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Viewing changes to win32/3rdparty/pthreads/pthread_rwlock_destroy.c

  • Committer: Package Import Robot
  • Author(s): Scott Kitterman
  • Date: 2011-08-25 09:02:32 UTC
  • mfrom: (105.2.2 natty-proposed) (105.1.5 oneiric)
  • Revision ID: package-import@ubuntu.com-20110825090232-84nkdn9ah8w9o83g
Tags: 0.97.2+dfsg-1ubuntu1.11.04
https://launchpad.net/bugs/826828
Microversion update from 0.97 to 0.97.2 (LP: #826828)

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win32/3rdparty/pthreads/pthread_rwlock_destroy.c
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/*
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 * pthread_rwlock_destroy.c
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 *
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 * Description:
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 * This translation unit implements read/write lock 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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 *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 */
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#include <limits.h>
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#include "pthread.h"
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#include "implement.h"
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int
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pthread_rwlock_destroy (pthread_rwlock_t * rwlock)
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{
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  pthread_rwlock_t rwl;
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  int result = 0, result1 = 0, result2 = 0;
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  if (rwlock == NULL || *rwlock == NULL)
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    {
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      return EINVAL;
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    }
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  if (*rwlock != PTHREAD_RWLOCK_INITIALIZER)
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    {
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      rwl = *rwlock;
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      if (rwl->nMagic != PTW32_RWLOCK_MAGIC)
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        {
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          return EINVAL;
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        }
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      if ((result = pthread_mutex_lock (&(rwl->mtxExclusiveAccess))) != 0)
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        {
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          return result;
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        }
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      if ((result =
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           pthread_mutex_lock (&(rwl->mtxSharedAccessCompleted))) != 0)
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        {
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          (void) pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));
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          return result;
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        }
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      /*
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       * Check whether any threads own/wait for the lock (wait for ex.access);
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       * report "BUSY" if so.
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       */
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      if (rwl->nExclusiveAccessCount > 0
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          || rwl->nSharedAccessCount > rwl->nCompletedSharedAccessCount)
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        {
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          result = pthread_mutex_unlock (&(rwl->mtxSharedAccessCompleted));
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          result1 = pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));
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          result2 = EBUSY;
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        }
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      else
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        {
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          rwl->nMagic = 0;
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          if ((result =
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               pthread_mutex_unlock (&(rwl->mtxSharedAccessCompleted))) != 0)
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            {
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              pthread_mutex_unlock (&rwl->mtxExclusiveAccess);
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              return result;
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            }
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          if ((result =
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               pthread_mutex_unlock (&(rwl->mtxExclusiveAccess))) != 0)
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            {
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              return result;
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            }
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          *rwlock = NULL;       /* Invalidate rwlock before anything else */
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          result = pthread_cond_destroy (&(rwl->cndSharedAccessCompleted));
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          result1 = pthread_mutex_destroy (&(rwl->mtxSharedAccessCompleted));
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          result2 = pthread_mutex_destroy (&(rwl->mtxExclusiveAccess));
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          (void) free (rwl);
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        }
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    }
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  else
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    {
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      /*
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       * See notes in ptw32_rwlock_check_need_init() above also.
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       */
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      EnterCriticalSection (&ptw32_rwlock_test_init_lock);
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      /*
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       * Check again.
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       */
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      if (*rwlock == PTHREAD_RWLOCK_INITIALIZER)
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        {
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          /*
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           * This is all we need to do to destroy a statically
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           * initialised rwlock that has not yet been used (initialised).
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           * If we get to here, another thread
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           * waiting to initialise this rwlock will get an EINVAL.
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           */
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          *rwlock = NULL;
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        }
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      else
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        {
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          /*
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           * The rwlock has been initialised while we were waiting
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           * so assume it's in use.
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           */
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          result = EBUSY;
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        }
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      LeaveCriticalSection (&ptw32_rwlock_test_init_lock);
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    }
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  return ((result != 0) ? result : ((result1 != 0) ? result1 : result2));
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}