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/**
* @file
*
* @brief Allocate resources to use the read-write lock and Initialize it
* @ingroup POSIXAPI
*/
/*
* 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.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/posix/rwlockimpl.h>
#include <rtems/posix/posixapi.h>
RTEMS_STATIC_ASSERT(
offsetof( POSIX_RWLock_Control, flags )
== offsetof( pthread_rwlock_t, _flags ),
POSIX_RWLOCK_CONTROL_FLAGS
);
RTEMS_STATIC_ASSERT(
offsetof( POSIX_RWLock_Control, RWLock.current_state )
== offsetof( pthread_rwlock_t, _current_state ),
POSIX_RWLOCK_CONTROL_CURRENT_STATE
);
RTEMS_STATIC_ASSERT(
offsetof( POSIX_RWLock_Control, RWLock.number_of_readers )
== offsetof( pthread_rwlock_t, _number_of_readers ),
POSIX_RWLOCK_CONTROL_NUMBER_OF_READERS
);
RTEMS_STATIC_ASSERT(
offsetof( POSIX_RWLock_Control, RWLock.Queue )
== offsetof( pthread_rwlock_t, _Queue ),
POSIX_RWLOCK_CONTROL_QUEUE
);
RTEMS_STATIC_ASSERT(
sizeof( POSIX_RWLock_Control ) == sizeof( pthread_rwlock_t ),
POSIX_RWLOCK_CONTROL_SIZE
);
int pthread_rwlock_init(
pthread_rwlock_t *rwlock,
const pthread_rwlockattr_t *attr
)
{
POSIX_RWLock_Control *the_rwlock;
the_rwlock = _POSIX_RWLock_Get( rwlock );
if ( the_rwlock == NULL ) {
return EINVAL;
}
if ( attr != NULL ) {
if ( !attr->is_initialized ) {
return EINVAL;
}
if ( !_POSIX_Is_valid_pshared( attr->process_shared ) ) {
return EINVAL;
}
}
the_rwlock->flags = (uintptr_t) the_rwlock ^ POSIX_RWLOCK_MAGIC;
_CORE_RWLock_Initialize( &the_rwlock->RWLock );
return 0;
}
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