timer.hh

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#ifndef DUNE_TIMER_HH
#define DUNE_TIMER_HH
 
#ifndef TIMER_USE_STD_CLOCK
// headers for getrusage(2)
#include <sys/resource.h>
#endif
 
#include <ctime>
 
// headers for stderror(3)
#include <cstring>
 
// access to errno in C++
#include <cerrno>
 
#include "exceptions.hh"
 
namespace hdnum {
 
  class TimerError : public SystemError {} ;
   
 
class Timer
{
public:
        Timer () 
        {
          reset();
        }
 
        void reset()
        {
#ifdef TIMER_USE_STD_CLOCK
          cstart = std::clock();
#else
          rusage ru;
          if (getrusage(RUSAGE_SELF, &ru))
            HDNUM_THROW(TimerError, strerror(errno));
          cstart = ru.ru_utime;
#endif
        }
 
        double elapsed () const
        {
#ifdef TIMER_USE_STD_CLOCK
          return (std::clock()-cstart) / static_cast<double>(CLOCKS_PER_SEC);
#else
          rusage ru;
          if (getrusage(RUSAGE_SELF, &ru))
            HDNUM_THROW(TimerError, strerror(errno));
          return 1.0 * (ru.ru_utime.tv_sec - cstart.tv_sec) + (ru.ru_utime.tv_usec - cstart.tv_usec) / (1000.0 * 1000.0);
#endif
        }
    
private:
#ifdef TIMER_USE_STD_CLOCK
  std::clock_t cstart;
#else
  struct timeval cstart;
#endif
}; // end class Timer 
 
} // end namespace
 
#endif