RING_NUM_FRAMES
.tp_block_nr = RING_NUM_FRAMES,
.tp_frame_nr = RING_NUM_FRAMES,
while (count < RING_NUM_FRAMES && header->tp_status & TP_STATUS_USER) {
if (munmap(rings[1], RING_NUM_FRAMES * getpagesize()) ||
munmap(rings[0], RING_NUM_FRAMES * getpagesize())) {