132 lines
4 KiB
C
132 lines
4 KiB
C
/*
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* ptw32_relmillisecs.c
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*
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* Description:
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* This translation unit implements miscellaneous thread functions.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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#if !defined(NEED_FTIME)
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#include <sys/timeb.h>
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#endif
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#if defined(PTW32_BUILD_INLINED)
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INLINE
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#endif /* PTW32_BUILD_INLINED */
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DWORD
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ptw32_relmillisecs (const struct timespec * abstime)
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{
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const int64_t NANOSEC_PER_MILLISEC = 1000000;
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const int64_t MILLISEC_PER_SEC = 1000;
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DWORD milliseconds;
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int64_t tmpAbsMilliseconds;
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int64_t tmpCurrMilliseconds;
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#if defined(NEED_FTIME)
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struct timespec currSysTime;
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FILETIME ft;
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SYSTEMTIME st;
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#else /* ! NEED_FTIME */
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#if ( defined(_MSC_VER) && _MSC_VER >= 1300 ) || \
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( (defined(__MINGW64__) || defined(__MINGW32__)) && __MSVCRT_VERSION__ >= 0x0601 )
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struct __timeb64 currSysTime;
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#else
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struct _timeb currSysTime;
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#endif
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#endif /* NEED_FTIME */
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/*
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* Calculate timeout as milliseconds from current system time.
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*/
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/*
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* subtract current system time from abstime in a way that checks
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* that abstime is never in the past, or is never equivalent to the
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* defined INFINITE value (0xFFFFFFFF).
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*
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* Assume all integers are unsigned, i.e. cannot test if less than 0.
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*/
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tmpAbsMilliseconds = (int64_t)abstime->tv_sec * MILLISEC_PER_SEC;
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tmpAbsMilliseconds += ((int64_t)abstime->tv_nsec + (NANOSEC_PER_MILLISEC/2)) / NANOSEC_PER_MILLISEC;
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/* get current system time */
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#if defined(NEED_FTIME)
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GetSystemTime(&st);
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SystemTimeToFileTime(&st, &ft);
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/*
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* GetSystemTimeAsFileTime(&ft); would be faster,
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* but it does not exist on WinCE
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*/
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ptw32_filetime_to_timespec(&ft, &currSysTime);
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tmpCurrMilliseconds = (int64_t)currSysTime.tv_sec * MILLISEC_PER_SEC;
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tmpCurrMilliseconds += ((int64_t)currSysTime.tv_nsec + (NANOSEC_PER_MILLISEC/2))
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/ NANOSEC_PER_MILLISEC;
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#else /* ! NEED_FTIME */
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#if defined(_MSC_VER) && _MSC_VER >= 1400
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_ftime64_s(&currSysTime);
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#elif ( defined(_MSC_VER) && _MSC_VER >= 1300 ) || \
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( (defined(__MINGW64__) || defined(__MINGW32__)) && __MSVCRT_VERSION__ >= 0x0601 )
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_ftime64(&currSysTime);
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#else
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_ftime(&currSysTime);
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#endif
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tmpCurrMilliseconds = (int64_t) currSysTime.time * MILLISEC_PER_SEC;
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tmpCurrMilliseconds += (int64_t) currSysTime.millitm;
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#endif /* NEED_FTIME */
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if (tmpAbsMilliseconds > tmpCurrMilliseconds)
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{
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milliseconds = (DWORD) (tmpAbsMilliseconds - tmpCurrMilliseconds);
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if (milliseconds == INFINITE)
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{
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/* Timeouts must be finite */
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milliseconds--;
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}
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}
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else
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{
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/* The abstime given is in the past */
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milliseconds = 0;
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}
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return milliseconds;
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}
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