USEC_PER_SEC
while (ad->ad_timestamp.tv_usec >= USEC_PER_SEC) {
ad->ad_timestamp.tv_usec -= USEC_PER_SEC;
if ((u_long)timestamp.tv_usec >= USEC_PER_SEC) {
USEC_PER_SEC /* to MHz */);
USEC_PER_SEC /* to MHz */);
__end.tv_sec = (_to) / USEC_PER_SEC; \
__end.tv_usec = (_to) % USEC_PER_SEC; \
__end.tv_sec = (_to) / USEC_PER_SEC; \
__end.tv_usec = (_to) % USEC_PER_SEC; \
return j * (USEC_PER_SEC / HZ);