cv_timedwaitbt
error = cv_timedwaitbt(&sc->sc_intr_cv, &sc->sc_intr_lock, &timeout, &epsilon);
error = cv_timedwaitbt(&sc->sc_intr_cv,
error = cv_timedwaitbt(&sc->sc_cv, &sc->sc_lock, &timeo,
error = cv_timedwaitbt(&sc->sc_intr_cv,
int cv_timedwaitbt(kcondvar_t *, struct kmutex *, struct bintime *,