| /* |
| * 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 |
| */ |
| |
| #include "pthread.h" |
| #include "implement.h" |
| #if !defined(NEED_FTIME) |
| #include <sys/timeb.h> |
| #endif |
| |
| |
| #if defined(PTW32_BUILD_INLINED) |
| INLINE |
| #endif /* PTW32_BUILD_INLINED */ |
| 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; |
| #if defined(NEED_FTIME) |
| struct timespec currSysTime; |
| FILETIME ft; |
| SYSTEMTIME st; |
| #else /* ! NEED_FTIME */ |
| #if ( defined(_MSC_VER) && _MSC_VER >= 1300 ) || \ |
| ( (defined(__MINGW64__) || defined(__MINGW32__)) && __MSVCRT_VERSION__ >= 0x0601 ) |
| struct __timeb64 currSysTime; |
| #else |
| struct _timeb currSysTime; |
| #endif |
| #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 */ |
| |
| #if defined(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 */ |
| |
| #if defined(_MSC_VER) && _MSC_VER >= 1400 |
| _ftime64_s(&currSysTime); |
| #elif ( defined(_MSC_VER) && _MSC_VER >= 1300 ) || \ |
| ( (defined(__MINGW64__) || defined(__MINGW32__)) && __MSVCRT_VERSION__ >= 0x0601 ) |
| _ftime64(&currSysTime); |
| #else |
| _ftime(&currSysTime); |
| #endif |
| |
| 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; |
| } |