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241 | ------------------------------------------------------------------------------
------------------------------------------------------------------------------
-- Cheddar is a GNU GPL real-time scheduling analysis tool.
-- This program provides services to automatically check schedulability and
-- other performance criteria of real-time architecture models.
--
-- Copyright (C) 2002-2023, Frank Singhoff, Alain Plantec, Jerome Legrand,
-- Hai Nam Tran, Stephane Rubini
--
-- The Cheddar project was started in 2002 by
-- Frank Singhoff, Lab-STICC UMR 6285, Université de Bretagne Occidentale
--
-- Cheddar has been published in the "Agence de Protection des Programmes/France" in 2008.
-- Since 2008, Ellidiss technologies also contributes to the development of
-- Cheddar and provides industrial support.
--
-- The full list of contributors and sponsors can be found in README.md
--
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation; either version 2 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
--
--
-- Contact : cheddar@listes.univ-brest.fr
--
------------------------------------------------------------------------------
-- Last update :
-- $Rev: 3520 $
-- $Date: 2020-07-23 12:44:45 +0200 (Thu, 23 Jul 2020) $
-- $Author: singhoff $
------------------------------------------------------------------------------
------------------------------------------------------------------------------
with scheduler; use scheduler;
with Scheduling_Analysis; use Scheduling_Analysis;
use Scheduling_Analysis.Double_Tasks_Parameters_Package;
with scheduler.fixed_priority; use scheduler.fixed_priority;
with scheduler.fixed_priority.hpf; use scheduler.fixed_priority.hpf;
with Text_IO; use Text_IO;
with debug; use debug;
with xml_tag; use xml_tag;
with double_util; use double_util;
with translate; use translate;
with unbounded_strings; use unbounded_strings;
with systems; use systems;
with Ada.Tags; use Ada.Tags;
package body scheduler.mixed_criticality.edf_vd is
procedure initialize
(a_scheduler : in out mixed_criticality_edf_vd_scheduler)
is
begin
reset (a_scheduler);
a_scheduler.parameters.scheduler_type :=
mixed_criticality_edf_vd_protocol;
end initialize;
function copy
(a_scheduler : in mixed_criticality_edf_vd_scheduler)
return generic_scheduler_ptr
is
ptr : mixed_criticality_edf_vd_scheduler_ptr;
begin
ptr := new mixed_criticality_edf_vd_scheduler;
ptr.parameters := a_scheduler.parameters;
ptr.previously_elected := a_scheduler.previously_elected;
return generic_scheduler_ptr (ptr);
end copy;
procedure check_before_scheduling
(my_scheduler : in mixed_criticality_edf_vd_scheduler;
my_tasks : in tasks_set;
processor_name : in Unbounded_String)
is
begin
null;
end check_before_scheduling;
procedure specific_scheduler_initialization
(my_scheduler : in out mixed_criticality_edf_vd_scheduler;
si : in out scheduling_information;
processor_name : in Unbounded_String;
address_space_name : in Unbounded_String;
my_tasks : in out tasks_set;
my_schedulers : in scheduler_table;
my_resources : in out resources_set;
my_buffers : in out buffers_set;
my_messages : in messages_set;
msg : in out Unbounded_String)
is
begin
null;
end specific_scheduler_initialization;
procedure do_election
(my_scheduler : in out mixed_criticality_edf_vd_scheduler;
si : in out scheduling_information;
result : in out scheduling_sequence_ptr;
msg : in out Unbounded_String;
current_time : in Natural;
processor_name : in Unbounded_String;
address_space_name : in Unbounded_String;
core_name : in Unbounded_String;
options : in scheduling_option;
event_to_generate : in time_unit_event_type_boolean_table;
elected : in out tasks_range;
no_task : in out Boolean)
is
smallest_deadline : Natural := Natural'last;
i : tasks_range := 0;
is_ready : Boolean := False;
previous_task_can_be_run : Boolean := False;
is_critical : Boolean := False;
begin
put_debug ("Call Do_Election: EDF_VD");
loop
if (si.tcbs (i).tsk.cpu_name = processor_name) then
mixed_criticality_tcb_ptr (si.tcbs (i)).dynamic_deadline :=
si.tcbs (i).wake_up_time + si.tcbs (i).tsk.deadline;
end if;
-- We check if a low WCET of a task exceed its time
if
((si.tcbs (i).tsk.capacity_low + si.tcbs (i).wake_up_time) <
current_time)
then
is_critical := True;
si.tcbs (i).tsk.criticality := 2;
end if;
if not si.tcbs (i).already_run_at_current_time then
if (si.tcbs (i).tsk.cpu_name = processor_name) then
-- We check if there is a task in critical mode
if (is_critical) then
-- We check if the task we are looking is critical
if (si.tcbs (i).tsk.criticality = 2) then
if (si.tcbs (i).wake_up_time <= current_time) and
(si.tcbs (i).rest_of_capacity /= 0)
then
-- We calculate the smallest deadline between critical tasks
if
(mixed_criticality_tcb_ptr (si.tcbs (i))
.dynamic_deadline <
smallest_deadline)
then
-- We elect the task with the smallest deadline
smallest_deadline := 0;
elected := i;
si.tcbs (i).tsk.criticality := 1;
end if;
end if;
end if;
else
-- Same thing as above but there is no critical task
if (si.tcbs (i).wake_up_time <= current_time) and
(si.tcbs (i).rest_of_capacity /= 0)
then
if (options.with_offsets = False) or
check_offset (si.tcbs (i), current_time)
then
if (options.with_precedencies = False) or
check_precedencies (si, current_time, si.tcbs (i))
then
if i = my_scheduler.previously_elected then
previous_task_can_be_run := True;
end if;
-- We calculate the smallest deadline between critical tasks
if
(mixed_criticality_tcb_ptr (si.tcbs (i))
.dynamic_deadline <
smallest_deadline)
then
-- We elect the task with the smallest deadline
smallest_deadline :=
mixed_criticality_tcb_ptr (si.tcbs (i))
.dynamic_deadline;
elected := i;
si.tcbs (i).tsk.criticality := 1;
end if;
end if;
end if;
end if;
end if;
end if;
end if;
i := i + 1;
--is_critical := False;
exit when si.tcbs (i) = null;
end loop;
if smallest_deadline = Natural'last then
no_task := True;
else
no_task := False;
end if;
-- By default, as task are sorted in the set according to their name
-- when we have two tasks with the same absolute deadline, we choose the first one
-- in the task set, i.e. the task with the smallest name.
-- This strategy can be useful has it provides a simple mean to introduce a
-- tie break as a kind of fixed priority.
-- However, it may introduce an extra preemption.
-- If we want to reduce preemption number as much as possible, in this case
-- we select the previous task ... in this task can be run again !
--
if options.with_minimize_preemption and previous_task_can_be_run then
if mixed_criticality_tcb_ptr
(si.tcbs (my_scheduler.previously_elected))
.dynamic_deadline =
smallest_deadline
then
elected := my_scheduler.previously_elected;
put_debug ("Call Do_Election: EDF : Minimize preemption");
end if;
end if;
put_debug ("Call Do_Election: EDF : Elected : " & elected'img);
end do_election;
end scheduler.mixed_criticality.edf_vd;
|