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| 961 | 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: rrsoft.h,v 1.1 2005-02-25 10:55:09 pj Exp $ |
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| 25 | |||
| 26 | File: $File$ |
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| 27 | Revision: $Revision: 1.1 $ |
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| 28 | Last update: $Date: 2005-02-25 10:55:09 $ |
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| 29 | ------------ |
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| 30 | |||
| 31 | This file contains the scheduling module RRSOFT (Round Robin for |
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| 32 | Hard & Soft Model) |
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| 33 | |||
| 34 | Title: |
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| 35 | RRSOFT (Round Robin) version 1 |
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| 36 | |||
| 37 | Task Models Accepted: |
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| 38 | NRT_TASK_MODEL - Non-Realtime Tasks |
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| 39 | weight field is ignored |
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| 40 | slice field is used to set the slice of a task, if it is !=0 |
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| 41 | policy field is ignored |
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| 42 | inherit field is ignored |
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| 43 | SOFT_TASK_MODEL - Soft tasks |
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| 44 | only the periodicity and the met are used. |
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| 45 | HARD_TASK_MODEL - Hard tasks |
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| 46 | only the periodicity and the period are used. |
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| 47 | |||
| 48 | |||
| 49 | Description: |
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| 50 | This module schedule his tasks following the classic round-robin |
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| 51 | scheme. The default timeslice is given at registration time and is a |
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| 52 | a per-task specification. The default timeslice is used if the slice |
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| 53 | field in the NRT_TASK_MODEL is 0. |
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| 54 | |||
| 55 | The module can SAVE or SKIP activations |
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| 56 | There is another module, RR, thar always SKIP activations... |
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| 57 | |||
| 58 | The Module is derived from the RRSOFT, and it accepts only one |
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| 59 | kind of task Model (hard, soft or nrt). |
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| 60 | |||
| 61 | Exceptions raised: |
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| 62 | XUNVALID_GUEST |
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| 63 | This level doesn't support guests. When a guest operation |
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| 64 | is called, the exception is raised. |
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| 65 | |||
| 66 | Restrictions & special features: |
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| 67 | - if specified, it creates at init time a task, |
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| 68 | called "Main", attached to the function __init__(). |
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| 69 | - There must be only one module in the system that creates a task |
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| 70 | attached to the function __init__(). |
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| 71 | - The level tries to guarantee that a task uses a "full" timeslice |
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| 72 | before going to the queue tail. "full" means that a task can execute |
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| 73 | a maximum time of slice+sys_tick due to the approx. done by |
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| 74 | the Virtual Machine. If a task execute more time than the slice, |
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| 75 | the next time it execute less... |
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| 76 | |||
| 77 | **/ |
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| 78 | |||
| 79 | /* |
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| 80 | * Copyright (C) 2000 Paolo Gai |
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| 81 | * |
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| 82 | * This program is free software; you can redistribute it and/or modify |
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| 83 | * it under the terms of the GNU General Public License as published by |
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| 84 | * the Free Software Foundation; either version 2 of the License, or |
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| 85 | * (at your option) any later version. |
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| 86 | * |
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| 87 | * This program is distributed in the hope that it will be useful, |
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| 88 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 89 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 90 | * GNU General Public License for more details. |
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| 91 | * |
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| 92 | * You should have received a copy of the GNU General Public License |
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| 93 | * along with this program; if not, write to the Free Software |
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| 94 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 95 | * |
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| 96 | */ |
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| 97 | |||
| 98 | |||
| 99 | #ifndef __RRSOFT_H__ |
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| 100 | #define __RRSOFT_H__ |
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| 101 | |||
| 102 | #include <ll/ll.h> |
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| 103 | #include <kernel/config.h> |
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| 104 | #include <sys/types.h> |
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| 105 | #include <kernel/types.h> |
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| 106 | #include "ll/sys/cdefs.h" |
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| 107 | |||
| 108 | __BEGIN_DECLS |
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| 109 | |||
| 110 | extern TASK __init__(void *arg); |
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| 111 | |||
| 112 | |||
| 113 | |||
| 114 | /*+ Const: +*/ |
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| 115 | #define RRSOFT_MINIMUM_SLICE 1000 /*+ Minimum Timeslice +*/ |
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| 116 | #define RRSOFT_MAXIMUM_SLICE 500000 /*+ Maximum Timeslice +*/ |
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| 117 | |||
| 118 | #define RRSOFT_MAIN_YES 1 /*+ The level creates the main +*/ |
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| 119 | #define RRSOFT_MAIN_NO 0 /*+ The level does'nt create the main +*/ |
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| 120 | |||
| 121 | #define RRSOFT_ONLY_HARD 1 /*+ The level accepts only Hard Tasks +*/ |
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| 122 | #define RRSOFT_ONLY_SOFT 2 /*+ The level accepts only Soft Tasks +*/ |
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| 123 | #define RRSOFT_ONLY_NRT 4 /*+ The level accepts only NRT Tasks +*/ |
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| 124 | |||
| 125 | |||
| 126 | /*+ Registration function: |
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| 127 | TIME slice the slice for the Round Robin queue |
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| 128 | int createmain 1 if the level creates the main task 0 otherwise |
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| 129 | struct multiboot_info *mb used if createmain specified |
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| 130 | |||
| 131 | returns the level number at which the module has been registered. |
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| 132 | +*/ |
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| 133 | |||
| 134 | LEVEL RRSOFT_register_level(TIME slice, |
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| 135 | int createmain, |
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| 136 | struct multiboot_info *mb, |
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| 137 | BYTE models); |
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| 138 | |||
| 139 | __END_DECLS |
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| 140 | #endif |