mac-timers.h

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/*
 * Copyright (c) 1997 Regents of the University of California.
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 *    notice, this list of conditions and the following disclaimer in the
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 *    must display the following acknowledgement:
 *  This product includes software developed by the Computer Systems
 *  Engineering Group at Lawrence Berkeley Laboratory.
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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);
    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 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__ */

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