/Users/yzchen/ns/ns-allinone-2.33/ns-2.33/mac/mac-timers.h

/* -*-  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
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 */
/* Ported from CMU/Monarch's code, nov'98 -Padma.*/

#ifndef __mac_timers_h__
#define __mac_timers_h__

/* ======================================================================
   Timers
   ====================================================================== */
class Mac802_11;

class MacTimer : public Handler {
public:
        MacTimer(Mac802_11* m) : mac(m) {
                busy_ = paused_ = 0; stime = rtime = 0.0;
        }

        virtual void handle(Event *e) = 0;

        virtual void start(double time);
        virtual void stop(void);
        virtual void pause(void) { assert(0); }
        virtual void resume(void) { assert(0); }

        inline int busy(void) { return busy_; }
        inline int paused(void) { return paused_; }
        inline double expire(void) {
                return ((stime + rtime) - Scheduler::instance().clock());
        }

protected:
        Mac802_11       *mac;
        int             busy_;
        int             paused_;
        Event           intr;
        double          stime;  // start time
        double          rtime;  // remaining time
};


class BackoffTimer : public MacTimer {
public:
        BackoffTimer(Mac802_11 *m) : MacTimer(m), difs_wait(0.0) {}



        void    start(int cw, int idle, double difs = 0.0);
        void    handle(Event *e);
        void    pause(void);
        void    resume(double difs);
private:
        double  difs_wait;
};

class DeferTimer : public MacTimer {
public:
        DeferTimer(Mac802_11 *m) : MacTimer(m) {}

        void    start(double);
        void    handle(Event *e);
};

class BeaconTimer : public MacTimer {
public:
        BeaconTimer(Mac802_11 *m) : MacTimer(m) {}

        void    start(double);
        void    handle(Event *e);
};

class ProbeTimer : public MacTimer {
public:
        ProbeTimer(Mac802_11 *m) : MacTimer(m) {}

        void    start(double);
        void    handle(Event *e);
};


class IFTimer : public MacTimer {
public:
        IFTimer(Mac802_11 *m) : MacTimer(m) {}

        void    handle(Event *e);
};

class NavTimer : public MacTimer {
public:
        NavTimer(Mac802_11 *m) : MacTimer(m) {}

        void    handle(Event *e);
};

class RxTimer : public MacTimer {
public:
        RxTimer(Mac802_11 *m) : MacTimer(m) {}

        void    handle(Event *e);
};

class TxTimer : public MacTimer {
public:
        TxTimer(Mac802_11 *m) : MacTimer(m) {}

        void    handle(Event *e);
};

#endif /* __mac_timers_h__ */