timer.h

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#ifndef TIMER_H
#define TIMER_H

#include <stdlib.h>

#ifdef WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#else
 #ifndef __USE_BSD
 #define __USE_BSD
 #endif
#include <time.h>
#include <sys/time.h>
#endif

#ifdef WIN32
double PCFreq = 0.0;
__int64 timerStart = 0;
#else
struct timeval timerStart;
#endif

void StartTimer()
{
#ifdef WIN32
    LARGE_INTEGER li;
    if(!QueryPerformanceFrequency(&li))
        printf("QueryPerformanceFrequency failed!\n");

    PCFreq = (double)li.QuadPart/1000.0;

    QueryPerformanceCounter(&li);
    timerStart = li.QuadPart;
#else
    gettimeofday(&timerStart, NULL);
#endif
}

// time elapsed in ms
double GetTimer()
{
#ifdef WIN32
    LARGE_INTEGER li;
    QueryPerformanceCounter(&li);
    return (double)(li.QuadPart-timerStart)/PCFreq;
#else
    struct timeval timerStop, timerElapsed;
    gettimeofday(&timerStop, NULL);
    timersub(&timerStop, &timerStart, &timerElapsed);
    return timerElapsed.tv_sec*1000.0+timerElapsed.tv_usec/1000.0;
#endif
}

#endif // TIMER_H