------------------------------------------------------------------------------ ------------------------------------------------------------------------------ -- 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.capacities.entries(0).values_eu + 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;