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/*
* ptw32_relmillisecs.c
*
* Description:
* This translation unit implements miscellaneous thread functions.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2005 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* 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:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifndef _UWIN
//#include <process.h>
#endif
#include "pthread.h"
#include "implement.h"
#ifndef NEED_FTIME
#include <sys/timeb.h>
#endif
DWORD
ptw32_relmillisecs (const struct timespec * abstime)
{
const int64_t NANOSEC_PER_MILLISEC = 1000000;
const int64_t MILLISEC_PER_SEC = 1000;
DWORD milliseconds;
int64_t tmpAbsMilliseconds;
int64_t tmpCurrMilliseconds;
#ifdef NEED_FTIME
struct timespec currSysTime;
FILETIME ft;
SYSTEMTIME st;
#else /* ! NEED_FTIME */
struct _timeb currSysTime;
#endif /* NEED_FTIME */
/*
* Calculate timeout as milliseconds from current system time.
*/
/*
* subtract current system time from abstime in a way that checks
* that abstime is never in the past, or is never equivalent to the
* defined INFINITE value (0xFFFFFFFF).
*
* Assume all integers are unsigned, i.e. cannot test if less than 0.
*/
tmpAbsMilliseconds = (int64_t)abstime->tv_sec * MILLISEC_PER_SEC;
tmpAbsMilliseconds += ((int64_t)abstime->tv_nsec + (NANOSEC_PER_MILLISEC/2)) / NANOSEC_PER_MILLISEC;
/* get current system time */
#ifdef NEED_FTIME
GetSystemTime(&st);
SystemTimeToFileTime(&st, &ft);
/*
* GetSystemTimeAsFileTime(&ft); would be faster,
* but it does not exist on WinCE
*/
ptw32_filetime_to_timespec(&ft, &currSysTime);
tmpCurrMilliseconds = (int64_t)currSysTime.tv_sec * MILLISEC_PER_SEC;
tmpCurrMilliseconds += ((int64_t)currSysTime.tv_nsec + (NANOSEC_PER_MILLISEC/2))
/ NANOSEC_PER_MILLISEC;
#else /* ! NEED_FTIME */
_ftime(&currSysTime);
tmpCurrMilliseconds = (int64_t) currSysTime.time * MILLISEC_PER_SEC;
tmpCurrMilliseconds += (int64_t) currSysTime.millitm;
#endif /* NEED_FTIME */
if (tmpAbsMilliseconds > tmpCurrMilliseconds)
{
milliseconds = (DWORD) (tmpAbsMilliseconds - tmpCurrMilliseconds);
if (milliseconds == INFINITE)
{
/* Timeouts must be finite */
milliseconds--;
}
}
else
{
/* The abstime given is in the past */
milliseconds = 0;
}
return milliseconds;
}
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