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Diffstat (limited to 'pthreads/src/sem_destroy.c')
| -rw-r--r-- | pthreads/src/sem_destroy.c | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/pthreads/src/sem_destroy.c b/pthreads/src/sem_destroy.c deleted file mode 100644 index 6c98e80..0000000 --- a/pthreads/src/sem_destroy.c +++ /dev/null @@ -1,144 +0,0 @@ -/* - * ------------------------------------------------------------- - * - * Module: sem_destroy.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" - - -int -sem_destroy (sem_t * sem) - /* - * ------------------------------------------------------ - * DOCPUBLIC - * This function destroys an unnamed semaphore. - * - * PARAMETERS - * sem - * pointer to an instance of sem_t - * - * DESCRIPTION - * This function destroys an unnamed semaphore. - * - * RESULTS - * 0 successfully destroyed semaphore, - * -1 failed, error in errno - * ERRNO - * EINVAL 'sem' is not a valid semaphore, - * ENOSYS semaphores are not supported, - * EBUSY threads (or processes) are currently - * blocked on 'sem' - * - * ------------------------------------------------------ - */ -{ - int result = 0; - sem_t s = NULL; - - if (sem == NULL || *sem == NULL) - { - result = EINVAL; - } - else - { - s = *sem; - - if ((result = pthread_mutex_lock (&s->lock)) == 0) - { - if (s->value < 0) - { - (void) pthread_mutex_unlock (&s->lock); - result = EBUSY; - } - else - { - /* There are no threads currently blocked on this semaphore. */ - - if (!CloseHandle (s->sem)) - { - (void) pthread_mutex_unlock (&s->lock); - result = EINVAL; - } - else - { - /* - * Invalidate the semaphore handle when we have the lock. - * Other sema operations should test this after acquiring the lock - * to check that the sema is still valid, i.e. before performing any - * operations. This may only be necessary before the sema op routine - * returns so that the routine can return EINVAL - e.g. if setting - * s->value to SEM_VALUE_MAX below does force a fall-through. - */ - *sem = NULL; - - /* Prevent anyone else actually waiting on or posting this sema. - */ - s->value = SEM_VALUE_MAX; - - (void) pthread_mutex_unlock (&s->lock); - - do - { - /* Give other threads a chance to run and exit any sema op - * routines. Due to the SEM_VALUE_MAX value, if sem_post or - * sem_wait were blocked by us they should fall through. - */ - Sleep(0); - } - while (pthread_mutex_destroy (&s->lock) == EBUSY); - } - } - } - } - - if (result != 0) - { - errno = result; - return -1; - } - - free (s); - - return 0; - -} /* sem_destroy */ |