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/**
* @file
*
* @ingroup RTEMSScoreSchedulerCBS
*
* @brief This source file contains the implementation of
* _Scheduler_CBS_Budget_callout() and _Scheduler_CBS_Initialize().
*/
/*
* Copyright (C) 2011 Petr Benes.
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/schedulercbsimpl.h>
#include <rtems/score/statesimpl.h>
#include <rtems/score/threadcpubudget.h>
/**
* @brief Invoked when a limited time quantum is exceeded.
*
* This routine is invoked when a limited time quantum is exceeded.
*
* @param the_thread The thread that exceeded a limited time quantum.
*/
static void _Scheduler_CBS_Budget_callout( Thread_Control *the_thread )
{
Scheduler_CBS_Node *node;
Scheduler_CBS_Server_id server_id;
Thread_queue_Context queue_context;
node = _Scheduler_CBS_Thread_get_node( the_thread );
/* Put violating task to background until the end of period. */
_Thread_queue_Context_clear_priority_updates( &queue_context );
_Scheduler_CBS_Cancel_job(
NULL,
the_thread,
node->deadline_node,
&queue_context
);
_Thread_Priority_update( &queue_context );
/* Invoke callback function if any. */
if ( node->cbs_server->cbs_budget_overrun ) {
_Scheduler_CBS_Get_server_id(
node->cbs_server->task_id,
&server_id
);
node->cbs_server->cbs_budget_overrun( server_id );
}
}
static void _Scheduler_CBS_Budget_at_tick( Thread_Control *the_thread )
{
uint32_t budget_available;
if ( !the_thread->is_preemptible ) {
return;
}
if ( !_States_Is_ready( the_thread->current_state ) ) {
return;
}
budget_available = the_thread->CPU_budget.available;
if ( budget_available == 1 ) {
the_thread->CPU_budget.available = 0;
_Scheduler_CBS_Budget_callout ( the_thread );
} else {
the_thread->CPU_budget.available = budget_available - 1;
}
}
const Thread_CPU_budget_operations _Scheduler_CBS_Budget = {
.at_tick = _Scheduler_CBS_Budget_at_tick,
.at_context_switch = _Thread_CPU_budget_do_nothing,
.initialize = _Thread_CPU_budget_do_nothing
};
int _Scheduler_CBS_Initialize(void)
{
return SCHEDULER_CBS_OK;
}
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