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/**
* @file
*
* @brief RTEMS Obtain Semaphore
* @ingroup ClassicSem
*/
/*
* COPYRIGHT (c) 1989-2014.
* 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.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/semimpl.h>
#include <rtems/rtems/attrimpl.h>
#include <rtems/rtems/optionsimpl.h>
THREAD_QUEUE_OBJECT_ASSERT(
Semaphore_Control,
Core_control.mutex.Wait_queue
);
THREAD_QUEUE_OBJECT_ASSERT(
Semaphore_Control,
Core_control.semaphore.Wait_queue
);
rtems_status_code rtems_semaphore_obtain(
rtems_id id,
rtems_option option_set,
rtems_interval timeout
)
{
Semaphore_Control *the_semaphore;
Thread_queue_Context queue_context;
Thread_Control *executing;
rtems_attribute attribute_set;
bool wait;
the_semaphore = _Semaphore_Get( id, &queue_context, NULL );
if ( the_semaphore == NULL ) {
#if defined(RTEMS_MULTIPROCESSING)
return _Semaphore_MP_Obtain( id, option_set, timeout );
#else
return RTEMS_INVALID_ID;
#endif
}
executing = _Thread_Executing;
attribute_set = the_semaphore->attribute_set;
wait = !_Options_Is_no_wait( option_set );
#if defined(RTEMS_SMP)
if ( _Attributes_Is_multiprocessor_resource_sharing( attribute_set ) ) {
MRSP_Status mrsp_status;
mrsp_status = _MRSP_Seize(
&the_semaphore->Core_control.mrsp,
executing,
wait,
timeout,
&queue_context
);
return _Semaphore_Translate_MRSP_status_code( mrsp_status );
} else
#endif
if ( !_Attributes_Is_counting_semaphore( attribute_set ) ) {
_CORE_mutex_Seize(
&the_semaphore->Core_control.mutex,
executing,
wait,
timeout,
&queue_context
);
return _Semaphore_Translate_core_mutex_return_code(
executing->Wait.return_code
);
}
/* must be a counting semaphore */
_CORE_semaphore_Seize(
&the_semaphore->Core_control.semaphore,
executing,
wait,
timeout,
&queue_context
);
return _Semaphore_Translate_core_semaphore_return_code(
executing->Wait.return_code
);
}
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