import 15.2.0 Octopus source

[ceph.git] / ceph / src / dmclock / src / dmclock_util.h

// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab

/*
 * Copyright (C) 2017 Red Hat Inc.
 *
 * Author: J. Eric Ivancich <ivancich@redhat.com>
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version
 * 2.1, as published by the Free Software Foundation.  See file
 * COPYING.
 */


#pragma once


#include <unistd.h>
#include <assert.h>
#include <sys/time.h>

#include <limits>
#include <cmath>
#include <chrono>


namespace crimson {
  namespace dmclock {
    // we're using double to represent time, but we could change it by
    // changing the following declarations (and by making sure a min
    // function existed)
    using Time = double;
    static const Time TimeZero = 0.0;
    static const Time TimeMax = std::numeric_limits<Time>::max();
    static const double NaN = nan("");


    inline Time get_time() {
#if defined(__linux__)
      struct timespec now;
      auto result = clock_gettime(CLOCK_REALTIME, &now);
      (void) result; // reference result in case assert is compiled out
      assert(0 == result);
      return now.tv_sec + (now.tv_nsec / 1.0e9);
#else
      struct timeval now;
      auto result = gettimeofday(&now, NULL);
      (void) result; // reference result in case assert is compiled out
      assert(0 == result);
      return now.tv_sec + (now.tv_usec / 1.0e6);
#endif
    }

    std::string format_time(const Time& time, unsigned modulo = 1000);

    void debugger();

  } // namespace dmclock
} // namespace crimson