cb_intr_dist
intr_dist_rem(cb_intr_dist, cb_p);
intr_dist_add(cb_intr_dist, cb_p);
intr_dist_rem(cb_intr_dist, cb_p);
intr_dist_add(cb_intr_dist, cb_p);
intr_dist_rem(cb_intr_dist, cb_p);
extern void cb_intr_dist(void *arg);