priq.h

在NS2仿真软件（2.28）下

//* -*-	Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * Copyright (c) 1997 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the Computer Systems
 *	Engineering Group at Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
//   A simple priority queue with a remove packet function
#ifndef _priq_11e_h
#define _priq_11e_h

//#include "object.h"
//#include "queue.h"
#include "d-tail.h"
#include "packet.h"
#include "lib/bsd-list.h"

#define MAX_Q 4 
#define PKT_LEVEL(p) HDR_IP(p)->prio()

class PriQ;

typedef int (*PacketFilter)(Packet *, void *);

LIST_HEAD(PriQ_List, PriQ);

class PriQ : public DTail {

public:
    PriQ();
    int     command(int argc, const char*const* argv);
    void    recv(Packet *p, Handler *h);
    void    pri_recv(Packet *p, Handler *h);
    void    recvHighPriority(Packet *, Handler *);
    // insert packet at front of queue
    void filter(PacketFilter filter, void * data);
    // apply filter to each packet in queue, 
    // - if filter returns 0 leave packet in queue
    // - if filter returns 1 remove packet from queue
    
    Packet* filter(nsaddr_t id);
    DTail   pri_[MAX_Q];
    void    Terminate(void);
    int     getLevels();
    
private:
    int Prefer_Routing_Protocols;
    int max_levels;
    int level;
    int levels;
    int flag;
    int cntl;
        /*
	 * A global list of Interface Queues.  I use this list to iterate
	 * over all of the queues at the end of the simulation and flush
	 * their contents. - josh
	 */
public:
    LIST_ENTRY(PriQ) link;
    static struct PriQ_List prhead;
};

#endif /* !_priq_11e_h */