SLEEP_DURATION_HI
usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
SLEEP_DURATION_HI);
SLEEP_DURATION_HI);
usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
SLEEP_DURATION_HI, MAX_COUNT);