------------------------------------------------------------------------------ ------------------------------------------------------------------------------ -- 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) 2002-2020, 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 AUTHORS.txt and SPONSORS.txt -- -- 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 : -- $Rev$ -- $Date$ -- $Author: singhoff $ ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ with unbounded_strings; use unbounded_strings; with Translate; use Translate; package body Scheduler.Time_Sharing_Based_On_Wait_Time is procedure Initialize (A_Tcb : in out Time_Sharing_Based_On_Wait_Time_Tcb) is begin A_Tcb.Last_Time_The_Task_Was_Ready := 0; A_Tcb.Is_Ready := False; end Initialize; function Build_Tcb (My_Scheduler : in Time_Sharing_Based_On_Wait_Time_Scheduler; A_Task : Generic_Task_Ptr) return Tcb_Ptr is A_Tcb : Time_Sharing_Based_On_Wait_Time_Tcb_Ptr; begin A_Tcb := new Time_Sharing_Based_On_Wait_Time_Tcb; Initialize (Tcb (A_Tcb.all), A_Task); Initialize (A_Tcb.all); return Tcb_Ptr (A_Tcb); end Build_Tcb; procedure Initialize (A_Scheduler : in out Time_Sharing_Based_On_Wait_Time_Scheduler) is begin Reset (A_Scheduler); A_Scheduler.parameters.scheduler_type := Time_Sharing_Based_On_Wait_Time_Protocol; end Initialize; function Copy (A_Scheduler : in Time_Sharing_Based_On_Wait_Time_Scheduler) return Generic_Scheduler_Ptr is Ptr : Time_Sharing_Based_On_Wait_Time_Scheduler_Ptr; begin Ptr := new Time_Sharing_Based_On_Wait_Time_Scheduler; Ptr.parameters := A_Scheduler.parameters; Ptr.Previously_Elected := A_Scheduler.Previously_Elected; return Generic_Scheduler_Ptr (Ptr); end Copy; procedure Put (My_Scheduler : in Time_Sharing_Based_On_Wait_Time_Scheduler) is begin Put (Generic_Scheduler (My_Scheduler)); end Put; procedure Check_Before_Scheduling (My_Scheduler : in Time_Sharing_Based_On_Wait_Time_Scheduler; My_Tasks : in Tasks_Set; Processor_Name : in Unbounded_String) is begin null; end Check_Before_Scheduling; procedure Do_Election (My_Scheduler : in out Time_Sharing_Based_On_Wait_Time_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 Oldest_Ready_Task : Natural := Natural'Last; I : Tasks_Range := 0; begin -- For the previously executed task, the waiting time should be updated -- to the current_time (except for the very first unit of time -- if (Current_Time > 0) then Time_Sharing_Based_On_Wait_Time_Tcb_Ptr (Si.Tcbs ( My_Scheduler.Previously_Elected)).Last_Time_The_Task_Was_Ready := Current_Time; end if; -- Check is the task is ready -- if a task is already known to be ready, do not change any thing -- I := 0; loop if not Si.Tcbs (i).already_run_at_current_time then if (Si.Tcbs (I).Tsk.cpu_name = Processor_Name) then if Check_Core_Assignment(My_Scheduler, Si.Tcbs (i)) then if (Si.Tcbs (I).Wake_Up_Time <= Current_Time) and (Si.Tcbs (I).Rest_Of_Capacity /= 0) and ((Options.With_Offsets = False) or Check_Offset (Si.Tcbs (I), Current_Time)) and ((Options.With_Precedencies = False) or Check_Precedencies (Si, Current_Time, Si.Tcbs (I))) then if not Time_Sharing_Based_On_Wait_Time_Tcb_Ptr (Si.Tcbs (I)). Is_Ready then Time_Sharing_Based_On_Wait_Time_Tcb_Ptr (Si.Tcbs (I)). Is_Ready := True; Time_Sharing_Based_On_Wait_Time_Tcb_Ptr (Si.Tcbs (I)). Last_Time_The_Task_Was_Ready := Current_Time; end if; else Time_Sharing_Based_On_Wait_Time_Tcb_Ptr (Si.Tcbs (I)).Is_Ready := False; end if; end if; end if; end if; I := I + 1; exit when Si.Tcbs (I) = null; end loop; -- When last task waiting time are updated, find the task to run -- I := 0; loop if (Si.Tcbs (I).Tsk.cpu_name = Processor_Name) then if Time_Sharing_Based_On_Wait_Time_Tcb_Ptr (Si.Tcbs (I)).Is_Ready then if Time_Sharing_Based_On_Wait_Time_Tcb_Ptr (Si.Tcbs (I)). Last_Time_The_Task_Was_Ready < Oldest_Ready_Task then Oldest_Ready_Task := Time_Sharing_Based_On_Wait_Time_Tcb_Ptr (Si.Tcbs (I)). Last_Time_The_Task_Was_Ready; Elected := I; end if; end if; end if; I := I + 1; exit when Si.Tcbs (I) = null; end loop; if Oldest_Ready_Task = Natural'Last then No_Task := True; else No_Task := False; end if; end Do_Election; procedure Specific_Scheduler_Initialization (My_Scheduler : in out Time_Sharing_Based_On_Wait_Time_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 Compute_Activation_Time (My_Scheduler : in Time_Sharing_Based_On_Wait_Time_Scheduler; Si : in out Scheduling_Information; Elected : in Tasks_Range; Value : in out Natural) is begin raise Invalid_Scheduler; end Compute_Activation_Time; end Scheduler.Time_Sharing_Based_On_Wait_Time;