/* * 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 INLINE 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; }