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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: rr.h,v 1.1 2005-02-25 10:45:58 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 10:45:58 $ |
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| 29 | ------------ |
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| 30 | |||
| 31 | This file contains the scheduling module RR (Round Robin) |
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| 32 | |||
| 33 | Title: |
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| 34 | RR (Round Robin) |
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| 35 | |||
| 36 | Task Models Accepted: |
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| 37 | NRT_TASK_MODEL - Non-Realtime Tasks |
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| 38 | weight field is ignored |
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| 39 | slice field is used to set the slice of a task, if it is !=0 |
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| 40 | activation field is ignored |
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| 41 | policy field is ignored |
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| 42 | inherit field is ignored |
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| 43 | |||
| 44 | Description: |
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| 45 | This module schedule his tasks following the classic round-robin |
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| 46 | scheme. The default timeslice is given at registration time and is a |
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| 47 | a per-task specification. The default timeslice is used if the slice |
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| 48 | field in the NRT_TASK_MODEL is 0. |
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| 49 | |||
| 50 | The module always SKIP instances, either if SAVE_ARRIVALS is set!!! |
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| 51 | There is another module, RR2, thar remember activations... |
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| 52 | |||
| 53 | Exceptions raised: |
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| 54 | XUNVALID_GUEST |
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| 55 | This level doesn't support guests. When a guest operation |
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| 56 | is called, the exception is raised. |
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| 57 | |||
| 58 | Restrictions & special features: |
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| 59 | - if specified, it creates at init time a task, |
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| 60 | called "Main", attached to the function __init__(). |
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| 61 | - There must be only one module in the system that creates a task |
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| 62 | attached to the function __init__(). |
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| 63 | - The level tries to guarantee that a task uses a "full" timeslice |
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| 64 | before going to the queue tail. "full" means that a task can execute |
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| 65 | a maximum time of slice+sys_tick due to the approx. done by |
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| 66 | the Virtual Machine. If a task execute more time than the slice, |
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| 67 | the next time it execute less... |
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| 68 | |||
| 69 | **/ |
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| 70 | |||
| 71 | /* |
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| 72 | * Copyright (C) 2000 Paolo Gai |
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| 73 | * |
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| 74 | * This program is free software; you can redistribute it and/or modify |
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| 75 | * it under the terms of the GNU General Public License as published by |
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| 76 | * the Free Software Foundation; either version 2 of the License, or |
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| 77 | * (at your option) any later version. |
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| 78 | * |
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| 79 | * This program is distributed in the hope that it will be useful, |
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| 80 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 81 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 82 | * GNU General Public License for more details. |
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| 83 | * |
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| 84 | * You should have received a copy of the GNU General Public License |
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| 85 | * along with this program; if not, write to the Free Software |
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| 86 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 87 | * |
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| 88 | */ |
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| 89 | |||
| 90 | |||
| 91 | #ifndef __RR_H__ |
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| 92 | #define __RR_H__ |
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| 93 | |||
| 94 | #include <ll/ll.h> |
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| 95 | #include <kernel/config.h> |
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| 96 | #include <sys/types.h> |
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| 97 | #include <kernel/types.h> |
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| 98 | #include "ll/sys/cdefs.h" |
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| 99 | |||
| 100 | __BEGIN_DECLS |
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| 101 | |||
| 102 | extern TASK __init__(void *arg); |
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| 103 | |||
| 104 | |||
| 105 | |||
| 106 | /*+ Const: +*/ |
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| 107 | #define RR_MINIMUM_SLICE 1000 /*+ Minimum Timeslice +*/ |
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| 108 | #define RR_MAXIMUM_SLICE 500000 /*+ Maximum Timeslice +*/ |
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| 109 | |||
| 110 | #define RR_MAIN_YES 1 /*+ The level creates the main +*/ |
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| 111 | #define RR_MAIN_NO 0 /*+ The level does'nt create the main +*/ |
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| 112 | |||
| 113 | /*+ Registration function: |
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| 114 | TIME slice the slice for the Round Robin queue |
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| 115 | int createmain 1 if the level creates the main task 0 otherwise |
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| 116 | struct multiboot_info *mb used if createmain specified |
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| 117 | |||
| 118 | returns the level number at which the module has been registered. |
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| 119 | +*/ |
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| 120 | LEVEL RR_register_level(TIME slice, |
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| 121 | int createmain, |
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| 122 | struct multiboot_info *mb); |
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| 123 | __END_DECLS |
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| 124 | #endif |