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/**
* @file
*
* @brief Changes the Priority of a Thread
*
* @ingroup ScoreThread
*/
/*
* 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/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
)
{
ISR_lock_Context lock_context;
ISR_lock_Control *lock;
lock = _Thread_Lock_acquire( the_thread, &lock_context );
/*
* Do not bother recomputing all the priority related information if
* we are not REALLY changing priority.
*/
if ( the_thread->current_priority != new_priority ) {
uint32_t my_generation;
my_generation = the_thread->priority_generation + 1;
the_thread->current_priority = new_priority;
the_thread->priority_generation = my_generation;
( *the_thread->Wait.operations->priority_change )(
the_thread,
new_priority,
the_thread->Wait.queue
);
_Thread_Lock_release( lock, &lock_context );
_Scheduler_Acquire( the_thread, &lock_context );
if ( the_thread->priority_generation == my_generation ) {
if ( _States_Is_ready( the_thread->current_state ) ) {
_Scheduler_Change_priority(
the_thread,
new_priority,
prepend_it
);
} else {
_Scheduler_Update_priority( the_thread, new_priority );
}
}
_Scheduler_Release( the_thread, &lock_context );
} else {
_Thread_Lock_release( lock, &lock_context );
}
}
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