msg_peek(): New function.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@241 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/kern/msg.h b/kern/msg.h
index d9b06707cc37d62be7427eaf2824650cc43c4664..dbd73e839664c52a68af840c150126be2435623d 100755 (executable)
--- a/kern/msg.h
+++ b/kern/msg.h
@@ -18,6 +18,9 @@
 
 /*#*
  *#* $Log$
+ *#* Revision 1.4  2004/10/19 08:22:09  bernie
+ *#* msg_peek(): New function.
+ *#*
  *#* Revision 1.3  2004/08/25 14:12:09  rasky
  *#* Aggiornato il comment block dei log RCS
  *#*
@@ -70,6 +73,15 @@ INLINE Msg* msg_get(MsgPort* port)
        return (Msg*)REMHEAD(&port->queue);
 }
 
+/* Peek the first message in the queue of \a port, or NULL if the port is empty */
+INLINE Msg *msg_peek(MsgPort *port)
+{
+       if (ISLISTEMPTY(&port->queue))
+               return NULL;
+
+       return (Msg *)port->queue.head;
+}
+
 /*! Send back (reply) \a msg to its sender */
 INLINE void msg_reply(Msg* msg)
 {