/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSScoreSchedulerSimple
*
* @brief This header file provides interfaces of the
* @ref RTEMSScoreSchedulerSimple which are only used by the implementation.
*/
/*
* Copyright (C) 2011 On-Line Applications Research Corporation (OAR).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _RTEMS_SCORE_SCHEDULERSIMPLEIMPL_H
#define _RTEMS_SCORE_SCHEDULERSIMPLEIMPL_H
#include <rtems/score/schedulersimple.h>
#include <rtems/score/chainimpl.h>
#include <rtems/score/schedulerimpl.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @addtogroup RTEMSScoreSchedulerSimple
*
* @{
*/
/**
* @brief Gets context of the scheduler.
*
* @param scheduler The scheduler instance to get the context of.
*
* @return The context of @a scheduler.
*/
RTEMS_INLINE_ROUTINE Scheduler_simple_Context *
_Scheduler_simple_Get_context( const Scheduler_Control *scheduler )
{
return (Scheduler_simple_Context *) _Scheduler_Get_context( scheduler );
}
/**
* @brief Checks if the priority is less or equal than the priority of the node.
*
* @param key is the priority to compare.
*
* @param to_insert is the chain node to insert.
*
* @param next is the chain node to compare the priority of.
*
* @retval true @a to_insert is smaller or equal than the priority of @a next.
* @retval false @a to_insert is greater than the priority of @a next.
*/
RTEMS_INLINE_ROUTINE bool _Scheduler_simple_Priority_less_equal(
const void *key,
const Chain_Node *to_insert,
const Chain_Node *next
)
{
const unsigned int *priority_to_insert;
const Thread_Control *thread_next;
(void) to_insert;
priority_to_insert = (const unsigned int *) key;
thread_next = (const Thread_Control *) next;
return *priority_to_insert <= _Thread_Get_priority( thread_next );
}
/**
* @brief Inserts the thread control with the given priority into the chain.
*
* @param[in, out] chain The chain to insert @a to_insert in.
* @param[in, out] to_insert The node to insert into @a chain.
* @param insert_priority The priority to insert @a to_insert with.
*/
RTEMS_INLINE_ROUTINE void _Scheduler_simple_Insert(
Chain_Control *chain,
Thread_Control *to_insert,
unsigned int insert_priority
)
{
_Chain_Insert_ordered_unprotected(
chain,
&to_insert->Object.Node,
&insert_priority,
_Scheduler_simple_Priority_less_equal
);
}
/**
* @brief Extracts the threads node.
*
* @param scheduler This parameter is unused.
* @param[in, out] the_thread The thread of which to extract the node out of its chain.
* @param node This parameter is unused.
*/
RTEMS_INLINE_ROUTINE void _Scheduler_simple_Extract(
const Scheduler_Control *scheduler,
Thread_Control *the_thread,
Scheduler_Node *node
)
{
(void) scheduler;
(void) node;
_Chain_Extract_unprotected( &the_thread->Object.Node );
}
/**
* @brief Scheduling decision logic.
*
* This kernel routine implements scheduling decision logic for the simple scheduler.
*
* @param[in, out] scheduler The scheduler instance.
* @param the_thread This parameter is unused.
* @param force_dispatch Indicates whether the dispatch happens also if
* the currently executing thread is set as not preemptible.
*/
RTEMS_INLINE_ROUTINE void _Scheduler_simple_Schedule_body(
const Scheduler_Control *scheduler,
Thread_Control *the_thread,
bool force_dispatch
)
{
Scheduler_simple_Context *context =
_Scheduler_simple_Get_context( scheduler );
Thread_Control *heir = (Thread_Control *) _Chain_First( &context->Ready );
( void ) the_thread;
_Scheduler_Update_heir( heir, force_dispatch );
}
/** @} */
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
