/**
* @file
*
* @brief Inlined Routines Associated with the Manipulation of the Scheduler
*
* This inline file contains all of the inlined routines associated with
* the manipulation of the scheduler.
*/
/*
* 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.org/license/LICENSE.
*/
#ifndef _RTEMS_SCORE_SCHEDULERIMPL_H
#define _RTEMS_SCORE_SCHEDULERIMPL_H
#include <rtems/score/scheduler.h>
#include <rtems/score/threadimpl.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @addtogroup ScoreScheduler
*/
/**@{**/
/**
* @brief Initializes the scheduler to the policy chosen by the user.
*
* This routine initializes the scheduler to the policy chosen by the user
* through confdefs, or to the priority scheduler with ready chains by
* default.
*/
void _Scheduler_Handler_initialization( void );
/**
* The preferred method to add a new scheduler is to define the jump table
* entries and add a case to the _Scheduler_Initialize routine.
*
* Generic scheduling implementations that rely on the ready queue only can
* be found in the _Scheduler_queue_XXX functions.
*/
/*
* Passing the Scheduler_Control* to these functions allows for multiple
* scheduler's to exist simultaneously, which could be useful on an SMP
* system. Then remote Schedulers may be accessible. How to protect such
* accesses remains an open problem.
*/
/**
* @brief Scheduler schedule.
*
* This kernel routine implements the scheduling decision logic for
* the scheduler. It does NOT dispatch.
*
* @param[in] the_thread The thread which state changed previously.
*/
RTEMS_INLINE_ROUTINE void _Scheduler_Schedule(
const Scheduler_Control *scheduler,
Thread_Control *the_thread
)
{
( *scheduler->Operations.schedule )( scheduler, the_thread );
}
/**
* @brief Scheduler yield with a particular thread.
*
* This routine is invoked when a thread wishes to voluntarily transfer control
* of the processor to another thread.
*
* @param[in] the_thread The yielding thread.
*/
RTEMS_INLINE_ROUTINE void _Scheduler_Yield(
const Scheduler_Control *scheduler,
Thread_Control *the_thread
)
{
( *scheduler->Operations.yield )( scheduler, the_thread );
}
/**
* @brief Scheduler block.
*
* This routine removes @a the_thread from the scheduling decision for
* the scheduler. The primary task is to remove the thread from the
* ready queue. It performs any necessary schedulering operations
* including the selection of a new heir thread.
*/
RTEMS_INLINE_ROUTINE void _Scheduler_Block(
const Scheduler_Control *scheduler,
Thread_Control *the_thread
)
{
( *scheduler->Operations.block )( scheduler, the_thread );
}
/**
* @brief Scheduler unblock.
*
* This routine adds @a the_thread to the scheduling decision for
* the scheduler. The primary task is to add the thread to the
* ready queue per the schedulering policy and update any appropriate
* scheduling variables, for example the heir thread.
*/
RTEMS_INLINE_ROUTINE void _Scheduler_Unblock(
const Scheduler_Control *scheduler,
Thread_Control *the_thread
)
{
( *scheduler->Operations.unblock )( scheduler, the_thread );
}
/**
* @brief Scheduler allocate.
*
* This routine allocates @a the_thread->scheduler
*/
RTEMS_INLINE_ROUTINE bool _Scheduler_Allocate(
const Scheduler_Control *scheduler,
Thread_Control *the_thread
)
{
return ( *scheduler->Operations.allocate )( scheduler, the_thread );
}
/**
* @brief Scheduler free.
*
* This routine frees @a the_thread->scheduler
*/
RTEMS_INLINE_ROUTINE void _Scheduler_Free(
const Scheduler_Control *scheduler,
Thread_Control *the_thread
)
{
( *scheduler->Operations.free )( scheduler, the_thread );
}
/**
* @brief Scheduler update.
*
* This routine updates @a the_thread->scheduler
*/
RTEMS_INLINE_ROUTINE void _Scheduler_Update(
const Scheduler_Control *scheduler,
Thread_Control *the_thread
)
{
( *scheduler->Operations.update )( scheduler, the_thread );
}
/**
* @brief Scheduler enqueue.
*
* This routine enqueue @a the_thread->scheduler
*/
RTEMS_INLINE_ROUTINE void _Scheduler_Enqueue(
const Scheduler_Control *scheduler,
Thread_Control *the_thread
)
{
( *scheduler->Operations.enqueue )( scheduler, the_thread );
}
/**
* @brief Scheduler enqueue first.
*
* This routine enqueue_first @a the_thread->scheduler
*/
RTEMS_INLINE_ROUTINE void _Scheduler_Enqueue_first(
const Scheduler_Control *scheduler,
Thread_Control *the_thread
)
{
( *scheduler->Operations.enqueue_first )( scheduler, the_thread );
}
/**
* @brief Scheduler extract.
*
* This routine extract @a the_thread->scheduler
*/
RTEMS_INLINE_ROUTINE void _Scheduler_Extract(
const Scheduler_Control *scheduler,
Thread_Control *the_thread
)
{
( *scheduler->Operations.extract )( scheduler, the_thread );
}
/**
* @brief Scheduler priority compare.
*
* This routine compares two priorities.
*/
RTEMS_INLINE_ROUTINE int _Scheduler_Priority_compare(
const Scheduler_Control *scheduler,
Priority_Control p1,
Priority_Control p2
)
{
return ( *scheduler->Operations.priority_compare )( p1, p2 );
}
/**
* @brief Scheduler release job.
*
* This routine is called when a new period of task is issued.
*/
RTEMS_INLINE_ROUTINE void _Scheduler_Release_job(
const Scheduler_Control *scheduler,
Thread_Control *the_thread,
uint32_t length
)
{
( *scheduler->Operations.release_job )( scheduler, the_thread, length );
}
/**
* @brief Scheduler method invoked at each clock tick.
*
* This method is invoked at each clock tick to allow the scheduler
* implementation to perform any activities required. For the
* scheduler which support standard RTEMS features, this includes
* time-slicing management.
*/
RTEMS_INLINE_ROUTINE void _Scheduler_Tick(
const Scheduler_Control *scheduler
)
{
( *scheduler->Operations.tick )( scheduler );
}
/**
* @brief Starts the idle thread for a particular processor.
*
* @param[in,out] the_thread The idle thread for the processor.
* @parma[in,out] processor The processor for the idle thread.
*
* @see _Thread_Create_idle().
*/
RTEMS_INLINE_ROUTINE void _Scheduler_Start_idle(
const Scheduler_Control *scheduler,
Thread_Control *the_thread,
Per_CPU_Control *cpu
)
{
( *scheduler->Operations.start_idle )( scheduler, the_thread, cpu );
}
#if defined(__RTEMS_HAVE_SYS_CPUSET_H__) && defined(RTEMS_SMP)
/**
* @brief Obtain the processor affinity for a thread.
*
* @param[in,out] thread The thread.
* @parma[out] cpuset The processor affinity for this thread
*/
RTEMS_INLINE_ROUTINE int _Scheduler_Get_affinity(
const Scheduler_Control *scheduler,
Thread_Control *the_thread,
size_t cpusetsize,
cpu_set_t *cpuset
)
{
return ( *scheduler->Operations.get_affinity )(
scheduler,
the_thread,
cpusetsize,
cpuset
);
}
/**
* @brief Set the processor affinity for a thread.
*
* @param[in,out] thread The thread.
* @parma[in] cpuset The processor affinity for this thread
*/
RTEMS_INLINE_ROUTINE int _Scheduler_Set_affinity(
const Scheduler_Control *scheduler,
Thread_Control *the_thread,
size_t cpusetsize,
const cpu_set_t *cpuset
)
{
return ( *scheduler->Operations.set_affinity )(
scheduler,
the_thread,
cpusetsize,
cpuset
);
}
#endif
RTEMS_INLINE_ROUTINE void _Scheduler_Update_heir(
Thread_Control *heir,
bool force_dispatch
)
{
Thread_Control *executing = _Thread_Executing;
_Thread_Heir = heir;
if ( executing != heir && ( force_dispatch || executing->is_preemptible ) )
_Thread_Dispatch_necessary = true;
}
RTEMS_INLINE_ROUTINE void _Scheduler_Generic_block(
const Scheduler_Control *scheduler,
Thread_Control *the_thread,
void ( *extract )(
const Scheduler_Control *,
Thread_Control * ),
void ( *schedule )(
const Scheduler_Control *,
Thread_Control *,
bool )
)
{
( *extract )( scheduler, the_thread );
/* TODO: flash critical section? */
if ( _Thread_Is_executing( the_thread ) || _Thread_Is_heir( the_thread ) ) {
( *schedule )( scheduler, the_thread, true );
}
}
/**
* @brief Returns true if @p1 encodes a lower priority than @a p2 in the
* intuitive sense of priority.
*/
RTEMS_INLINE_ROUTINE bool _Scheduler_Is_priority_lower_than(
const Scheduler_Control *scheduler,
Priority_Control p1,
Priority_Control p2
)
{
return _Scheduler_Priority_compare( scheduler, p1, p2 ) < 0;
}
/**
* @brief Returns true if @p1 encodes a higher priority than @a p2 in the
* intuitive sense of priority.
*/
RTEMS_INLINE_ROUTINE bool _Scheduler_Is_priority_higher_than(
const Scheduler_Control *scheduler,
Priority_Control p1,
Priority_Control p2
)
{
return _Scheduler_Priority_compare( scheduler, p1, p2 ) > 0;
}
/**
* @brief Returns the priority encoding @a p1 or @a p2 with the higher priority
* in the intuitive sense of priority.
*/
RTEMS_INLINE_ROUTINE Priority_Control _Scheduler_Highest_priority_of_two(
const Scheduler_Control *scheduler,
Priority_Control p1,
Priority_Control p2
)
{
return _Scheduler_Is_priority_higher_than( scheduler, p1, p2 ) ? p1 : p2;
}
/**
* @brief Sets the thread priority to @a priority if it is higher than the
* current priority of the thread in the intuitive sense of priority.
*/
RTEMS_INLINE_ROUTINE void _Scheduler_Set_priority_if_higher(
const Scheduler_Control *scheduler,
Thread_Control *the_thread,
Priority_Control priority
)
{
Priority_Control current = the_thread->current_priority;
if ( _Scheduler_Is_priority_higher_than( scheduler, priority, current ) ) {
_Thread_Set_priority( the_thread, priority );
}
}
/**
* @brief Changes the thread priority to @a priority if it is higher than the
* current priority of the thread in the intuitive sense of priority.
*/
RTEMS_INLINE_ROUTINE void _Scheduler_Change_priority_if_higher(
const Scheduler_Control *scheduler,
Thread_Control *the_thread,
Priority_Control priority,
bool prepend_it
)
{
Priority_Control current = the_thread->current_priority;
if ( _Scheduler_Is_priority_higher_than( scheduler, priority, current ) ) {
_Thread_Change_priority( the_thread, priority, prepend_it );
}
}
RTEMS_INLINE_ROUTINE const Scheduler_Control *_Scheduler_Get(
Thread_Control *the_thread
)
{
(void) the_thread;
return &_Scheduler_Table[ 0 ];
}
/** @} */
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
