tnt_stopwatch.h

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/*
*
* Mathematical and Computational Sciences Division
* National Institute of Technology,
* Gaithersburg, MD USA
*
*
* This software was developed at the National Institute of Standards and
* Technology (NIST) by employees of the Federal Government in the course
* of their official duties. Pursuant to title 17 Section 105 of the
* United States Code, this software is not subject to copyright protection
* and is in the public domain.  NIST assumes no responsibility whatsoever for
* its use by other parties, and makes no guarantees, expressed or implied,
* about its quality, reliability, or any other characteristic.
*
*/



#ifndef STOPWATCH_H
#define STOPWATCH_H

// for clock() and CLOCKS_PER_SEC
#include <time.h>


namespace TNT
{

inline static double seconds(void)
{
    const double secs_per_tick = 1.0 / CLOCKS_PER_SEC;
    return ( (double) clock() ) * secs_per_tick;
}

class Stopwatch {
    private:
        int running_;
        double start_time_;
        double total_;

    public:
        inline Stopwatch();
        inline void start();
        inline double stop();
                inline double read();
                inline void resume();
                inline int running();
};

inline Stopwatch::Stopwatch() : running_(0), start_time_(0.0), total_(0.0) {}

void Stopwatch::start() 
{
        running_ = 1;
        total_ = 0.0;
        start_time_ = seconds();
}

double Stopwatch::stop()  
{
        if (running_) 
        {
         total_ += (seconds() - start_time_); 
         running_ = 0;
    }
    return total_; 
}

inline void Stopwatch::resume()
{
        if (!running_)
        {
                start_time_ = seconds();
                running_ = 1;
        }
}
                

inline double Stopwatch::read()   
{
        if (running_)
        {
                stop();
                resume();
        }
        return total_;
}


} /* TNT namespace */
#endif