ptw32_timespec.c

/*
 * ptw32_timespec.c
 *
 * Description:
 * This translation unit implements routines which are private to
 * the implementation and may be used throughout it.
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads4w - POSIX Threads for Windows
 *      Copyright 1998 John E. Bossom
 *      Copyright 1999-2018, Pthreads4w contributors
 *
 *      Homepage: https://sourceforge.net/projects/pthreads4w/
 *
 *      The current list of contributors is contained
 *      in the file CONTRIBUTORS included with the source
 *      code distribution. The list can also be seen at the
 *      following World Wide Web location:
 *
 *      https://sourceforge.net/p/pthreads4w/wiki/Contributors/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "pthread.h"
#include "implement.h"

/*
 * time between jan 1, 1601 and jan 1, 1970 in units of 100 nanoseconds
 */
#define  __PTW32_TIMESPEC_TO_FILETIME_OFFSET \
	  ( ((uint64_t) 27111902UL << 32) + (uint64_t) 3577643008UL )

INLINE void
__ptw32_timespec_to_filetime (const struct timespec *ts, FILETIME * ft)
     /*
      * -------------------------------------------------------------------
      * converts struct timespec
      * where the time is expressed in seconds and nanoseconds from Jan 1, 1970.
      * into FILETIME (as set by GetSystemTimeAsFileTime), where the time is
      * expressed in 100 nanoseconds from Jan 1, 1601,
      * -------------------------------------------------------------------
      */
{
  *(uint64_t *) ft = ts->tv_sec * 10000000UL
    + (ts->tv_nsec + 50) / 100 +  __PTW32_TIMESPEC_TO_FILETIME_OFFSET;
}

INLINE void
__ptw32_filetime_to_timespec (const FILETIME * ft, struct timespec *ts)
     /*
      * -------------------------------------------------------------------
      * converts FILETIME (as set by GetSystemTimeAsFileTime), where the time is
      * expressed in 100 nanoseconds from Jan 1, 1601,
      * into struct timespec
      * where the time is expressed in seconds and nanoseconds from Jan 1, 1970.
      * -------------------------------------------------------------------
      */
{
  ts->tv_sec =
    (int) ((*(uint64_t *) ft -  __PTW32_TIMESPEC_TO_FILETIME_OFFSET) / 10000000UL);
  ts->tv_nsec =
    (int) ((*(uint64_t *) ft -  __PTW32_TIMESPEC_TO_FILETIME_OFFSET -
	    ((uint64_t) ts->tv_sec * (uint64_t) 10000000UL)) * 100);
}