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/**
* @file
*
* @brief Changes the Priority of a Thread
*
* @ingroup ScoreThread
*/
/*
* COPYRIGHT (c) 1989-2011.
* 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/score/threadimpl.h>
#include <rtems/score/schedulerimpl.h>
#include <rtems/score/threadqimpl.h>
void _Thread_Change_priority(
Thread_Control *the_thread,
Priority_Control new_priority,
bool prepend_it
)
{
/*
* Do not bother recomputing all the priority related information if
* we are not REALLY changing priority.
*/
if ( the_thread->current_priority != new_priority ) {
ISR_Level level;
const Scheduler_Control *scheduler;
_ISR_Disable( level );
scheduler = _Scheduler_Get( the_thread );
the_thread->current_priority = new_priority;
if ( _States_Is_ready( the_thread->current_state ) ) {
_Scheduler_Change_priority(
scheduler,
the_thread,
new_priority,
prepend_it
);
_ISR_Flash( level );
/*
* We altered the set of thread priorities. So let's figure out
* who is the heir and if we need to switch to them.
*/
scheduler = _Scheduler_Get( the_thread );
_Scheduler_Schedule( scheduler, the_thread );
} else {
_Scheduler_Update( scheduler, the_thread );
}
_ISR_Enable( level );
_Thread_queue_Requeue( the_thread->Wait.queue, the_thread );
}
}
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