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Diffstat (limited to 'pthreads/src/pthread_barrier_destroy.c')
-rw-r--r-- | pthreads/src/pthread_barrier_destroy.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/pthreads/src/pthread_barrier_destroy.c b/pthreads/src/pthread_barrier_destroy.c new file mode 100644 index 0000000..55163cc --- /dev/null +++ b/pthreads/src/pthread_barrier_destroy.c @@ -0,0 +1,103 @@ +/* + * 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); +} |