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/*
* ptw32_relmillisecs.c
*
* Description:
* This translation unit implements miscellaneous thread functions.
*
* --------------------------------------------------------------------------
*
* Pthreads4w - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 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/
*
* This file is part of Pthreads4w.
*
* Pthreads4w is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pthreads4w 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Pthreads4w. If not, see <http://www.gnu.org/licenses/>. *
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "pthread.h"
#include "implement.h"
static const int64_t NANOSEC_PER_SEC = 1000000000;
static const int64_t NANOSEC_PER_MILLISEC = 1000000;
static const int64_t MILLISEC_PER_SEC = 1000;
#if defined(PTW32_BUILD_INLINED)
INLINE
#endif /* PTW32_BUILD_INLINED */
DWORD
ptw32_relmillisecs (const struct timespec * abstime)
{
DWORD milliseconds;
int64_t tmpAbsNanoseconds;
int64_t tmpCurrNanoseconds;
struct timespec currSysTime;
FILETIME ft;
# if defined(WINCE)
SYSTEMTIME st;
#endif
/*
* 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.
*/
tmpAbsNanoseconds = (int64_t)abstime->tv_nsec + ((int64_t)abstime->tv_sec * NANOSEC_PER_SEC);
/* get current system time */
# if defined(WINCE)
GetSystemTime(&st);
SystemTimeToFileTime(&st, &ft);
# else
GetSystemTimeAsFileTime(&ft);
# endif
ptw32_filetime_to_timespec(&ft, &currSysTime);
tmpCurrNanoseconds = (int64_t)currSysTime.tv_nsec + ((int64_t)currSysTime.tv_sec * NANOSEC_PER_SEC);
if (tmpAbsNanoseconds > tmpCurrNanoseconds)
{
int64_t deltaNanoseconds = tmpAbsNanoseconds - tmpCurrNanoseconds;
if (deltaNanoseconds >= ((int64_t)INFINITE * NANOSEC_PER_MILLISEC))
{
/* Timeouts must be finite */
milliseconds = INFINITE - 1;
}
else
{
milliseconds = (DWORD)(deltaNanoseconds / NANOSEC_PER_MILLISEC);
}
}
else
{
/* The abstime given is in the past */
milliseconds = 0;
}
if (milliseconds == 0 && tmpAbsNanoseconds > tmpCurrNanoseconds) {
/*
* millisecond granularity was too small to represent the wait time.
* return the minimum time in milliseconds.
*/
milliseconds = 1;
}
return milliseconds;
}
/*
* Return the first parameter "abstime" modified to represent the current system time.
* If "relative" is not NULL it represents an interval to add to "abstime".
*/
struct timespec *
pthread_win32_getabstime_np (struct timespec * abstime, const struct timespec * relative)
{
int64_t sec;
int64_t nsec;
struct timespec currSysTime;
FILETIME ft;
/* get current system time */
# if defined(WINCE)
SYSTEMTIME st;
GetSystemTime(&st);
SystemTimeToFileTime(&st, &ft);
# else
GetSystemTimeAsFileTime(&ft);
# endif
ptw32_filetime_to_timespec(&ft, &currSysTime);
sec = currSysTime.tv_sec;
nsec = currSysTime.tv_nsec;
if (NULL != relative)
{
nsec += relative->tv_nsec;
if (nsec >= NANOSEC_PER_SEC)
{
sec++;
nsec -= NANOSEC_PER_SEC;
}
sec += relative->tv_sec;
}
abstime->tv_sec = (time_t) sec;
abstime->tv_nsec = (long) nsec;
return abstime;
}
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