// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//==============================================================================
// NOTICE: This file has been modified by Green Hills Software, Inc.  Such
// modifications are subject to copyright by Green Hills Software, Inc.  See the
// "Green Hills Software Modifications" section in the LICENSE.txt included with
// this distribution for more information.
//==============================================================================

#ifndef _LIBCPP___CHRONO_SYSTEM_CLOCK_H
#define _LIBCPP___CHRONO_SYSTEM_CLOCK_H

#include <__chrono/duration.h>
#include <__chrono/time_point.h>
#include <__config>
#include <ctime>
#ifdef __ghs__
extern "C" { long long _Xtime_get_ticks(void); }
#endif

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

#if defined(__ghs__)
  #pragma ghs start_cxx_lib_header
  #pragma ghs startdata
  #if defined(__ghs_max_pack_value)
    #pragma pack (push, __ghs_max_pack_value)
  #endif
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

namespace chrono
{

class _LIBCPP_TYPE_VIS system_clock
{
public:
    typedef microseconds                     duration;
    typedef duration::rep                    rep;
    typedef duration::period                 period;
    typedef chrono::time_point<system_clock> time_point;
    static _LIBCPP_CONSTEXPR_SINCE_CXX14 const bool is_steady = false;

#ifndef __ghs__
    static time_point now() _NOEXCEPT;
    static time_t     to_time_t  (const time_point& __t) _NOEXCEPT;
    static time_point from_time_t(time_t __t) _NOEXCEPT;
#else
    // need to make inlined, because _Xtime_get_ticks() is not always defined.
    static time_point now() _NOEXCEPT { return time_point(microseconds(_Xtime_get_ticks())); }
    // need to be inlined maybe because time_t is not a cross platform
    static time_t     to_time_t  (const time_point& __t) _NOEXCEPT
        { return time_t(_VSTD::chrono::duration_cast<seconds>(__t.time_since_epoch()).count()); }
    static time_point from_time_t(time_t __t) _NOEXCEPT
        { return system_clock::time_point(seconds(__t)); }
#endif
};

#if _LIBCPP_STD_VER > 17

template <class _Duration>
using sys_time    = time_point<system_clock, _Duration>;
using sys_seconds = sys_time<seconds>;
using sys_days    = sys_time<days>;

#endif

} // namespace chrono

_LIBCPP_END_NAMESPACE_STD

#if defined(__ghs__)
  #if defined(__ghs_max_pack_value)
    #pragma pack(pop)
  #endif
  #pragma ghs enddata
  #pragma ghs end_cxx_lib_header
#endif

#endif // _LIBCPP___CHRONO_SYSTEM_CLOCK_H