monotonic_clock.h

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// Copyright (C) 2013-2015 iFunFactory Inc. All Rights Reserved.
//
// This work is confidential and proprietary to iFunFactory Inc. and
// must not be used, disclosed, copied, or distributed without the prior
// consent of iFunFactory Inc.

#ifndef INCLUDE_FUNAPI_TIME_MONOTONIC_CLOCK_H_
#define INCLUDE_FUNAPI_TIME_MONOTONIC_CLOCK_H_

#include <stdint.h>
#include <time.h>

namespace fun {

class MonotonicClock {
 public:
  typedef int64_t Value;

  typedef int64_t Duration;

  static void ToTimespec(const Value &value, struct timespec *ret) {
    ret->tv_sec = value / (1000 * 1000);
    ret->tv_nsec = value % (1000 * 1000) * 1000;
  }

  static Duration FromSec(int64_t sec) {
    return sec * 1000 * 1000;
  }

  static Duration FromMsec(int64_t msec) {
    return msec * 1000;
  }

  static Duration FromUsec(int64_t usec) {
    return usec;
  }

  static Value Now() {
    struct timespec now;
    clock_gettime(CLOCK_MONOTONIC, &now);
    return now.tv_sec * 1000 * 1000 + now.tv_nsec / 1000;
  }

 private:
  MonotonicClock() { }
};

}  // namespace fun

#endif  // INCLUDE_FUNAPI_TIME_MONOTONIC_CLOCK_H_