native_client_sdk/src/libraries/third_party/pthreads-win32/ptw32_timespec.c

   1 /*
   2  * ptw32_timespec.c
   3  *
   4  * Description:
   5  * This translation unit implements routines which are private to
   6  * the implementation and may be used throughout it.
   7  *
   8  * --------------------------------------------------------------------------
   9  *
  10  *      Pthreads-win32 - POSIX Threads Library for Win32
  11  *      Copyright(C) 1998 John E. Bossom
  12  *      Copyright(C) 1999,2005 Pthreads-win32 contributors
  13  *
  14  *      Contact Email: rpj@callisto.canberra.edu.au
  15  *
  16  *      The current list of contributors is contained
  17  *      in the file CONTRIBUTORS included with the source
  18  *      code distribution. The list can also be seen at the
  19  *      following World Wide Web location:
  20  *      http://sources.redhat.com/pthreads-win32/contributors.html
  21  *
  22  *      This library is free software; you can redistribute it and/or
  23  *      modify it under the terms of the GNU Lesser General Public
  24  *      License as published by the Free Software Foundation; either
  25  *      version 2 of the License, or (at your option) any later version.
  26  *
  27  *      This library is distributed in the hope that it will be useful,
  28  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  29  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  30  *      Lesser General Public License for more details.
  31  *
  32  *      You should have received a copy of the GNU Lesser General Public
  33  *      License along with this library in the file COPYING.LIB;
  34  *      if not, write to the Free Software Foundation, Inc.,
  35  *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  36  */
  37
  38 #include "pthread.h"
  39 #include "implement.h"
  40
  41
  42 #if defined(NEED_FTIME)
  43
  44 /*
  45  * time between jan 1, 1601 and jan 1, 1970 in units of 100 nanoseconds
  46  */
  47 #define PTW32_TIMESPEC_TO_FILETIME_OFFSET \
  48           ( ((int64_t) 27111902 << 32) + (int64_t) 3577643008 )
  49
  50 INLINE void
  51 ptw32_timespec_to_filetime (const struct timespec *ts, FILETIME * ft)
  52      /*
  53       * -------------------------------------------------------------------
  54       * converts struct timespec
  55       * where the time is expressed in seconds and nanoseconds from Jan 1, 1970.
  56       * into FILETIME (as set by GetSystemTimeAsFileTime), where the time is
  57       * expressed in 100 nanoseconds from Jan 1, 1601,
  58       * -------------------------------------------------------------------
  59       */
  60 {
  61   *(int64_t *) ft = ts->tv_sec * 10000000
  62     + (ts->tv_nsec + 50) / 100 + PTW32_TIMESPEC_TO_FILETIME_OFFSET;
  63 }
  64
  65 INLINE void
  66 ptw32_filetime_to_timespec (const FILETIME * ft, struct timespec *ts)
  67      /*
  68       * -------------------------------------------------------------------
  69       * converts FILETIME (as set by GetSystemTimeAsFileTime), where the time is
  70       * expressed in 100 nanoseconds from Jan 1, 1601,
  71       * into struct timespec
  72       * where the time is expressed in seconds and nanoseconds from Jan 1, 1970.
  73       * -------------------------------------------------------------------
  74       */
  75 {
  76   ts->tv_sec =
  77     (int) ((*(int64_t *) ft - PTW32_TIMESPEC_TO_FILETIME_OFFSET) / 10000000);
  78   ts->tv_nsec =
  79     (int) ((*(int64_t *) ft - PTW32_TIMESPEC_TO_FILETIME_OFFSET -
  80             ((int64_t) ts->tv_sec * (int64_t) 10000000)) * 100);
  81 }
  82
  83 #endif /* NEED_FTIME */