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pte_relmillisecs.c
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pte_relmillisecs.c
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/*
* pte_relmillisecs.c
*
* Description:
* This translation unit implements miscellaneous thread functions.
*
* --------------------------------------------------------------------------
*
* Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
* Copyright(C) 2008 Jason Schmidlapp
*
* Contact Email: [email protected]
*
*
* Based upon Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2005 Pthreads-win32 contributors
*
* Contact Email: [email protected]
*
* The original list of contributors to the Pthreads-win32 project
* is contained in the file CONTRIBUTORS.ptw32 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
*/
#include <pte_osal.h>
#include "pthread.h"
#include "implement.h"
unsigned int
pte_relmillisecs (const struct timespec * abstime)
{
const long long NANOSEC_PER_MILLISEC = 1000000;
const long long MILLISEC_PER_SEC = 1000;
unsigned int milliseconds;
long long tmpAbsMilliseconds;
long tmpCurrMilliseconds;
struct timeb currSysTime;
/*
* 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 */
_ftime(&currSysTime);
tmpCurrMilliseconds = (int64_t) currSysTime.time * MILLISEC_PER_SEC;
tmpCurrMilliseconds += (int64_t) currSysTime.millitm;
if (tmpAbsMilliseconds > tmpCurrMilliseconds)
{
milliseconds = (unsigned int) (tmpAbsMilliseconds - tmpCurrMilliseconds);
if (milliseconds == 0xFFFFFFFF)
{
/* Timeouts must be finite */
milliseconds--;
}
}
else
{
/* The abstime given is in the past */
milliseconds = 0;
}
return milliseconds;
}