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/*
* POSIX RWLock Manager -- Destroy a RWLock
*
* COPYRIGHT (c) 1989-2007.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <pthread.h>
#include <errno.h>
#include <rtems/system.h>
#include <rtems/posix/rwlock.h>
/*
* pthread_rwlock_destroy
*
* This directive allows a thread to delete a rwlock specified by
* the rwlock id. The rwlock is freed back to the inactive
* rwlock chain.
*
* Input parameters:
* rwlock - rwlock id
*
* Output parameters:
* 0 - if successful
* error code - if unsuccessful
*/
int pthread_rwlock_destroy(
pthread_rwlock_t *rwlock
)
{
POSIX_RWLock_Control *the_rwlock = NULL;
Objects_Locations location;
if ( !rwlock )
return EINVAL;
the_rwlock = _POSIX_RWLock_Get( rwlock, &location );
switch ( location ) {
case OBJECTS_LOCAL:
/*
* If there is at least one thread waiting, then do not delete it.
*/
if ( _Thread_queue_First( &the_rwlock->RWLock.Wait_queue ) != NULL ) {
_Thread_Enable_dispatch();
return EBUSY;
}
/*
* POSIX doesn't require behavior when it is locked.
*/
_Objects_Close( &_POSIX_RWLock_Information, &the_rwlock->Object );
_POSIX_RWLock_Free( the_rwlock );
_Thread_Enable_dispatch();
return 0;
#if defined(RTEMS_MULTIPROCESSING)
case OBJECTS_REMOTE:
#endif
case OBJECTS_ERROR:
break;
}
return EINVAL;
}
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