/**
* @file
*
* @brief Simple SMP Scheduler Implementation
*
* @ingroup ScoreSchedulerSMP
*/
/*
* Copyright (c) 2013 embedded brains GmbH.
*
* 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/schedulersimplesmp.h>
#include <rtems/score/schedulersmpimpl.h>
#include <rtems/score/wkspace.h>
void _Scheduler_simple_smp_Initialize( void )
{
Scheduler_SMP_Control *self =
_Workspace_Allocate_or_fatal_error( sizeof( *self ) );
_Chain_Initialize_empty( &self->ready[ 0 ] );
_Chain_Initialize_empty( &self->scheduled );
_Scheduler.information = self;
}
static Thread_Control *_Scheduler_simple_smp_Get_highest_ready(
Scheduler_SMP_Control *self
)
{
Thread_Control *highest_ready = NULL;
Chain_Control *ready = &self->ready[ 0 ];
if ( !_Chain_Is_empty( ready ) ) {
highest_ready = (Thread_Control *) _Chain_First( ready );
}
return highest_ready;
}
static void _Scheduler_simple_smp_Move_from_scheduled_to_ready(
Scheduler_SMP_Control *self,
Thread_Control *scheduled_to_ready
)
{
_Chain_Extract_unprotected( &scheduled_to_ready->Object.Node );
_Scheduler_simple_Insert_priority_lifo(
&self->ready[ 0 ],
scheduled_to_ready
);
}
static void _Scheduler_simple_smp_Move_from_ready_to_scheduled(
Scheduler_SMP_Control *self,
Thread_Control *ready_to_scheduled
)
{
_Chain_Extract_unprotected( &ready_to_scheduled->Object.Node );
_Scheduler_simple_Insert_priority_fifo(
&self->scheduled,
ready_to_scheduled
);
}
static void _Scheduler_simple_smp_Insert_ready_lifo(
Scheduler_SMP_Control *self,
Thread_Control *thread
)
{
_Chain_Insert_ordered_unprotected(
&self->ready[ 0 ],
&thread->Object.Node,
_Scheduler_simple_Insert_priority_lifo_order
);
}
static void _Scheduler_simple_smp_Insert_ready_fifo(
Scheduler_SMP_Control *self,
Thread_Control *thread
)
{
_Chain_Insert_ordered_unprotected(
&self->ready[ 0 ],
&thread->Object.Node,
_Scheduler_simple_Insert_priority_fifo_order
);
}
static void _Scheduler_simple_smp_Do_extract(
Scheduler_SMP_Control *self,
Thread_Control *thread
)
{
( void ) self;
thread->is_in_the_air = thread->is_scheduled;
thread->is_scheduled = false;
_Chain_Extract_unprotected( &thread->Object.Node );
}
void _Scheduler_simple_smp_Block( Thread_Control *thread )
{
Scheduler_SMP_Control *self = _Scheduler_SMP_Instance();
_Scheduler_SMP_Block(
self,
thread,
_Scheduler_simple_smp_Do_extract,
_Scheduler_simple_smp_Get_highest_ready,
_Scheduler_simple_smp_Move_from_ready_to_scheduled
);
}
static void _Scheduler_simple_smp_Enqueue_ordered(
Scheduler_SMP_Control *self,
Thread_Control *thread,
Chain_Node_order order,
Scheduler_SMP_Insert insert_ready,
Scheduler_SMP_Insert insert_scheduled
)
{
_Scheduler_SMP_Enqueue_ordered(
self,
thread,
order,
_Scheduler_simple_smp_Get_highest_ready,
insert_ready,
insert_scheduled,
_Scheduler_simple_smp_Move_from_ready_to_scheduled,
_Scheduler_simple_smp_Move_from_scheduled_to_ready
);
}
void _Scheduler_simple_smp_Enqueue_priority_lifo( Thread_Control *thread )
{
Scheduler_SMP_Control *self = _Scheduler_SMP_Instance();
_Scheduler_simple_smp_Enqueue_ordered(
self,
thread,
_Scheduler_simple_Insert_priority_lifo_order,
_Scheduler_simple_smp_Insert_ready_lifo,
_Scheduler_SMP_Insert_scheduled_lifo
);
}
void _Scheduler_simple_smp_Enqueue_priority_fifo( Thread_Control *thread )
{
Scheduler_SMP_Control *self = _Scheduler_SMP_Instance();
_Scheduler_simple_smp_Enqueue_ordered(
self,
thread,
_Scheduler_simple_Insert_priority_fifo_order,
_Scheduler_simple_smp_Insert_ready_fifo,
_Scheduler_SMP_Insert_scheduled_fifo
);
}
void _Scheduler_simple_smp_Extract( Thread_Control *thread )
{
Scheduler_SMP_Control *self = _Scheduler_SMP_Instance();
_Scheduler_SMP_Extract(
self,
thread,
_Scheduler_simple_smp_Do_extract
);
}
void _Scheduler_simple_smp_Yield( Thread_Control *thread )
{
ISR_Level level;
_ISR_Disable( level );
_Scheduler_simple_smp_Extract( thread );
_Scheduler_simple_smp_Enqueue_priority_fifo( thread );
_ISR_Enable( level );
}
void _Scheduler_simple_smp_Schedule( Thread_Control *thread )
{
Scheduler_SMP_Control *self = _Scheduler_SMP_Instance();
_Scheduler_SMP_Schedule(
self,
thread,
_Scheduler_simple_smp_Get_highest_ready,
_Scheduler_simple_smp_Move_from_ready_to_scheduled
);
}