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-rw-r--r--semaphore_trywait.c110
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diff --git a/semaphore_trywait.c b/semaphore_trywait.c
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-/*
- * -------------------------------------------------------------
- *
- * Module: semaphore.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
- */
-
-#include "pthread.h"
-#include "semaphore.h"
-#include "implement.h"
-
-
-int
-sem_trywait (sem_t * sem)
- /*
- * ------------------------------------------------------
- * DOCPUBLIC
- * This function tries to wait on a semaphore.
- *
- * PARAMETERS
- * sem
- * pointer to an instance of sem_t
- *
- * DESCRIPTION
- * This function tries to wait on a semaphore. If the
- * semaphore value is greater than zero, it decreases
- * its value by one. If the semaphore value is zero, then
- * this function returns immediately with the error EAGAIN
- *
- * RESULTS
- * 0 successfully decreased semaphore,
- * -1 failed, error in errno
- * ERRNO
- * EAGAIN the semaphore was already locked,
- * EINVAL 'sem' is not a valid semaphore,
- * ENOTSUP sem_trywait is not supported,
- * EINTR the function was interrupted by a signal,
- * EDEADLK a deadlock condition was detected.
- *
- * ------------------------------------------------------
- */
-{
-#ifdef NEED_SEM
-
- /*
- * not yet implemented!
- */
- errno = ENOTSUP;
- return -1;
-
-#else /* NEED_SEM */
-
- int result = 0;
-
- if (sem == NULL || *sem == NULL)
- {
- result = EINVAL;
- }
- else if (WaitForSingleObject ((*sem)->sem, 0) == WAIT_TIMEOUT)
- {
- result = EAGAIN;
- }
-
- if (result != 0)
- {
- errno = result;
- return -1;
- }
-
- return 0;
-
-#endif /* NEED_SEM */
-
-} /* sem_trywait */