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| 2 | pj | 1 | /* |
| 2 | * Project: S.Ha.R.K. |
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| 3 | * |
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| 4 | * Coordinators: |
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| 5 | * Giorgio Buttazzo <giorgio@sssup.it> |
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| 6 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 7 | * |
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| 8 | * Authors : |
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| 9 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 10 | * Massimiliano Giorgi <massy@gandalf.sssup.it> |
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| 11 | * Luca Abeni <luca@gandalf.sssup.it> |
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| 12 | * (see the web pages for full authors list) |
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| 13 | * |
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| 14 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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| 15 | * |
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| 16 | * http://www.sssup.it |
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| 17 | * http://retis.sssup.it |
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| 18 | * http://shark.sssup.it |
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| 19 | */ |
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| 20 | |||
| 21 | |||
| 22 | /** |
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| 23 | ------------ |
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| 24 | CVS : $Id: ds.h,v 1.1.1.1 2002-03-29 14:12:51 pj Exp $ |
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| 25 | |||
| 26 | File: $File$ |
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| 27 | Revision: $Revision: 1.1.1.1 $ |
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| 28 | Last update: $Date: 2002-03-29 14:12:51 $ |
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| 29 | ------------ |
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| 30 | |||
| 31 | This file contains the aperiodic server DS (Polling Server) |
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| 32 | |||
| 33 | Title: |
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| 34 | DS (Deferrable Server) |
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| 35 | |||
| 36 | Task Models Accepted: |
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| 37 | SOFT_TASK_MODEL - Soft Tasks |
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| 38 | wcet field is ignored |
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| 39 | met field is ignored |
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| 40 | period field is ignored |
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| 41 | periodicity field can be only APERIODIC |
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| 42 | arrivals field can be either SAVE or SKIP |
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| 43 | |||
| 44 | Description: |
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| 45 | This module schedule his tasks following the Deferrable Server scheme. |
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| 46 | |||
| 47 | All the tasks are put in a FIFO (FCFS) queue and at a time only the first |
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| 48 | task in the queue is put in the upper level. |
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| 49 | |||
| 50 | The module remembers pending activations when calling task_sleep... |
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| 51 | |||
| 52 | Exceptions raised: |
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| 53 | XUNVALID_GUEST |
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| 54 | This level doesn't support guests. When a guest operation |
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| 55 | is called, the exception is raised. |
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| 56 | |||
| 57 | Restrictions & special features: |
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| 58 | - This level doesn't manage the main task. |
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| 59 | - At init time we have to specify: |
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| 60 | . The Capacity and the period used by the server |
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| 61 | - The level don't use the priority field. |
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| 62 | - A function to return the used bandwidth of the level is provided. |
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| 63 | - if an aperiodic task calls a task_delay when owning a mutex implemented |
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| 64 | with shadows, the delay may have no effect, so don't use delay when |
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| 65 | using a mutex!!! |
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| 66 | |||
| 67 | **/ |
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| 68 | |||
| 69 | /* |
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| 70 | * Copyright (C) 2000 Paolo Gai |
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| 71 | * |
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| 72 | * This program is free software; you can redistribute it and/or modify |
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| 73 | * it under the terms of the GNU General Public License as published by |
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| 74 | * the Free Software Foundation; either version 2 of the License, or |
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| 75 | * (at your option) any later version. |
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| 76 | * |
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| 77 | * This program is distributed in the hope that it will be useful, |
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| 78 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 79 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 80 | * GNU General Public License for more details. |
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| 81 | * |
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| 82 | * You should have received a copy of the GNU General Public License |
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| 83 | * along with this program; if not, write to the Free Software |
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| 84 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 85 | * |
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| 86 | */ |
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| 87 | |||
| 88 | |||
| 89 | #ifndef __DS_H__ |
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| 90 | #define __DS_H__ |
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| 91 | |||
| 92 | #include <kernel/config.h> |
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| 93 | #include <sys/types.h> |
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| 94 | #include <kernel/types.h> |
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| 95 | #include <modules/codes.h> |
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| 96 | |||
| 97 | /*+ 1 - ln(2) +*/ |
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| 98 | #ifndef RM_MINFREEBANDWIDTH |
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| 99 | #define RM_MINFREEBANDWIDTH 1317922825 |
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| 100 | #endif |
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| 101 | |||
| 102 | /*+ flags... +*/ |
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| 103 | #define DS_DISABLE_ALL 0 |
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| 104 | #define DS_ENABLE_BACKGROUND 1 /*+ Background scheduling enabled +*/ |
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| 105 | #define DS_ENABLE_GUARANTEE_EDF 2 /*+ Task Guarantee enabled +*/ |
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| 106 | #define DS_ENABLE_ALL_EDF 3 /*+ All flags enabled +*/ |
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| 107 | |||
| 108 | #define DS_ENABLE_GUARANTEE_RM 4 /*+ Task Guarantee enabled +*/ |
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| 109 | #define DS_ENABLE_ALL_RM 5 /*+ All flags enabled +*/ |
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| 110 | |||
| 111 | /*+ internal flags +*/ |
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| 112 | #define DS_BACKGROUND 8 /*+ this flag is set when scheduling |
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| 113 | in background +*/ |
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| 114 | #define DS_BACKGROUND_BLOCK 16 /*+ this flag is set when we want to |
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| 115 | blocks the background scheduling +*/ |
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| 116 | |||
| 117 | /*+ Registration function: |
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| 118 | bandwidth_t b Max bandwidth used by the TBS |
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| 119 | int flags Options to be used in this level instance... |
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| 120 | LEVEL master the level that must be used as master level for the |
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| 121 | TBS tasks |
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| 122 | int num,den used to compute the TBS bandwidth +*/ |
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| 123 | void DS_register_level(int flags, LEVEL master, int Cs, int per); |
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| 124 | |||
| 125 | /*+ Returns the used bandwidth of a level +*/ |
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| 126 | bandwidth_t DS_usedbandwidth(LEVEL l); |
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| 127 | |||
| 128 | #endif |