Add uc_wqueue_flush() to immedately preform mbuf writes

include/ucore/wqueue.h

@@ -103,4 +103,21 @@ int uc_wqueue_clear(struct UCWQueue *wqueue);
  */
 int uc_wqueue_enqueue(struct UCWQueue *wqueue, struct MBuf *mbuf);
 
+
+/**
+ *  Immediately write mbufs.
+ *  This invokes the wqueue write callback immediately, just as if an
+ *  write event from the IOMux had happened.
+ *  
+ *  As for a normal write event, the entire queue might not be 
+ *  written, if the associated write callback detectes it cannot write
+ *  more data.
+ *
+ *  @param wqueue
+ *
+ *  return 0 if no error occured, -1 if the write callback returned
+ *  UC_WQ_ABORT
+ */
+int uc_wqueue_flush(struct UCWQueue *wqueue);
+
 #endif