mosesdecoder/mert/Timer.h

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#ifndef MERT_TIMER_H_
#define MERT_TIMER_H_

#include <ostream>
#include <string>
#include <stdint.h>

namespace MosesTuning
{
  

class Timer
{
 private:
  // Time values are stored in microseconds.
  struct CPUTime {
    uint64_t user_time;                 // user CPU time
    uint64_t sys_time;                  // system CPU time

    CPUTime() : user_time(0), sys_time(0) { }
  };

  void GetCPUTimeMicroSeconds(CPUTime* cpu_time) const;

  bool m_is_running;
  uint64_t m_wall;                      // wall-clock time in microseconds
  CPUTime m_start_time;

  // No copying allowed
  Timer(const Timer&);
  void operator=(const Timer&);

 public:
  Timer()
      : m_is_running(false),
        m_wall(0),
        m_start_time() {}

  ~Timer() {}

  void start(const char* msg = 0);

  void restart(const char* msg = 0);

  void check(const char* msg = 0);

  bool is_running() const { return m_is_running; }

  double get_elapsed_cpu_time() const;

  uint64_t get_elapsed_cpu_time_microseconds() const;

  double get_elapsed_wall_time() const;

  uint64_t get_elapsed_wall_time_microseconds() const;

  std::string ToString() const;
};

inline std::ostream& operator<<(std::ostream& os, const Timer& t) {
  if (t.is_running()) {
    os << t.ToString();
  } else {
    os << "timer is not running.";
  }
  return os;
}

}


#endif  // MERT_TIMER_H_

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