OpenSubdiv/examples/common/stopwatch.h

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#ifndef STOPWATCH_H
#define STOPWATCH_H

#if not (_WIN32 or _WIN64)
    #include <sys/types.h>
    #include <sys/time.h>
    #include <sys/resource.h>
#else

#endif

class Stopwatch {

public:

#ifndef _WINDOWS
    void Start() { 
        struct timeval l_rtime;
        gettimeofday(&l_rtime,0);
	    _elapsed = l_rtime.tv_sec + l_rtime.tv_usec/1000000.0;
    }

    void Stop() {
        struct timeval l_rtime;

        gettimeofday(&l_rtime,0);
	    _elapsed = (l_rtime.tv_sec + l_rtime.tv_usec/1000000.0) - _elapsed;
        _totalElapsed += _elapsed;
    }

    double GetElapsed() const {
        return _elapsed;
    }
    
    double GetTotalElapsed() const {
        return _totalElapsed;
    }   
#else
    Stopwatch() {
        QueryPerformanceFrequency(&_frequency);
    }
    
    void Start() 
    { 
        QueryPerformanceCounter(&_time);
    }

    void Stop() 
    { 
        LARGE_INTEGER currentTime;
        QueryPerformanceCounter(&currentTime);
        _elapsed = currentTime.QuadPart - _time.QuadPart;
        _totalElapsed+=_elapsed;
    }

    double GetElapsed() const {
        return (double) _elapsed / _frequency.QuadPart;
    }
    
    double GetTotalElapsed() const {
        return (double) _totalElapsed / _frequency.QuadPart;
    }
#endif

private:

#ifndef _WINDOWS
    double _elapsed;
    double _totalElapsed;
#else
    LARGE_INTEGER _time,
    LARGE_INTEGER _frequency;
    __int64 _elapsed;
    __int64 _totalElapsed;
#endif

};

#endif /* STOPWATCH_H */