clockqueue_next
if (cq->cq_uptime < clockqueue_next(cq))
lateness = start - clockqueue_next(cq);
clockqueue_next(cq) - cq->cq_uptime);
cq->cq_stat.cs_earliness += clockqueue_next(cq) - cq->cq_uptime;
uint64_t clockqueue_next(const struct clockqueue *);
exp = clockqueue_next(cq);