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/**
* @file
*
* @brief RTEMS Set Task Priority
* @ingroup ClassicTasks
*/
/*
* 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/tasksimpl.h>
#include <rtems/score/threadimpl.h>
rtems_status_code rtems_task_set_priority(
rtems_id id,
rtems_task_priority new_priority,
rtems_task_priority *old_priority
)
{
Thread_Control *the_thread;
ISR_lock_Context lock_context;
Per_CPU_Control *cpu_self;
if ( new_priority != RTEMS_CURRENT_PRIORITY &&
!_RTEMS_tasks_Priority_is_valid( new_priority ) )
return RTEMS_INVALID_PRIORITY;
if ( !old_priority )
return RTEMS_INVALID_ADDRESS;
the_thread = _Thread_Get( id, &lock_context );
if ( the_thread == NULL ) {
#if defined(RTEMS_MULTIPROCESSING)
return _RTEMS_tasks_MP_Set_priority( id, new_priority, old_priority );
#else
return RTEMS_INVALID_ID;
#endif
}
cpu_self = _Thread_Dispatch_disable_critical( &lock_context );
_ISR_lock_ISR_enable( &lock_context );
if ( new_priority != RTEMS_CURRENT_PRIORITY ) {
_Thread_Set_priority(
the_thread,
_RTEMS_tasks_Priority_to_Core( new_priority ),
old_priority,
false
);
*old_priority = _RTEMS_tasks_Priority_from_Core( *old_priority );
} else {
*old_priority = _RTEMS_tasks_Priority_from_Core(
the_thread->current_priority
);
}
_Thread_Dispatch_enable( cpu_self );
return RTEMS_SUCCESSFUL;
}
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