mirror of
https://github.com/libretro/pcsx2.git
synced 2024-12-04 08:17:28 +00:00
144 lines
4.0 KiB
C
144 lines
4.0 KiB
C
/*
|
|
* pthread_rwlock_destroy.c
|
|
*
|
|
* Description:
|
|
* This translation unit implements read/write lock primitives.
|
|
*
|
|
* --------------------------------------------------------------------------
|
|
*
|
|
* 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 current list of contributors is contained
|
|
* in the file CONTRIBUTORS 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 <limits.h>
|
|
|
|
#include "pthread.h"
|
|
#include "implement.h"
|
|
|
|
int
|
|
pthread_rwlock_destroy (pthread_rwlock_t * rwlock)
|
|
{
|
|
pthread_rwlock_t rwl;
|
|
int result = 0, result1 = 0, result2 = 0;
|
|
|
|
if (rwlock == NULL || *rwlock == NULL)
|
|
{
|
|
return EINVAL;
|
|
}
|
|
|
|
if (*rwlock != PTHREAD_RWLOCK_INITIALIZER)
|
|
{
|
|
rwl = *rwlock;
|
|
|
|
if (rwl->nMagic != PTW32_RWLOCK_MAGIC)
|
|
{
|
|
return EINVAL;
|
|
}
|
|
|
|
if ((result = pthread_mutex_lock (&(rwl->mtxExclusiveAccess))) != 0)
|
|
{
|
|
return result;
|
|
}
|
|
|
|
if ((result =
|
|
pthread_mutex_lock (&(rwl->mtxSharedAccessCompleted))) != 0)
|
|
{
|
|
(void) pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Check whether any threads own/wait for the lock (wait for ex.access);
|
|
* report "BUSY" if so.
|
|
*/
|
|
if (rwl->nExclusiveAccessCount > 0
|
|
|| rwl->nSharedAccessCount > rwl->nCompletedSharedAccessCount)
|
|
{
|
|
result = pthread_mutex_unlock (&(rwl->mtxSharedAccessCompleted));
|
|
result1 = pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));
|
|
result2 = EBUSY;
|
|
}
|
|
else
|
|
{
|
|
rwl->nMagic = 0;
|
|
|
|
if ((result =
|
|
pthread_mutex_unlock (&(rwl->mtxSharedAccessCompleted))) != 0)
|
|
{
|
|
pthread_mutex_unlock (&rwl->mtxExclusiveAccess);
|
|
return result;
|
|
}
|
|
|
|
if ((result =
|
|
pthread_mutex_unlock (&(rwl->mtxExclusiveAccess))) != 0)
|
|
{
|
|
return result;
|
|
}
|
|
|
|
*rwlock = NULL; /* Invalidate rwlock before anything else */
|
|
result = pthread_cond_destroy (&(rwl->cndSharedAccessCompleted));
|
|
result1 = pthread_mutex_destroy (&(rwl->mtxSharedAccessCompleted));
|
|
result2 = pthread_mutex_destroy (&(rwl->mtxExclusiveAccess));
|
|
(void) free (rwl);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
ptw32_mcs_local_node_t node;
|
|
/*
|
|
* See notes in ptw32_rwlock_check_need_init() above also.
|
|
*/
|
|
ptw32_mcs_lock_acquire(&ptw32_rwlock_test_init_lock, &node);
|
|
|
|
/*
|
|
* Check again.
|
|
*/
|
|
if (*rwlock == PTHREAD_RWLOCK_INITIALIZER)
|
|
{
|
|
/*
|
|
* This is all we need to do to destroy a statically
|
|
* initialised rwlock that has not yet been used (initialised).
|
|
* If we get to here, another thread
|
|
* waiting to initialise this rwlock will get an EINVAL.
|
|
*/
|
|
*rwlock = NULL;
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* The rwlock has been initialised while we were waiting
|
|
* so assume it's in use.
|
|
*/
|
|
result = EBUSY;
|
|
}
|
|
|
|
ptw32_mcs_lock_release(&node);
|
|
}
|
|
|
|
return ((result != 0) ? result : ((result1 != 0) ? result1 : result2));
|
|
}
|