src/util/Timer.h

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#ifndef TIMER_H
#define TIMER_H

#include <sys/time.h>
#include <unistd.h>

namespace green
{
        class Timer
        {
                protected:
                        bool mTiming;
                        double mStartTime;
                        double mStopTime;
                        
                public:                         
                        virtual ~Timer() {}
                        
                        inline
                        static double GetCurrentTime()
                        {
                                struct timeval tv;
                                // FIXME: check return value of gettimeofday. man page doesn't say what it should be
                                gettimeofday(&tv, NULL);
                                // tv_usec is microseconds, which is 1 millionth of a second
                                // FIXME: gettimeofday is returning not 1/10000 of a second, not microsecond?
                                return (double(tv.tv_sec) + (double(tv.tv_usec) * 0.000001));
                        }

                        Timer() : 
                                        mTiming(false),
                                        mStartTime(Timer::GetCurrentTime()),
                                        mStopTime(0.0)
                        {}
                                                                                                                 
                        virtual inline
                        void StartTiming()
                        {
                                mStartTime = GetCurrentTime();
                                mTiming = true;
                        }               
                        
                        virtual inline
                        void StopTiming()
                        {
                                mTiming = false;
                                mStopTime = GetCurrentTime();
                        }
                        
                        virtual inline
                        bool IsTiming() const {
                                return mTiming;
                        }
                        
                        virtual inline
                        double GetStartTime() const
                        {
                                return mStartTime;
                        }
                        
                        virtual inline
                        double GetStopTime() const
                        {
                                if(mTiming)
                                        return 0.0;
                                else
                                        return mStopTime;
                        }
                        
                        virtual inline
                        double GetTimeDelta() const
                        {
                                if(mTiming)
                                {
                                        double currentDelta = GetCurrentTime() - mStartTime;
                                        return (currentDelta > 0.0 ? currentDelta : 0.0);
                                }
                                else
                                {
                                        double oldDelta = mStopTime - mStartTime;
                                        return (oldDelta > 0.0 ? oldDelta : 0.0);
                                }
                        }
        };
}

#endif

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