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      1 /*
      2  * pthread_rwlockattr_destroy.c
      3  *
      4  * Description:
      5  * This translation unit implements read/write lock primitives.
      6  *
      7  * --------------------------------------------------------------------------
      8  *
      9  *      Pthreads-win32 - POSIX Threads Library for Win32
     10  *      Copyright(C) 1998 John E. Bossom
     11  *      Copyright(C) 1999,2005 Pthreads-win32 contributors
     12  *
     13  *      Contact Email: rpj (at) callisto.canberra.edu.au
     14  *
     15  *      The current list of contributors is contained
     16  *      in the file CONTRIBUTORS included with the source
     17  *      code distribution. The list can also be seen at the
     18  *      following World Wide Web location:
     19  *      http://sources.redhat.com/pthreads-win32/contributors.html
     20  *
     21  *      This library is free software; you can redistribute it and/or
     22  *      modify it under the terms of the GNU Lesser General Public
     23  *      License as published by the Free Software Foundation; either
     24  *      version 2 of the License, or (at your option) any later version.
     25  *
     26  *      This library is distributed in the hope that it will be useful,
     27  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
     28  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     29  *      Lesser General Public License for more details.
     30  *
     31  *      You should have received a copy of the GNU Lesser General Public
     32  *      License along with this library in the file COPYING.LIB;
     33  *      if not, write to the Free Software Foundation, Inc.,
     34  *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
     35  */
     36 
     37 #include <limits.h>
     38 
     39 #include "pthread.h"
     40 #include "implement.h"
     41 
     42 int
     43 pthread_rwlockattr_destroy (pthread_rwlockattr_t * attr)
     44      /*
     45       * ------------------------------------------------------
     46       * DOCPUBLIC
     47       *      Destroys a rwlock attributes object. The object can
     48       *      no longer be used.
     49       *
     50       * PARAMETERS
     51       *      attr
     52       *              pointer to an instance of pthread_rwlockattr_t
     53       *
     54       *
     55       * DESCRIPTION
     56       *      Destroys a rwlock attributes object. The object can
     57       *      no longer be used.
     58       *
     59       *      NOTES:
     60       *              1)      Does not affect rwlockss created using 'attr'
     61       *
     62       * RESULTS
     63       *              0               successfully released attr,
     64       *              EINVAL          'attr' is invalid.
     65       *
     66       * ------------------------------------------------------
     67       */
     68 {
     69   int result = 0;
     70 
     71   if (attr == NULL || *attr == NULL)
     72     {
     73       result = EINVAL;
     74     }
     75   else
     76     {
     77       pthread_rwlockattr_t rwa = *attr;
     78 
     79       *attr = NULL;
     80       free (rwa);
     81     }
     82 
     83   return (result);
     84 }				/* pthread_rwlockattr_destroy */
     85