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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: ps.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 PS (Polling Server) |
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32 | |||
33 | Title: |
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34 | PS (Polling 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 Polling 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 __PS_H__ |
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90 | #define __PS_H__ |
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91 | |||
92 | #include <ll/ll.h> |
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93 | #include <kernel/config.h> |
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94 | #include <sys/types.h> |
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95 | #include <kernel/types.h> |
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96 | #include <modules/codes.h> |
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97 | |||
98 | /*+ 1 - ln(2) +*/ |
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99 | #ifndef RM_MINFREEBANDWIDTH |
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100 | #define RM_MINFREEBANDWIDTH 1317922825 |
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101 | #endif |
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102 | |||
103 | /*+ flags... +*/ |
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104 | #define PS_DISABLE_ALL 0 |
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105 | #define PS_ENABLE_BACKGROUND 1 /*+ Background scheduling enabled +*/ |
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106 | #define PS_ENABLE_GUARANTEE_EDF 2 /*+ Task Guarantee enabled +*/ |
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107 | #define PS_ENABLE_ALL_EDF 3 /*+ All flags enabled +*/ |
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108 | |||
109 | #define PS_ENABLE_GUARANTEE_RM 4 /*+ Task Guarantee enabled +*/ |
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110 | #define PS_ENABLE_ALL_RM 5 /*+ All flags enabled +*/ |
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111 | |||
112 | /*+ internal flags +*/ |
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113 | #define PS_BACKGROUND 8 /*+ this flag is set when scheduling |
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114 | in background +*/ |
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115 | #define PS_BACKGROUND_BLOCK 16 /*+ this flag is set when we want to |
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116 | blocks the background scheduling +*/ |
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117 | |||
118 | /*+ Registration function: |
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119 | bandwidth_t b Max bandwidth used by the TBS |
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120 | int flags Options to be used in this level instance... |
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121 | LEVEL master the level that must be used as master level for the |
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122 | TBS tasks |
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123 | int num,den used to compute the TBS bandwidth +*/ |
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124 | void PS_register_level(int flags, LEVEL master, int Cs, int per); |
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125 | |||
126 | /*+ Returns the used bandwidth of a level +*/ |
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127 | bandwidth_t PS_usedbandwidth(LEVEL l); |
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128 | |||
129 | #endif |