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/*
* Scheduler Priority Handler / Yield
*
* Copyright (C) 2010 Gedare Bloom.
* Copyright (C) 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.com/license/LICENSE.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/score/isr.h>
#include <rtems/score/scheduler.h>
#include <rtems/score/schedulerpriority.h>
#include <rtems/score/thread.h>
/*
* INTERRUPT LATENCY:
* ready chain
* select heir
*/
void _Scheduler_priority_Yield(void)
{
Scheduler_priority_Per_thread *sched_info;
ISR_Level level;
Thread_Control *executing;
Chain_Control *ready;
executing = _Thread_Executing;
sched_info = (Scheduler_priority_Per_thread *) executing->scheduler_info;
ready = sched_info->ready_chain;
_ISR_Disable( level );
if ( !_Chain_Has_only_one_node( ready ) ) {
_Chain_Extract_unprotected( &executing->Object.Node );
_Chain_Append_unprotected( ready, &executing->Object.Node );
_ISR_Flash( level );
if ( _Thread_Is_heir( executing ) )
_Thread_Heir = (Thread_Control *) _Chain_First( ready );
_Thread_Dispatch_necessary = true;
}
else if ( !_Thread_Is_heir( executing ) )
_Thread_Dispatch_necessary = true;
_ISR_Enable( level );
}
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