| /* |
| * pthread_barrier_destroy.c |
| * |
| * Description: |
| * This translation unit implements barrier primitives. |
| * |
| * -------------------------------------------------------------------------- |
| * |
| * 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 "implement.h" |
| |
| int |
| pthread_barrier_destroy (pthread_barrier_t * barrier) |
| { |
| int result = 0; |
| pthread_barrier_t b; |
| ptw32_mcs_local_node_t node; |
| |
| if (barrier == NULL || *barrier == (pthread_barrier_t) PTW32_OBJECT_INVALID) |
| { |
| return EINVAL; |
| } |
| |
| if (0 != ptw32_mcs_lock_try_acquire(&(*barrier)->lock, &node)) |
| { |
| return EBUSY; |
| } |
| |
| b = *barrier; |
| |
| if (b->nCurrentBarrierHeight < b->nInitialBarrierHeight) |
| { |
| result = EBUSY; |
| } |
| else |
| { |
| if (0 == (result = sem_destroy (&(b->semBarrierBreeched)))) |
| { |
| *barrier = (pthread_barrier_t) PTW32_OBJECT_INVALID; |
| /* |
| * Release the lock before freeing b. |
| * |
| * FIXME: There may be successors which, when we release the lock, |
| * will be linked into b->lock, which will be corrupted at some |
| * point with undefined results for the application. To fix this |
| * will require changing pthread_barrier_t from a pointer to |
| * pthread_barrier_t_ to an instance. This is a change to the ABI |
| * and will require a major version number increment. |
| */ |
| ptw32_mcs_lock_release(&node); |
| (void) free (b); |
| return 0; |
| } |
| else |
| { |
| /* |
| * This should not ever be reached. |
| * Restore the barrier to working condition before returning. |
| */ |
| (void) sem_init (&(b->semBarrierBreeched), b->pshared, 0); |
| } |
| |
| if (result != 0) |
| { |
| /* |
| * The barrier still exists and is valid |
| * in the event of any error above. |
| */ |
| result = EBUSY; |
| } |
| } |
| |
| ptw32_mcs_lock_release(&node); |
| return (result); |
| } |