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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup POSIXAPI
*
* @brief Allocate resources to use the read-write lock and Initialize it
*/
/*
* POSIX RWLock Manager -- Destroy a RWLock Instance
*
* COPYRIGHT (c) 1989-2006.
* On-Line Applications Research Corporation (OAR).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#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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