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-rw-r--r--pthreads/src/sem_wait.c187
1 files changed, 0 insertions, 187 deletions
diff --git a/pthreads/src/sem_wait.c b/pthreads/src/sem_wait.c
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--- a/pthreads/src/sem_wait.c
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-/*
- * -------------------------------------------------------------
- *
- * Module: sem_wait.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) 1999,2005 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 "semaphore.h"
-#include "implement.h"
-
-
-static void PTW32_CDECL
-ptw32_sem_wait_cleanup(void * sem)
-{
- sem_t s = (sem_t) sem;
-
- if (pthread_mutex_lock (&s->lock) == 0)
- {
- /*
- * If sema is destroyed do nothing, otherwise:-
- * If the sema is posted between us being cancelled and us locking
- * the sema again above then we need to consume that post but cancel
- * anyway. If we don't get the semaphore we indicate that we're no
- * longer waiting.
- */
- if (*((sem_t *)sem) != NULL && !(WaitForSingleObject(s->sem, 0) == WAIT_OBJECT_0))
- {
- ++s->value;
-#if defined(NEED_SEM)
- if (s->value > 0)
- {
- s->leftToUnblock = 0;
- }
-#else
- /*
- * Don't release the W32 sema, it doesn't need adjustment
- * because it doesn't record the number of waiters.
- */
-#endif /* NEED_SEM */
- }
- (void) pthread_mutex_unlock (&s->lock);
- }
-}
-
-int
-sem_wait (sem_t * sem)
- /*
- * ------------------------------------------------------
- * DOCPUBLIC
- * This function waits on a semaphore.
- *
- * PARAMETERS
- * sem
- * pointer to an instance of sem_t
- *
- * 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.
- *
- * 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.
- *
- * ------------------------------------------------------
- */
-{
- int result = 0;
- sem_t s = *sem;
-
- pthread_testcancel();
-
- if (s == NULL)
- {
- result = EINVAL;
- }
- else
- {
- if ((result = pthread_mutex_lock (&s->lock)) == 0)
- {
- int v;
-
- /* See sem_destroy.c
- */
- if (*sem == NULL)
- {
- (void) pthread_mutex_unlock (&s->lock);
- errno = EINVAL;
- return -1;
- }
-
- v = --s->value;
- (void) pthread_mutex_unlock (&s->lock);
-
- if (v < 0)
- {
-#if defined(_MSC_VER) && _MSC_VER < 1400
-#pragma inline_depth(0)
-#endif
- /* Must wait */
- pthread_cleanup_push(ptw32_sem_wait_cleanup, (void *) s);
- result = pthreadCancelableWait (s->sem);
- /* Cleanup if we're canceled or on any other error */
- pthread_cleanup_pop(result);
-#if defined(_MSC_VER) && _MSC_VER < 1400
-#pragma inline_depth()
-#endif
- }
-#if defined(NEED_SEM)
-
- if (!result && pthread_mutex_lock (&s->lock) == 0)
- {
- if (*sem == NULL)
- {
- (void) pthread_mutex_unlock (&s->lock);
- errno = EINVAL;
- return -1;
- }
-
- if (s->leftToUnblock > 0)
- {
- --s->leftToUnblock;
- SetEvent(s->sem);
- }
- (void) pthread_mutex_unlock (&s->lock);
- }
-
-#endif /* NEED_SEM */
-
- }
-
- }
-
- if (result != 0)
- {
- errno = result;
- return -1;
- }
-
- return 0;
-
-} /* sem_wait */