passivetimer.cpp

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/////////////////////////////////////////////////////////////////////////////
// $Id: passivetimer.cpp,v 1.7 2001/05/27 12:48:20 rosimildo Exp $
//
// Copyright (c) 1996-2000 ConnectTel, Inc. All rights reserved.
// Permission to copy, use, modify, sell and distribute this software is
// granted provided this copyright notice appears in all copies at the top.
//  
// MODULE DESCRIPTION:
// This module implements a passive timer used to check if a timeout 
// has been elapsed. The basic idea is to have a "free-running-counter"
// with increments in milliseconds. Internally the class keep the 
// difference of the counter of two points in time.
//
// MODIFICATION/HISTORY:
//
// $Log: passivetimer.cpp,v $
// Revision 1.7  2001/05/27 12:48:20  rosimildo
// Updated to get passive timer working on Linux.
//
// Revision 1.6  2001/03/17 23:33:03  rosimildo
// Compiled with VC++.
//
// Revision 1.5  2001/03/13 03:00:50  rosimildo
// Updated to work under Ecos.
//
//
// Created 2001. Rosimildo da Silva, ConnectTel Inc. [[e-mail]]
/////////////////////////////////////////////////////////////////////////////


/**
 * This timer class could be used to set timeouts, alarms and others
 * periodical events that might happen in your system.
 *
 * @version    1.0, 06/19/96
 * @author     Rosimildo da Silva
 */

#include <stdio.h>
#include <time.h>
// could not get clock() working on linux...
#ifdef __linux__
#include <sys/timeb.h>
#endif
#include "passivetimer.h"


PassiveTimer::PassiveTimer(unsigned long duration)
{
    interval = duration;
    reset(); 
}

void PassiveTimer::setNewInterval(unsigned long duration)
{
    interval = duration;  
    reset(); 
}

/**
* Make the current time to be the begin of the interval to be measured.
*/
void PassiveTimer::reset()
{
    initialRef = getMsecs();
}
    
/**
* Check if the time elapsed is longer than the one specified
* by the parameter.
* @param tm - interval to be checked against.
* @return true - it has timed out; false - it has not timed out;
*/
bool PassiveTimer::timed_out() const
{

    if(getMsecs() - initialRef >= interval) 
        return true;
    else
        return false;
}

unsigned long PassiveTimer::elapsed() const
{
    return getMsecs() - initialRef;
}

unsigned long PassiveTimer::getMsecs()
{
#ifdef __linux__
   struct timeb tb;
   ftime( &tb );
	return (tb.time*1000+tb.millitm);
#else
   return ( ( clock()*1000 )/CLOCKS_PER_SEC );
#endif
}