KQ_TIMER_CB_ENQUEUED
if ((kc->flags & KQ_TIMER_CB_ENQUEUED) != 0) {
kc->flags &= ~KQ_TIMER_CB_ENQUEUED;
kc->flags &= ~KQ_TIMER_CB_ENQUEUED;
if ((kc->flags & KQ_TIMER_CB_ENQUEUED) == 0) {
kc->flags |= KQ_TIMER_CB_ENQUEUED;
kc->flags = kc_src->flags & ~KQ_TIMER_CB_ENQUEUED;