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/**
* @file
*
* @ingroup ClassicSem Semaphores
*
* @brief RTEMS Semaphore Release
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/semimpl.h>
#include <rtems/rtems/statusimpl.h>
rtems_status_code rtems_semaphore_release( rtems_id id )
{
Semaphore_Control *the_semaphore;
Thread_queue_Context queue_context;
Thread_Control *executing;
uintptr_t flags;
Semaphore_Variant variant;
Status_Control status;
the_semaphore = _Semaphore_Get( id, &queue_context );
if ( the_semaphore == NULL ) {
#if defined(RTEMS_MULTIPROCESSING)
return _Semaphore_MP_Release( id );
#else
return RTEMS_INVALID_ID;
#endif
}
executing = _Thread_Executing;
_Thread_queue_Context_set_MP_callout(
&queue_context,
_Semaphore_Core_mutex_mp_support
);
flags = _Semaphore_Get_flags( the_semaphore );
variant = _Semaphore_Get_variant( flags );
switch ( variant ) {
case SEMAPHORE_VARIANT_MUTEX_INHERIT_PRIORITY:
status = _CORE_recursive_mutex_Surrender(
&the_semaphore->Core_control.Mutex.Recursive,
CORE_MUTEX_TQ_PRIORITY_INHERIT_OPERATIONS,
executing,
&queue_context
);
break;
case SEMAPHORE_VARIANT_MUTEX_PRIORITY_CEILING:
status = _CORE_ceiling_mutex_Surrender(
&the_semaphore->Core_control.Mutex,
executing,
&queue_context
);
break;
case SEMAPHORE_VARIANT_MUTEX_NO_PROTOCOL:
status = _CORE_recursive_mutex_Surrender(
&the_semaphore->Core_control.Mutex.Recursive,
_Semaphore_Get_operations( flags ),
executing,
&queue_context
);
break;
case SEMAPHORE_VARIANT_SIMPLE_BINARY:
status = _CORE_semaphore_Surrender(
&the_semaphore->Core_control.Semaphore,
_Semaphore_Get_operations( flags ),
1,
&queue_context
);
_Assert(
status == STATUS_SUCCESSFUL
|| status == STATUS_MAXIMUM_COUNT_EXCEEDED
);
status = STATUS_SUCCESSFUL;
break;
#if defined(RTEMS_SMP)
case SEMAPHORE_VARIANT_MRSP:
status = _MRSP_Surrender(
&the_semaphore->Core_control.MRSP,
executing,
&queue_context
);
break;
#endif
default:
_Assert( variant == SEMAPHORE_VARIANT_COUNTING );
status = _CORE_semaphore_Surrender(
&the_semaphore->Core_control.Semaphore,
_Semaphore_Get_operations( flags ),
UINT32_MAX,
&queue_context
);
break;
}
return _Status_Get( status );
}
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