diff options
Diffstat (limited to 'libs/pthreads/src/sem_destroy.c')
| -rw-r--r-- | libs/pthreads/src/sem_destroy.c | 139 |
1 files changed, 59 insertions, 80 deletions
diff --git a/libs/pthreads/src/sem_destroy.c b/libs/pthreads/src/sem_destroy.c index 6c98e80b93..d7b74e0c88 100644 --- a/libs/pthreads/src/sem_destroy.c +++ b/libs/pthreads/src/sem_destroy.c @@ -13,34 +13,38 @@ * * -------------------------------------------------------------------------- * - * Pthreads-win32 - POSIX Threads Library for Win32 + * Pthreads4w - 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 - * + * Copyright(C) 1999-2018, Pthreads4w contributors + * + * Homepage: https://sourceforge.net/projects/pthreads4w/ + * * 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 + * https://sourceforge.net/p/pthreads4w/wiki/Contributors/ + * + * This file is part of Pthreads4w. + * + * Pthreads4w is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * Pthreads4w 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with Pthreads4w. If not, see <http://www.gnu.org/licenses/>. * */ +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + #include "pthread.h" #include "semaphore.h" #include "implement.h" @@ -48,29 +52,29 @@ 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' - * - * ------------------------------------------------------ - */ +/* + * ------------------------------------------------------ + * 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; @@ -81,59 +85,34 @@ sem_destroy (sem_t * sem) } else { + ptw32_mcs_local_node_t node; s = *sem; - if ((result = pthread_mutex_lock (&s->lock)) == 0) + if ((result = ptw32_mcs_lock_try_acquire(&s->lock, &node)) == 0) { if (s->value < 0) { - (void) pthread_mutex_unlock (&s->lock); result = EBUSY; } else { - /* There are no threads currently blocked on this semaphore. */ - + /* + * There are no threads currently blocked on this semaphore + * however there could be threads about to wait behind us. + * It is up to the application to ensure this is not the case. + */ 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); + { + result = EINVAL; } } + ptw32_mcs_lock_release(&node); } } if (result != 0) { - errno = result; + PTW32_SET_ERRNO(result); return -1; } |