il_queue_inc_wrap
q->write_ptr = il_queue_inc_wrap(q->write_ptr, q->n_bd);
for (idx = il_queue_inc_wrap(idx, q->n_bd); q->read_ptr != idx;
q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd)) {
q->write_ptr = il_queue_inc_wrap(q->write_ptr, q->n_bd);
for (idx = il_queue_inc_wrap(idx, q->n_bd); q->read_ptr != idx;
q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd)) {
q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd);
q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd);
q->write_ptr = il_queue_inc_wrap(q->write_ptr, q->n_bd);
for (idx = il_queue_inc_wrap(idx, q->n_bd); q->read_ptr != idx;
q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd)) {