threads_1/win32/h/micro_time.hpp

См. документацию.

/*

threads_1: Multithreading support library
Yauheni A. Akhotnikau (C) 2002-2004
eao197@yahoo.com
-------------------------------------------------

Permission is granted to anyone to use this software for any purpose on any
computer system, and to redistribute it freely, subject to the following
restrictions:

1. This software 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.

2. The origin of this software must not be misrepresented, either by
   explicit claim or by omission.

3. Altered versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

-------------------------------------------------

*/
/*
  Threads 1
*/

#ifndef _THREADS_1__WIN32__MICRO_TIME_HPP_
#define _THREADS_1__WIN32__MICRO_TIME_HPP_

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

#include <threads_1/h/micro_time.hpp>

namespace threads_1
{

namespace micro_time
{

inline unix_t
_os_get()
  {
    typedef unsigned __int64 uint64_type;

    // Смещение UNIX-эпохи (1970.01.01 00:00:00) от Win32-эпохи
    // (1601.01.01 00:00:00).
    const uint64_type delta =
      (((uint64_type) 0x019DB1DE) << 32) |
      ((uint64_type) 0xD53E8000);

    // Определяем текущее время.
    FILETIME ft_current;
    GetSystemTimeAsFileTime( &ft_current );

    uint64_type current =
      ((((uint64_type) ft_current.dwHighDateTime) << 32) |
      ((uint64_type) ft_current.dwLowDateTime)) - delta;

    return unix_t(
      // Определяем, сколько прошло секунд.
      (time_t)( ( current ) / 10000000 ),
      // А сколько микросекунд.
      (unsigned long)( ( current % 10000000 + 5 ) / 10 ) );
  }

} /* namespace micro_time */

} /* namespace threads_1 */

#endif

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