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/**
* @file
*
* @ingroup RTEMSScoreSchedulerCBS
*
* @brief This source file contains the implementation of
* _Scheduler_CBS_Unblock().
*/
/*
* 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/scheduleredfimpl.h>
#include <rtems/score/schedulerimpl.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/watchdogimpl.h>
void _Scheduler_CBS_Unblock(
const Scheduler_Control *scheduler,
Thread_Control *the_thread,
Scheduler_Node *node
)
{
Scheduler_CBS_Node *the_node;
Scheduler_CBS_Server *serv_info;
Priority_Control priority;
the_node = _Scheduler_CBS_Node_downcast( node );
serv_info = the_node->cbs_server;
priority = _Scheduler_Node_get_priority( &the_node->Base.Base );
priority = SCHEDULER_PRIORITY_PURIFY( priority );
/*
* Late unblock rule for deadline-driven tasks. The remaining time to
* deadline must be sufficient to serve the remaining computation time
* without increased utilization of this task. It might cause a deadline
* miss of another task.
*/
if ( serv_info != NULL && ( priority & SCHEDULER_EDF_PRIO_MSB ) == 0 ) {
time_t deadline = serv_info->parameters.deadline;
time_t budget = serv_info->parameters.budget;
uint32_t deadline_left = the_thread->CPU_budget.available;
Priority_Control budget_left = priority - _Watchdog_Ticks_since_boot;
if ( deadline * budget_left > budget * deadline_left ) {
Thread_queue_Context queue_context;
/* Put late unblocked task to background until the end of period. */
_Thread_queue_Context_clear_priority_updates( &queue_context );
_Scheduler_CBS_Cancel_job(
scheduler,
the_thread,
the_node->deadline_node,
&queue_context
);
}
}
_Scheduler_EDF_Unblock( scheduler, the_thread, &the_node->Base.Base );
}
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