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/Users/yzchen/ns/ns-allinone-2.33/ns-2.33/imep/rxmit_queue.h

00001 /* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
00002 /*
00003  * Copyright (c) 1997 Regents of the University of California.
00004  * All rights reserved.
00005  *
00006  * Redistribution and use in source and binary forms, with or without
00007  * modification, are permitted provided that the following conditions
00008  * are met:
00009  * 1. Redistributions of source code must retain the above copyright
00010  *    notice, this list of conditions and the following disclaimer.
00011  * 2. Redistributions in binary form must reproduce the above copyright
00012  *    notice, this list of conditions and the following disclaimer in the
00013  *    documentation and/or other materials provided with the distribution.
00014  * 3. All advertising materials mentioning features or use of this software
00015  *    must display the following acknowledgement:
00016  *      This product includes software developed by the Computer Systems
00017  *      Engineering Group at Lawrence Berkeley Laboratory.
00018  * 4. Neither the name of the University nor of the Laboratory may be used
00019  *    to endorse or promote products derived from this software without
00020  *    specific prior written permission.
00021  *
00022  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
00023  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00024  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00025  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
00026  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00027  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00028  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00029  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00030  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00031  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00032  * SUCH DAMAGE.
00033  */
00034 /* Ported from CMU/Monarch's code*/
00035 
00036 /* -*- c++ -*-
00037    rexmit_queue.h
00038    $Id: rxmit_queue.h,v 1.4 2002/05/06 22:23:15 difa Exp $
00039    */
00040 
00041 #ifndef imep_rexmit_queue_h
00042 #define imep_rexmit_queue_h
00043 
00044 #include <packet.h>
00045 #include "lib/bsd-list.h"
00046 
00047 typedef double Time;
00048 
00049 struct rexent {
00050   double rexmit_at;
00051   int rexmits_left;
00052   Packet *p;
00053   LIST_ENTRY(struct rexent) next;
00054 };
00055 
00056 LIST_HEAD(rexent_head, rexent);
00057 
00058 class ReXmitQ;
00059 
00060 class ReXmitQIter {
00061   friend class ReXmitQ;
00062   
00063 public:
00064   inline Packet * next() {
00065     if (0 == iter) return 0;
00066     struct rexent *t = iter;
00067     iter = iter->next.le_next;
00068     return t->p;
00069   }
00070   
00071 private:
00072   ReXmitQIter(rexent *r) : iter(r) {};
00073   struct rexent * iter;
00074 };
00075 
00076 class ReXmitQ {
00077 public:
00078   ReXmitQ();
00079   
00080   void insert(Time rxat, Packet *p, int num_rexmits);
00081   void peekHead(Time *rxat, Packet **pp, int *rexmits_left);
00082   void removeHead();
00083   void remove(Packet *p);
00084   inline ReXmitQIter iter() {
00085     return ReXmitQIter(head.lh_first); 
00086   }
00087 
00088 private:
00089   rexent_head head;
00090 };
00091 
00092 #endif

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