Rev 1618 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 961 | pj | 1 | /* |
| 2 | * Project: S.Ha.R.K. |
||
| 3 | * |
||
| 4 | * Coordinators: |
||
| 5 | * Giorgio Buttazzo <giorgio@sssup.it> |
||
| 6 | * Paolo Gai <pj@gandalf.sssup.it> |
||
| 7 | * |
||
| 8 | * Authors : |
||
| 9 | * Paolo Gai <pj@gandalf.sssup.it> |
||
| 10 | * Massimiliano Giorgi <massy@gandalf.sssup.it> |
||
| 11 | * Luca Abeni <luca@gandalf.sssup.it> |
||
| 12 | * (see the web pages for full authors list) |
||
| 13 | * |
||
| 14 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
||
| 15 | * |
||
| 16 | * http://www.sssup.it |
||
| 17 | * http://retis.sssup.it |
||
| 18 | * http://shark.sssup.it |
||
| 19 | */ |
||
| 20 | |||
| 21 | |||
| 22 | /** |
||
| 23 | ------------ |
||
| 24 | CVS : $Id: rr2.h,v 1.1 2005-02-25 10:40:58 pj Exp $ |
||
| 25 | |||
| 26 | File: $File$ |
||
| 27 | Revision: $Revision: 1.1 $ |
||
| 28 | Last update: $Date: 2005-02-25 10:40:58 $ |
||
| 29 | ------------ |
||
| 30 | |||
| 31 | This file contains the scheduling module RR (Round Robin) |
||
| 32 | |||
| 33 | Title: |
||
| 34 | RR (Round Robin) version 2 |
||
| 35 | |||
| 36 | Task Models Accepted: |
||
| 37 | NRT_TASK_MODEL - Non-Realtime Tasks |
||
| 38 | weight field is ignored |
||
| 39 | slice field is used to set the slice of a task, if it is !=0 |
||
| 40 | policy field is ignored |
||
| 41 | inherit field is ignored |
||
| 42 | |||
| 43 | Description: |
||
| 44 | This module schedule his tasks following the classic round-robin |
||
| 45 | scheme. The default timeslice is given at registration time and is a |
||
| 46 | a per-task specification. The default timeslice is used if the slice |
||
| 47 | field in the NRT_TASK_MODEL is 0. |
||
| 48 | |||
| 49 | The module can SAVE or SKIP activations |
||
| 50 | There is another module, RR, thar always SKIP activations... |
||
| 51 | |||
| 52 | Exceptions raised: |
||
| 53 | XUNVALID_GUEST |
||
| 54 | This level doesn't support guests. When a guest operation |
||
| 55 | is called, the exception is raised. |
||
| 56 | |||
| 57 | Restrictions & special features: |
||
| 58 | - if specified, it creates at init time a task, |
||
| 59 | called "Main", attached to the function __init__(). |
||
| 60 | - There must be only one module in the system that creates a task |
||
| 61 | attached to the function __init__(). |
||
| 62 | - The level tries to guarantee that a task uses a "full" timeslice |
||
| 63 | before going to the queue tail. "full" means that a task can execute |
||
| 64 | a maximum time of slice+sys_tick due to the approx. done by |
||
| 65 | the Virtual Machine. If a task execute more time than the slice, |
||
| 66 | the next time it execute less... |
||
| 67 | |||
| 68 | **/ |
||
| 69 | |||
| 70 | /* |
||
| 71 | * Copyright (C) 2000 Paolo Gai |
||
| 72 | * |
||
| 73 | * This program is free software; you can redistribute it and/or modify |
||
| 74 | * it under the terms of the GNU General Public License as published by |
||
| 75 | * the Free Software Foundation; either version 2 of the License, or |
||
| 76 | * (at your option) any later version. |
||
| 77 | * |
||
| 78 | * This program is distributed in the hope that it will be useful, |
||
| 79 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
||
| 80 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
||
| 81 | * GNU General Public License for more details. |
||
| 82 | * |
||
| 83 | * You should have received a copy of the GNU General Public License |
||
| 84 | * along with this program; if not, write to the Free Software |
||
| 85 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
||
| 86 | * |
||
| 87 | */ |
||
| 88 | |||
| 89 | |||
| 90 | #ifndef __RR2_H__ |
||
| 91 | #define __RR2_H__ |
||
| 92 | |||
| 93 | #include <ll/ll.h> |
||
| 94 | #include <kernel/config.h> |
||
| 95 | #include <sys/types.h> |
||
| 96 | #include <kernel/types.h> |
||
| 1621 | fabio | 97 | #include <arch/sys/cdefs.h> |
| 961 | pj | 98 | |
| 99 | __BEGIN_DECLS |
||
| 100 | |||
| 101 | extern TASK __init__(void *arg); |
||
| 102 | |||
| 103 | |||
| 104 | |||
| 105 | /*+ Const: +*/ |
||
| 106 | #define RR2_MINIMUM_SLICE 1000 /*+ Minimum Timeslice +*/ |
||
| 107 | #define RR2_MAXIMUM_SLICE 500000 /*+ Maximum Timeslice +*/ |
||
| 108 | |||
| 109 | #define RR2_MAIN_YES 1 /*+ The level creates the main +*/ |
||
| 110 | #define RR2_MAIN_NO 0 /*+ The level does'nt create the main +*/ |
||
| 111 | |||
| 112 | /*+ Registration function: |
||
| 113 | TIME slice the slice for the Round Robin queue |
||
| 114 | int createmain 1 if the level creates the main task 0 otherwise |
||
| 115 | struct multiboot_info *b used if createmain specified |
||
| 116 | |||
| 117 | returns the level number at which the module has been registered. |
||
| 118 | +*/ |
||
| 119 | LEVEL RR2_register_level(TIME slice, |
||
| 120 | int createmain, |
||
| 121 | struct multiboot_info *mb); |
||
| 122 | |||
| 123 | __END_DECLS |
||
| 124 | #endif |