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/*
* 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);
}
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