native_client_sdk/src/libraries/third_party/pthreads-win32/pthread_rwlockattr_destroy.c

   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@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 */