This function returns the amount of in-flight packets for the vhost
queue using async acceleration.
+* ``rte_vhost_clear_queue_thread_unsafe(vid, queue_id, **pkts, count)``
+
+ Clear inflight packets which are submitted to DMA engine in vhost async data
+ path. Completed packets are returned to applications through ``pkts``.
+
Vhost-user Implementations
--------------------------