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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @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).
*
* 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.
*/
#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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