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-rw-r--r--semaphore_timedwait.c197
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diff --git a/semaphore_timedwait.c b/semaphore_timedwait.c
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-/*
- * -------------------------------------------------------------
- *
- * Module: semaphore_timedwait.c
- *
- * Purpose:
- * Semaphores aren't actually part of the PThreads standard.
- * They are defined by the POSIX Standard:
- *
- * POSIX 1003.1b-1993 (POSIX.1b)
- *
- * -------------------------------------------------------------
- *
- * --------------------------------------------------------------------------
- *
- * Pthreads-win32 - POSIX Threads Library for Win32
- * Copyright(C) 1998 John E. Bossom
- * Copyright(C) 1999,2002 Pthreads-win32 contributors
- *
- * Contact Email: rpj@ise.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
-#ifndef NEED_FTIME
-#include <sys/timeb.h>
-#endif
-
-#include "pthread.h"
-#include "semaphore.h"
-#include "implement.h"
-
-
-int
-sem_timedwait (sem_t * sem, const struct timespec * abstime)
- /*
- * ------------------------------------------------------
- * DOCPUBLIC
- * This function waits on a semaphore possibly until
- * 'abstime' time.
- *
- * PARAMETERS
- * sem
- * pointer to an instance of sem_t
- *
- * abstime
- * pointer to an instance of struct timespec
- *
- * DESCRIPTION
- * This function waits on a semaphore. If the
- * semaphore value is greater than zero, it decreases
- * its value by one. If the semaphore value is zero, then
- * the calling thread (or process) is blocked until it can
- * successfully decrease the value or until interrupted by
- * a signal.
- *
- * If 'abstime' is a NULL pointer then this function will
- * block until it can successfully decrease the value or
- * until interrupted by a signal.
- *
- * RESULTS
- * 0 successfully decreased semaphore,
- * -1 failed, error in errno
- * ERRNO
- * EINVAL 'sem' is not a valid semaphore,
- * ENOSYS semaphores are not supported,
- * EINTR the function was interrupted by a signal,
- * EDEADLK a deadlock condition was detected.
- * ETIMEDOUT abstime elapsed before success.
- *
- * ------------------------------------------------------
- */
-{
- int result = 0;
-
-#ifdef NEED_FTIME
-
- struct timespec currSysTime;
-
-#else /* NEED_FTIME */
-
- struct _timeb currSysTime;
-
-#endif /* NEED_FTIME */
-
- const DWORD NANOSEC_PER_MILLISEC = 1000000;
- const DWORD MILLISEC_PER_SEC = 1000;
- DWORD milliseconds;
-
- if (sem == NULL)
- {
- result = EINVAL;
- }
- else
- {
- if (abstime == NULL)
- {
- milliseconds = INFINITE;
- }
- else
- {
- /*
- * Calculate timeout as milliseconds from current system time.
- */
-
- /* get current system time */
-
-#ifdef NEED_FTIME
-
- {
- FILETIME ft;
- SYSTEMTIME st;
-
- GetSystemTime(&st);
- SystemTimeToFileTime(&st, &ft);
- /*
- * GetSystemTimeAsFileTime(&ft); would be faster,
- * but it does not exist on WinCE
- */
-
- filetime_to_timespec(&ft, &currSysTime);
- }
-
- /*
- * subtract current system time from abstime
- */
- milliseconds = (abstime->tv_sec - currSysTime.tv_sec) * MILLISEC_PER_SEC;
- milliseconds += ((abstime->tv_nsec - currSysTime.tv_nsec) + (NANOSEC_PER_MILLISEC/2)) / NANOSEC_PER_MILLISEC;
-
-#else /* NEED_FTIME */
- _ftime(&currSysTime);
-
- /*
- * subtract current system time from abstime
- */
- milliseconds = (abstime->tv_sec - currSysTime.time) * MILLISEC_PER_SEC;
- milliseconds += ((abstime->tv_nsec + (NANOSEC_PER_MILLISEC/2)) / NANOSEC_PER_MILLISEC) -
- currSysTime.millitm;
-
-#endif /* NEED_FTIME */
-
-
- if (((int) milliseconds) < 0)
- milliseconds = 0;
- }
-
-#ifdef NEED_SEM
-
- result = (pthreadCancelableTimedWait ((*sem)->event, milliseconds));
-
-#else /* NEED_SEM */
-
- result = (pthreadCancelableTimedWait ((*sem)->sem, milliseconds));
-
-#endif
-
- }
-
- if (result != 0)
- {
-
- errno = result;
- return -1;
-
- }
-
-#ifdef NEED_SEM
-
- ptw32_decrease_semaphore(sem);
-
-#endif /* NEED_SEM */
-
- return 0;
-
-} /* sem_timedwait */