104 lines
3.2 KiB
C
104 lines
3.2 KiB
C
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/*
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* pthread_barrier_destroy.c
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*
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* Description:
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* This translation unit implements barrier primitives.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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int
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pthread_barrier_destroy (pthread_barrier_t * barrier)
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{
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int result = 0;
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pthread_barrier_t b;
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ptw32_mcs_local_node_t node;
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if (barrier == NULL || *barrier == (pthread_barrier_t) PTW32_OBJECT_INVALID)
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{
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return EINVAL;
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}
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if (0 != ptw32_mcs_lock_try_acquire(&(*barrier)->lock, &node))
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{
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return EBUSY;
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}
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b = *barrier;
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if (b->nCurrentBarrierHeight < b->nInitialBarrierHeight)
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{
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result = EBUSY;
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}
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else
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{
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if (0 == (result = sem_destroy (&(b->semBarrierBreeched))))
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{
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*barrier = (pthread_barrier_t) PTW32_OBJECT_INVALID;
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/*
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* Release the lock before freeing b.
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*
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* FIXME: There may be successors which, when we release the lock,
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* will be linked into b->lock, which will be corrupted at some
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* point with undefined results for the application. To fix this
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* will require changing pthread_barrier_t from a pointer to
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* pthread_barrier_t_ to an instance. This is a change to the ABI
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* and will require a major version number increment.
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*/
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ptw32_mcs_lock_release(&node);
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(void) free (b);
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return 0;
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}
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else
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{
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/*
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* This should not ever be reached.
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* Restore the barrier to working condition before returning.
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*/
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(void) sem_init (&(b->semBarrierBreeched), b->pshared, 0);
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}
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if (result != 0)
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{
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/*
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* The barrier still exists and is valid
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* in the event of any error above.
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*/
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result = EBUSY;
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}
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}
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ptw32_mcs_lock_release(&node);
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return (result);
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}
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