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/**
* @file
*
* @ingroup RTEMSScoreSchedulerSMP
*
* @brief This header file provides interfaces of the
* @ref RTEMSScoreSchedulerSMP which are used by the implementation and the
* @ref RTEMSImplApplConfig.
*/
/*
* Copyright (c) 2013-2014 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.org/license/LICENSE.
*/
#ifndef _RTEMS_SCORE_SCHEDULERSMP_H
#define _RTEMS_SCORE_SCHEDULERSMP_H
#include <rtems/score/chain.h>
#include <rtems/score/scheduler.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/**
* @defgroup RTEMSScoreSchedulerSMP SMP Scheduler
*
* @ingroup RTEMSScoreScheduler
*
* @brief This group contains the SMP Scheduler implementation.
*
* @{
*/
/**
* @brief Scheduler context specialization for SMP schedulers.
*/
typedef struct {
/**
* @brief Basic scheduler context.
*/
Scheduler_Context Base;
/**
* @brief The chain of scheduled nodes.
*/
Chain_Control Scheduled;
/**
* @brief Chain of the available idle threads.
*
* Idle threads are used for the scheduler helping protocol. It is crucial
* that the idle threads preserve their relative order. This is the case for
* this priority based scheduler.
*/
Chain_Control Idle_threads;
} Scheduler_SMP_Context;
/**
* @brief SMP scheduler node states.
*/
typedef enum {
/**
* @brief This scheduler node is blocked.
*
* A scheduler node is blocked if the corresponding thread is not ready.
*/
SCHEDULER_SMP_NODE_BLOCKED,
/**
* @brief The scheduler node is scheduled.
*
* A scheduler node is scheduled if the corresponding thread is ready and the
* scheduler allocated a processor for it. A scheduled node is assigned to
* exactly one processor. The count of scheduled nodes in this scheduler
* instance equals the processor count owned by the scheduler instance.
*/
SCHEDULER_SMP_NODE_SCHEDULED,
/**
* @brief This scheduler node is ready.
*
* A scheduler node is ready if the corresponding thread is ready and the
* scheduler did not allocate a processor for it.
*/
SCHEDULER_SMP_NODE_READY
} Scheduler_SMP_Node_state;
/**
* @brief Scheduler node specialization for SMP schedulers.
*/
typedef struct {
/**
* @brief Basic scheduler node.
*/
Scheduler_Node Base;
/**
* @brief The state of this node.
*/
Scheduler_SMP_Node_state state;
/**
* @brief The current priority of thread owning this node.
*/
Priority_Control priority;
} Scheduler_SMP_Node;
/**
* @brief Starts an idle thread on the specified cpu.
*
* @param scheduler The scheduler instance.
* @param[in, out] idle The idle thread to schedule.
* @param[out] cpu The cpu to run the idle thread on.
*/
void _Scheduler_SMP_Start_idle(
const Scheduler_Control *scheduler,
Thread_Control *idle,
struct Per_CPU_Control *cpu
);
/** @} */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* _RTEMS_SCORE_SCHEDULERSMP_H */
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