k3_ringacc_ring_read_occ
ring->state.occ = k3_ringacc_ring_read_occ(ring);
occ = k3_ringacc_ring_read_occ(ring);
ring->state.free = ring->size - k3_ringacc_ring_read_occ(ring);
return k3_ringacc_ring_read_occ(ring);