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/*
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 * Project: S.Ha.R.K.
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 *
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 * Coordinators:
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 *   Giorgio Buttazzo    <giorgio@sssup.it>
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *
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 * Authors     :
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *   Massimiliano Giorgi <massy@gandalf.sssup.it>
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 *   Luca Abeni          <luca@gandalf.sssup.it>
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 *   (see the web pages for full authors list)
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 *
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 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
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 *
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 * http://www.sssup.it
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 * http://retis.sssup.it
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 * http://shark.sssup.it
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 */
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/**
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 ------------
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 CVS :        $Id: ds.h,v 1.3 2003-03-13 13:39:04 pj Exp $
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 File:        $File$
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 Revision:    $Revision: 1.3 $
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 Last update: $Date: 2003-03-13 13:39:04 $
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 ------------
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 This file contains the aperiodic server DS (Polling Server)
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 Title:
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   DS (Deferrable Server)
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 Task Models Accepted:
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   SOFT_TASK_MODEL - Soft Tasks
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     wcet field is ignored
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     met field is ignored
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     period field is ignored
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     periodicity field can be only APERIODIC
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     arrivals field can be either SAVE or SKIP
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 Description:
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   This module schedule his tasks following the Deferrable Server scheme.
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   All the tasks are put in a FIFO (FCFS) queue and at a time only the first
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   task in the queue is put in the upper level.
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   The module remembers pending activations when calling task_sleep...
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 Exceptions raised:
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   XUNVALID_GUEST
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     This level doesn't support guests. When a guest operation
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     is called, the exception is raised.
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 Restrictions & special features:
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   - This level doesn't manage the main task.
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   - At init time we have to specify:
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     . The Capacity and the period used by the server
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   - The level don't use the priority field.
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   - A function to return the used bandwidth of the level is provided.
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   - if an aperiodic task calls a task_delay when owning a mutex implemented
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     with shadows, the delay may have no effect, so don't use delay when
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     using a mutex!!!
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**/
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/*
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 * Copyright (C) 2000 Paolo Gai
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 */
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#ifndef __DS_H__
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#define __DS_H__
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#include <kernel/config.h>
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#include <sys/types.h>
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#include <kernel/types.h>
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#include "ll/sys/cdefs.h"
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__BEGIN_DECLS
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/*+ 1 - ln(2) +*/
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#ifndef RM_MINFREEBANDWIDTH
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#define RM_MINFREEBANDWIDTH 1317922825
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#endif
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/*+ flags... +*/
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#define DS_DISABLE_ALL           0
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#define DS_ENABLE_BACKGROUND     1  /*+ Background scheduling enabled +*/
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#define DS_ENABLE_GUARANTEE_EDF  2  /*+ Task Guarantee enabled +*/
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#define DS_ENABLE_ALL_EDF        3  /*+ All flags enabled      +*/
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#define DS_ENABLE_GUARANTEE_RM   4  /*+ Task Guarantee enabled +*/
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#define DS_ENABLE_ALL_RM         5  /*+ All flags enabled      +*/
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/*+ internal flags +*/
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#define DS_BACKGROUND            8  /*+ this flag is set when scheduling
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                                        in background +*/
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#define DS_BACKGROUND_BLOCK     16  /*+ this flag is set when we want to
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                                        blocks the background scheduling +*/
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/*+ Registration function:
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    bandwidth_t b Max bandwidth used by the TBS
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    int flags     Options to be used in this level instance...
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    LEVEL master  the level that must be used as master level for the
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                  TBS tasks
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    int num,den   used to compute the TBS bandwidth
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    returns the level number at which the module has been registered.
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+*/
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LEVEL DS_register_level(int flags, LEVEL master, int Cs, int per);
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/*+ Returns the used bandwidth of a level +*/
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bandwidth_t DS_usedbandwidth(LEVEL l);
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__END_DECLS
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#endif