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/*
* POSIX RWLock Manager -- Destroy a RWLock Instance
*
* COPYRIGHT (c) 1989-2006.
* 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_init
*
* This directive creates a rwlock. A rwlock id is returned.
*
* Input parameters:
* rwlock - pointer to rwlock id
* attr - rwlock attributes
*
* Output parameters:
* rwlock - rwlock id
* 0 - if successful
* error code - if unsuccessful
*/
int pthread_rwlock_init(
pthread_rwlock_t *rwlock,
const pthread_rwlockattr_t *attr
)
{
POSIX_RWLock_Control *the_rwlock;
CORE_RWLock_Attributes the_attributes;
if ( !rwlock )
return EINVAL;
if ( !attr )
return EINVAL;
if ( !attr->is_initialized )
return EINVAL;
switch ( attr->process_shared ) {
case PTHREAD_PROCESS_PRIVATE: /* only supported values */
break;
case PTHREAD_PROCESS_SHARED:
default:
return EINVAL;
}
/*
the_attributes.discipline = CORE_RWLOCK_AUTOMATIC_RELEASE;
*/
_Thread_Disable_dispatch(); /* prevents deletion */
the_rwlock = _POSIX_RWLock_Allocate();
if ( !the_rwlock ) {
_Thread_Enable_dispatch();
return EAGAIN;
}
_CORE_RWLock_Initialize( &the_rwlock->RWLock, &the_attributes );
_Objects_Open(
&_POSIX_RWLock_Information,
&the_rwlock->Object,
0
);
*rwlock = the_rwlock->Object.id;
_Thread_Enable_dispatch();
return 0;
}
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