knav_queue_is_busy
if (!knav_queue_is_busy(inst)) {
if (!(flags & KNAV_QUEUE_SHARED) && knav_queue_is_busy(inst))
(knav_queue_is_busy(inst) && !knav_queue_is_shared(inst)))
if (knav_queue_is_busy(inst))
if (!knav_queue_is_busy(inst))
if (!knav_queue_is_busy(inst)) {