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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: rr2.h,v 1.1 2005-02-25 10:40:58 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 10:40:58 $ |
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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) version 2 |
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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 | policy field is ignored |
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41 | inherit field is ignored |
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42 | |||
43 | Description: |
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44 | This module schedule his tasks following the classic round-robin |
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45 | scheme. The default timeslice is given at registration time and is a |
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46 | a per-task specification. The default timeslice is used if the slice |
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47 | field in the NRT_TASK_MODEL is 0. |
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48 | |||
49 | The module can SAVE or SKIP activations |
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50 | There is another module, RR, thar always SKIP activations... |
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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 | - if specified, it creates at init time a task, |
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59 | called "Main", attached to the function __init__(). |
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60 | - There must be only one module in the system that creates a task |
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61 | attached to the function __init__(). |
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62 | - The level tries to guarantee that a task uses a "full" timeslice |
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63 | before going to the queue tail. "full" means that a task can execute |
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64 | a maximum time of slice+sys_tick due to the approx. done by |
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65 | the Virtual Machine. If a task execute more time than the slice, |
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66 | the next time it execute less... |
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67 | |||
68 | **/ |
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69 | |||
70 | /* |
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71 | * Copyright (C) 2000 Paolo Gai |
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72 | * |
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73 | * This program is free software; you can redistribute it and/or modify |
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74 | * it under the terms of the GNU General Public License as published by |
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75 | * the Free Software Foundation; either version 2 of the License, or |
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76 | * (at your option) any later version. |
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77 | * |
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78 | * This program is distributed in the hope that it will be useful, |
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79 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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80 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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81 | * GNU General Public License for more details. |
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82 | * |
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83 | * You should have received a copy of the GNU General Public License |
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84 | * along with this program; if not, write to the Free Software |
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85 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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86 | * |
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87 | */ |
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88 | |||
89 | |||
90 | #ifndef __RR2_H__ |
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91 | #define __RR2_H__ |
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92 | |||
93 | #include <ll/ll.h> |
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94 | #include <kernel/config.h> |
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95 | #include <sys/types.h> |
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96 | #include <kernel/types.h> |
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97 | #include "ll/sys/cdefs.h" |
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98 | |||
99 | __BEGIN_DECLS |
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100 | |||
101 | extern TASK __init__(void *arg); |
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102 | |||
103 | |||
104 | |||
105 | /*+ Const: +*/ |
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106 | #define RR2_MINIMUM_SLICE 1000 /*+ Minimum Timeslice +*/ |
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107 | #define RR2_MAXIMUM_SLICE 500000 /*+ Maximum Timeslice +*/ |
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108 | |||
109 | #define RR2_MAIN_YES 1 /*+ The level creates the main +*/ |
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110 | #define RR2_MAIN_NO 0 /*+ The level does'nt create the main +*/ |
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111 | |||
112 | /*+ Registration function: |
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113 | TIME slice the slice for the Round Robin queue |
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114 | int createmain 1 if the level creates the main task 0 otherwise |
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115 | struct multiboot_info *b used if createmain specified |
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116 | |||
117 | returns the level number at which the module has been registered. |
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118 | +*/ |
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119 | LEVEL RR2_register_level(TIME slice, |
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120 | int createmain, |
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121 | struct multiboot_info *mb); |
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122 | |||
123 | __END_DECLS |
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124 | #endif |