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/**
* @file
*
* @brief RTEMS Semaphore Release
* @ingroup ClassicSem Semaphores
*
* This file contains the implementation of the Classic API directive
* rtems_semaphore_release().
*/
/*
* 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/system.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/support.h>
#include <rtems/rtems/attrimpl.h>
#include <rtems/score/isr.h>
#include <rtems/rtems/options.h>
#include <rtems/rtems/semimpl.h>
#include <rtems/score/coremuteximpl.h>
#include <rtems/score/coresemimpl.h>
#include <rtems/score/thread.h>
#include <rtems/score/interr.h>
/*
* rtems_semaphore_release
*
* This directive allows a thread to release a semaphore.
*
* Input parameters:
* id - semaphore id
*
* Output parameters:
* RTEMS_SUCCESSFUL - if successful
* error code - if unsuccessful
*/
#if defined(RTEMS_MULTIPROCESSING)
#define MUTEX_MP_SUPPORT _Semaphore_Core_mutex_mp_support
#else
#define MUTEX_MP_SUPPORT NULL
#endif
rtems_status_code rtems_semaphore_release(
rtems_id id
)
{
Semaphore_Control *the_semaphore;
Objects_Locations location;
CORE_mutex_Status mutex_status;
CORE_semaphore_Status semaphore_status;
rtems_attribute attribute_set;
ISR_lock_Context lock_context;
the_semaphore = _Semaphore_Get_interrupt_disable(
id,
&location,
&lock_context
);
switch ( location ) {
case OBJECTS_LOCAL:
attribute_set = the_semaphore->attribute_set;
#if defined(RTEMS_SMP)
if ( _Attributes_Is_multiprocessor_resource_sharing( attribute_set ) ) {
_Thread_Disable_dispatch();
_ISR_lock_ISR_enable( &lock_context );
MRSP_Status mrsp_status = _MRSP_Release(
&the_semaphore->Core_control.mrsp,
_Thread_Get_executing()
);
_Thread_Enable_dispatch();
return _Semaphore_Translate_MRSP_status_code( mrsp_status );
} else
#endif
if ( !_Attributes_Is_counting_semaphore( attribute_set ) ) {
mutex_status = _CORE_mutex_Surrender(
&the_semaphore->Core_control.mutex,
id,
MUTEX_MP_SUPPORT,
&lock_context
);
return _Semaphore_Translate_core_mutex_return_code( mutex_status );
} else {
semaphore_status = _CORE_semaphore_Surrender(
&the_semaphore->Core_control.semaphore,
id,
MUTEX_MP_SUPPORT,
&lock_context
);
return
_Semaphore_Translate_core_semaphore_return_code( semaphore_status );
}
#if defined(RTEMS_MULTIPROCESSING)
case OBJECTS_REMOTE:
return _Semaphore_MP_Send_request_packet(
SEMAPHORE_MP_RELEASE_REQUEST,
id,
0, /* Not used */
MPCI_DEFAULT_TIMEOUT
);
#endif
case OBJECTS_ERROR:
break;
}
return RTEMS_INVALID_ID;
}
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