING) {