zoneminder/src/zm_timer.h

//
// ZoneMinder Timer Class Interface, $Date$, $Revision$
// Copyright (C) 2001-2008 Philip Coombes
// 
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
// 

#ifndef ZM_TIMER_H
#define ZM_TIMER_H

#include <syscall.h>
#include "zm_thread.h"

#include "zm_exception.h"

class Timer
{
private:
    class TimerException : public Exception
    {
    public:
        TimerException( const std::string &message ) : Exception( stringtf( "(%d) "+message, (long int)syscall(SYS_gettid) ) )
        {
        }
    };

    class TimerThread : public Thread
    {
    private:
        typedef ThreadData<bool> ExpiryFlag;

    private:
        static int mNextTimerId;

    private:
        int mTimerId;
        Timer &mTimer;
        int mDuration;
        int mRepeat;
        int mReset;
        ExpiryFlag mExpiryFlag;
        Mutex mAccessMutex;

    private:
        void quit()
        {
            cancel();
        }

    public:
        TimerThread( Timer &timer, int timeout, bool repeat );
        ~TimerThread();

        void cancel();
        void reset();
        int run();
    };

protected:
    TimerThread mTimerThread;

protected:
    Timer( int timeout, bool repeat=false );

public:
    virtual ~Timer();

protected:
    virtual void expire()=0;

public:
    void cancel();
    void reset();
};

#endif // ZM_TIMER_H