utilities/include/simpletimer.h

/********************************************************************************
 *  FARSA Utilities Library                                                     *
 *  Copyright (C) 2007-2011 Gianluca Massera <emmegian@yahoo.it>                *
 *                                                                              *
 *  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA  *
 ********************************************************************************/

#ifndef SIMPLETIMER_H
#define SIMPLETIMER_H

#include "utilitiesconfig.h"

#ifdef FARSA_WIN
    #include <windows.h>
#else
    #include <sys/time.h>
#endif

namespace farsa {

class FARSA_UTIL_TEMPLATE SimpleTimer {
public:
    SimpleTimer() {
#ifdef FARSA_WIN
        QueryPerformanceFrequency( &frequency );
        QueryPerformanceCounter( &baseCount );
#else
        struct timeval tv;
        gettimeofday( &tv, NULL );
        lastTime = tv.tv_sec*1000000 + tv.tv_usec;
#endif
    };
    int tac() {
#ifdef FARSA_WIN
        unsigned ticks;
        QueryPerformanceCounter( &count );
        count.QuadPart -= baseCount.QuadPart;
        ticks = unsigned( count.QuadPart * LONGLONG (1000000) / frequency.QuadPart );
        return ticks;
#else
        struct timeval tv;
        gettimeofday( &tv, NULL );
        return (tv.tv_sec*1000000 + tv.tv_usec) - lastTime;
#endif
    };
    int tic() {
#ifdef FARSA_WIN
        unsigned ticks;
        QueryPerformanceCounter( &count );
        count.QuadPart -= baseCount.QuadPart;
        ticks = unsigned( count.QuadPart * LONGLONG (1000000) / frequency.QuadPart );
        baseCount = count;
        return ticks;
#else
        struct timeval tv;
        gettimeofday( &tv, NULL );
        int ret = (tv.tv_sec*1000000 + tv.tv_usec) - lastTime;
        lastTime = (tv.tv_sec*1000000 + tv.tv_usec);
        return ret;
#endif
    };
private:
#ifdef FARSA_WIN
    LARGE_INTEGER count;
    LARGE_INTEGER frequency;
    LARGE_INTEGER baseCount;
#else
    long int lastTime;
#endif
};

} // end namespace farsa

#endif