gearman/libtest/timer.hpp

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 *  Data Differential YATL (i.e. libtest)  library
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#pragma once

#include <cstdlib>
#include <ctime>
#include <iostream>

#ifdef __MACH__
#  include <mach/clock.h>
#  include <mach/mach.h>
#else
#  include <sys/time.h>
#endif


namespace libtest {

class Timer {
public:

  Timer()
  {
    _begin.tv_sec= 0;
    _begin.tv_nsec= 0;
    _end.tv_sec= 0;
    _end.tv_nsec= 0;
  }

  void reset()
  {
    _end.tv_sec= 0;
    _end.tv_nsec= 0;
    _time(_begin);
  }

  void sample()
  {
    _time(_end);
  }

  void offset(int64_t minutes_arg, int64_t seconds_arg, int64_t nanoseconds)
  {
    reset();
    _end= _begin;
    _end.tv_sec+= (minutes_arg * 60) +seconds_arg;
    _end.tv_nsec+= nanoseconds;
  }

  int64_t minutes()
  {
    struct timespec result;
    difference(result);
    return int64_t(result.tv_sec / 60);
  }

  uint64_t elapsed_milliseconds() const
  {
    struct timespec temp;
    difference(temp);

    return temp.tv_sec*1000 +temp.tv_nsec/1000000;
  }

  void difference(struct timespec& arg) const
  {
    if ((_end.tv_nsec -_begin.tv_nsec) < 0)
    {
      arg.tv_sec= _end.tv_sec -_begin.tv_sec -1;
      arg.tv_nsec= 1000000000 +_end.tv_nsec -_begin.tv_nsec;

    }
    else
    {
      arg.tv_sec= _end.tv_sec -_begin.tv_sec;
      arg.tv_nsec= _end.tv_nsec -_begin.tv_nsec;
    }
  }

private:
  void _time(struct timespec& ts)
  {
#ifdef __MACH__ // OSX lacks clock_gettime()
    clock_serv_t _clock_serv;
    mach_timespec_t _mach_timespec;
    host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &_clock_serv);
    clock_get_time(_clock_serv, &_mach_timespec);
    mach_port_deallocate(mach_task_self(), _clock_serv);
    ts.tv_sec= _mach_timespec.tv_sec;
    ts.tv_nsec= _mach_timespec.tv_nsec;
#else
    clock_gettime(CLOCK_REALTIME, &ts);
#endif
  }

private:
  struct timespec _begin;
  struct timespec _end;
};

std::ostream& operator<<(std::ostream& output, const libtest::Timer& arg);

} // namespace libtest