relibc_pthreads-emb/pthread_rwlockattr_destroy.c

/*
 * pthread_rwlockattr_destroy.c
 *
 * Description:
 * This translation unit implements read/write lock primitives.
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
 *      Copyright(C) 2008 Jason Schmidlapp
 *
 *      Contact Email: jschmidlapp@users.sourceforge.net
 *
 *
 *      Based upon 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 original list of contributors to the Pthreads-win32 project
 *      is contained in the file CONTRIBUTORS.ptw32 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 <stdlib.h>
#include <errno.h>
#include <limits.h>

#include "pthread.h"
#include "implement.h"

int
pthread_rwlockattr_destroy (pthread_rwlockattr_t * attr)
/*
 * ------------------------------------------------------
 * DOCPUBLIC
 *      Destroys a rwlock attributes object. The object can
 *      no longer be used.
 *
 * PARAMETERS
 *      attr
 *              pointer to an instance of pthread_rwlockattr_t
 *
 *
 * DESCRIPTION
 *      Destroys a rwlock attributes object. The object can
 *      no longer be used.
 *
 *      NOTES:
 *              1)      Does not affect rwlockss created using 'attr'
 *
 * RESULTS
 *              0               successfully released attr,
 *              EINVAL          'attr' is invalid.
 *
 * ------------------------------------------------------
 */
{
  int result = 0;

  if (attr == NULL || *attr == NULL)
    {
      result = EINVAL;
    }
  else
    {
      pthread_rwlockattr_t rwa = *attr;

      *attr = NULL;
      free (rwa);
    }

  return (result);
}				/* pthread_rwlockattr_destroy */