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// chrono -*- C++ -*-

// Copyright (C) 2008, 2009 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the

// terms of the GNU General Public License as published by the

// Free Software Foundation; either version 3, or (at your option)

// any later version.

// This library is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// <http://www.gnu.org/licenses/>.

#include <chrono>

#ifdef _GLIBCXX_USE_C99_STDINT_TR1

// conditional inclusion of sys/time.h for gettimeofday

#if !defined(_GLIBCXX_USE_CLOCK_MONOTONIC) && \

    !defined(_GLIBCXX_USE_CLOCK_REALTIME) && \

     defined(_GLIBCXX_USE_GETTIMEOFDAY)

#include <sys/time.h>

#endif

namespace std

{

  namespace chrono

  {

    const bool system_clock::is_monotonic;

    system_clock::time_point

    system_clock::now() throw ()

    {

#ifdef _GLIBCXX_USE_CLOCK_REALTIME

      timespec tp;

      // -EINVAL, -EFAULT

      clock_gettime(CLOCK_REALTIME, &tp);

      return time_point(duration(chrono::seconds(tp.tv_sec)

                                 + chrono::nanoseconds(tp.tv_nsec)));

#elif defined(_GLIBCXX_USE_GETTIMEOFDAY)

      timeval tv;

      // EINVAL, EFAULT

      gettimeofday(&tv, NULL);

      return time_point(duration(chrono::seconds(tv.tv_sec)

                                 + chrono::microseconds(tv.tv_usec)));

#else

      std::time_t __sec = std::time(0);

      return system_clock::from_time_t(__sec);

#endif

    }

#ifdef _GLIBCXX_USE_CLOCK_MONOTONIC

    const bool monotonic_clock::is_monotonic;

    monotonic_clock::time_point

    monotonic_clock::now()

    {

      timespec tp;

      // -EINVAL, -EFAULT

      clock_gettime(CLOCK_MONOTONIC, &tp);

      return time_point(duration(chrono::seconds(tp.tv_sec)

                                 + chrono::nanoseconds(tp.tv_nsec)));

    }

#endif

  }

}

#endif // _GLIBCXX_USE_C99_STDINT_TR1