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/**
* @file
*
* @brief SMP Scheduler Implementation
*
* @ingroup ScoreSchedulerSMP
*/
/*
* Copyright (c) 2013 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* 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.
*/
#ifndef _RTEMS_SCORE_SCHEDULERSMPIMPL_H
#define _RTEMS_SCORE_SCHEDULERSMPIMPL_H
#include <rtems/score/schedulersmp.h>
#include <rtems/score/scheduler.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/**
* @addtogroup ScoreSchedulerSMP
*
* @{
*/
static inline Scheduler_SMP_Control *_Scheduler_SMP_Instance( void )
{
return _Scheduler.information;
}
static inline void _Scheduler_SMP_Allocate_processor(
Thread_Control *scheduled,
Thread_Control *victim
)
{
Per_CPU_Control *cpu_of_scheduled = scheduled->cpu;
Per_CPU_Control *cpu_of_victim = victim->cpu;
Thread_Control *heir;
scheduled->is_scheduled = true;
victim->is_scheduled = false;
_Per_CPU_Acquire( cpu_of_scheduled );
if ( scheduled->is_executing ) {
heir = cpu_of_scheduled->heir;
cpu_of_scheduled->heir = scheduled;
} else {
heir = scheduled;
}
_Per_CPU_Release( cpu_of_scheduled );
if ( heir != victim ) {
const Per_CPU_Control *cpu_of_executing = _Per_CPU_Get();
heir->cpu = cpu_of_victim;
/*
* FIXME: Here we need atomic store operations with a relaxed memory order.
* The _CPU_SMP_Send_interrupt() will ensure that the change can be
* observed consistently.
*/
cpu_of_victim->heir = heir;
cpu_of_victim->dispatch_necessary = true;
if ( cpu_of_victim != cpu_of_executing ) {
_Per_CPU_Send_interrupt( cpu_of_victim );
}
}
}
/** @} */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* _RTEMS_SCORE_SCHEDULERSMPIMPL_H */
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