1 | /* ratemon.h |
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2 | * |
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3 | * This include file contains all the constants, structures, and |
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4 | * prototypes associated with the Rate Monotonic Manager. This manager |
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5 | * provides facilities to implement tasks which execute in a periodic fashion. |
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6 | * |
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7 | * Directives provided are: |
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8 | * |
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9 | * + create a rate monotonic timer |
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10 | * + cancel a period |
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11 | * + delete a rate monotonic timer |
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12 | * + conclude current and start the next period |
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13 | * |
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14 | * COPYRIGHT (c) 1989-1997. |
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15 | * On-Line Applications Research Corporation (OAR). |
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16 | * Copyright assigned to U.S. Government, 1994. |
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17 | * |
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18 | * The license and distribution terms for this file may in |
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19 | * the file LICENSE in this distribution or at |
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20 | * http://www.OARcorp.com/rtems/license.html. |
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21 | * |
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22 | * $Id$ |
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23 | */ |
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24 | |
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25 | #ifndef __RTEMS_RATE_MONOTONIC_h |
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26 | #define __RTEMS_RATE_MONOTONIC_h |
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27 | |
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28 | #ifdef __cplusplus |
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29 | extern "C" { |
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30 | #endif |
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31 | |
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32 | #include <rtems/score/object.h> |
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33 | #include <rtems/score/thread.h> |
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34 | #include <rtems/score/watchdog.h> |
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35 | |
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36 | /* |
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37 | * The following enumerated type defines the states in which a |
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38 | * period may be. |
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39 | */ |
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40 | |
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41 | typedef enum { |
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42 | RATE_MONOTONIC_INACTIVE, /* off chain, never initialized */ |
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43 | RATE_MONOTONIC_OWNER_IS_BLOCKING, /* on chain, owner is blocking on it */ |
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44 | RATE_MONOTONIC_ACTIVE, /* on chain, running continuously */ |
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45 | RATE_MONOTONIC_EXPIRED_WHILE_BLOCKING, /* on chain, expired while owner was */ |
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46 | /* was blocking on it */ |
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47 | RATE_MONOTONIC_EXPIRED /* off chain, will be reset by next */ |
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48 | /* rtems_rate_monotonic_period */ |
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49 | } rtems_rate_monotonic_period_states; |
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50 | |
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51 | /* |
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52 | * The following constant is the interval passed to the rate_monontonic_period |
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53 | * directive to obtain status information. |
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54 | */ |
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55 | |
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56 | #define RTEMS_PERIOD_STATUS WATCHDOG_NO_TIMEOUT |
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57 | |
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58 | /* |
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59 | * The following defines the period status structure. |
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60 | */ |
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61 | |
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62 | typedef struct { |
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63 | rtems_rate_monotonic_period_states state; |
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64 | unsigned32 ticks_since_last_period; |
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65 | unsigned32 ticks_executed_since_last_period; |
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66 | } rtems_rate_monotonic_period_status; |
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67 | |
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68 | /* |
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69 | * The following structure defines the control block used to manage |
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70 | * each period. |
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71 | */ |
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72 | |
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73 | typedef struct { |
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74 | Objects_Control Object; |
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75 | Watchdog_Control Timer; |
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76 | rtems_rate_monotonic_period_states state; |
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77 | unsigned32 owner_ticks_executed_at_period; |
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78 | unsigned32 time_at_period; |
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79 | Thread_Control *owner; |
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80 | } Rate_monotonic_Control; |
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81 | |
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82 | RTEMS_EXTERN Objects_Information _Rate_monotonic_Information; |
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83 | |
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84 | /* |
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85 | * _Rate_monotonic_Manager_initialization |
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86 | * |
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87 | * DESCRIPTION: |
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88 | * |
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89 | * This routine performs the initialization necessary for this manager. |
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90 | */ |
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91 | |
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92 | void _Rate_monotonic_Manager_initialization( |
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93 | unsigned32 maximum_periods |
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94 | ); |
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95 | |
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96 | /* |
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97 | * rtems_rate_monotonic_create |
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98 | * |
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99 | * DESCRIPTION: |
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100 | * |
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101 | * This routine implements the rate_monotonic_create directive. The |
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102 | * period will have the name name. It returns the id of the |
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103 | * created period in ID. |
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104 | */ |
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105 | |
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106 | rtems_status_code rtems_rate_monotonic_create( |
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107 | rtems_name name, |
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108 | Objects_Id *id |
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109 | ); |
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110 | |
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111 | /* |
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112 | * rtems_rate_monotonic_ident |
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113 | * |
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114 | * DESCRIPTION: |
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115 | * |
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116 | * This routine implements the rtems_rate_monotonic_ident directive. |
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117 | * This directive returns the period ID associated with name. |
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118 | * If more than one period is named name, then the period |
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119 | * to which the ID belongs is arbitrary. |
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120 | */ |
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121 | |
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122 | rtems_status_code rtems_rate_monotonic_ident( |
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123 | rtems_name name, |
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124 | Objects_Id *id |
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125 | ); |
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126 | |
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127 | /* |
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128 | * rtems_rate_monotonic_cancel |
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129 | * |
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130 | * DESCRIPTION: |
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131 | * |
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132 | * This routine implements the rtems_rate_monotonic_cancel directive. This |
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133 | * directive stops the period associated with ID from continuing to |
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134 | * run. |
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135 | */ |
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136 | |
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137 | rtems_status_code rtems_rate_monotonic_cancel( |
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138 | Objects_Id id |
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139 | ); |
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140 | |
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141 | /* |
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142 | * rtems_rate_monotonic_delete |
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143 | * |
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144 | * DESCRIPTION: |
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145 | * |
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146 | * This routine implements the rtems_rate_monotonic_delete directive. The |
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147 | * period indicated by ID is deleted. |
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148 | */ |
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149 | |
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150 | rtems_status_code rtems_rate_monotonic_delete( |
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151 | Objects_Id id |
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152 | ); |
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153 | |
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154 | /* |
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155 | * rtems_rate_monotonic_get_status |
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156 | * |
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157 | * DESCRIPTION: |
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158 | * |
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159 | * This routine implements the rtems_rate_monotonic_get_status directive. |
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160 | * Information about the period indicated by ID is returned. |
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161 | * |
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162 | */ |
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163 | |
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164 | rtems_status_code rtems_rate_monotonic_get_status( |
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165 | Objects_Id id, |
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166 | rtems_rate_monotonic_period_status *status |
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167 | ); |
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168 | |
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169 | /* |
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170 | * rtems_rate_monotonic_period |
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171 | * |
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172 | * DESCRIPTION: |
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173 | * |
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174 | * This routine implements the rtems_rate_monotonic_period directive. When |
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175 | * length is non-zero, this directive initiates the period associated with |
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176 | * ID from continuing for a period of length. If length is zero, then |
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177 | * result is set to indicate the current state of the period. |
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178 | */ |
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179 | |
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180 | rtems_status_code rtems_rate_monotonic_period( |
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181 | Objects_Id id, |
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182 | rtems_interval length |
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183 | ); |
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184 | |
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185 | /* |
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186 | * _Rate_monotonic_Timeout |
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187 | * |
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188 | * DESCRIPTION: |
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189 | * |
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190 | * This routine is invoked when the period represented |
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191 | * by ID expires. If the task which owns this period is blocked |
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192 | * waiting for the period to expire, then it is readied and the |
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193 | * period is restarted. If the owning task is not waiting for the |
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194 | * period to expire, then the period is placed in the EXPIRED |
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195 | * state and not restarted. |
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196 | */ |
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197 | |
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198 | void _Rate_monotonic_Timeout ( |
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199 | Objects_Id id, |
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200 | void *ignored |
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201 | ); |
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202 | |
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203 | #ifndef __RTEMS_APPLICATION__ |
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204 | #include <rtems/rtems/ratemon.inl> |
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205 | #endif |
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206 | |
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207 | #ifdef __cplusplus |
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208 | } |
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209 | #endif |
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210 | |
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211 | #endif |
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212 | /* end of include file */ |
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