1 | /** |
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2 | * @file rtems/rtems/ratemon.h |
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3 | * |
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4 | * @defgroup ClassicRateMon Rate Monotonic Scheduler |
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5 | * |
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6 | * @ingroup ClassicRTEMS |
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7 | * @brief Classic API Rate Monotonic Manager. |
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8 | * |
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9 | * This include file contains all the constants, structures, and |
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10 | * prototypes associated with the Rate Monotonic Manager. This manager |
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11 | * provides facilities to implement threads which execute in a periodic |
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12 | * fashion. |
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13 | * |
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14 | * Directives provided are: |
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15 | * |
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16 | * - create a rate monotonic timer |
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17 | * - cancel a period |
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18 | * - delete a rate monotonic timer |
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19 | * - conclude current and start the next period |
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20 | * - obtain status information on a period |
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21 | * - obtain the number of postponed jobs |
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22 | */ |
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23 | |
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24 | /* COPYRIGHT (c) 1989-2009, 2016. |
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25 | * On-Line Applications Research Corporation (OAR). |
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26 | * COPYRIGHT (c) 2016-2017 Kuan-Hsun Chen. |
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27 | * |
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28 | * The license and distribution terms for this file may be |
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29 | * found in the file LICENSE in this distribution or at |
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30 | * http://www.rtems.org/license/LICENSE. |
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31 | */ |
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32 | |
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33 | #ifndef _RTEMS_RTEMS_RATEMON_H |
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34 | #define _RTEMS_RTEMS_RATEMON_H |
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35 | |
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36 | #include <rtems/rtems/types.h> |
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37 | #include <rtems/rtems/status.h> |
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38 | #include <rtems/score/thread.h> |
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39 | #include <rtems/score/watchdog.h> |
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40 | |
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41 | struct rtems_printer; |
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42 | |
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43 | #ifdef __cplusplus |
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44 | extern "C" { |
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45 | #endif |
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46 | |
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47 | /** |
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48 | * @defgroup ClassicRateMon Rate Monotonic Scheduler |
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49 | * |
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50 | * @ingroup ClassicRTEMS |
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51 | * |
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52 | * This encapsulates functionality related to the Classic API Rate |
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53 | * Monotonic Manager. |
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54 | * |
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55 | * Statistics are kept for each period and can be obtained or printed via |
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56 | * API calls. The statistics kept include minimum, maximum and average times |
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57 | * for both cpu usage and wall time. The statistics indicate the execution |
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58 | * and wall time used by the owning thread between successive calls to |
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59 | * rtems_rate_monotonic_period. |
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60 | */ |
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61 | /**@{*/ |
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62 | |
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63 | /** |
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64 | * This is the public type used for the rate monotonic timing |
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65 | * statistics. |
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66 | */ |
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67 | #include <rtems/score/timespec.h> |
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68 | |
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69 | typedef struct timespec rtems_rate_monotonic_period_time_t RTEMS_DEPRECATED; |
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70 | |
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71 | /** |
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72 | * This is the internal type used for the rate monotonic timing |
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73 | * statistics. |
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74 | */ |
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75 | #include <rtems/score/timestamp.h> |
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76 | |
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77 | /** |
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78 | * The following enumerated type defines the states in which a |
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79 | * period may be. |
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80 | */ |
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81 | typedef enum { |
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82 | /** |
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83 | * This value indicates the period is off the watchdog chain, |
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84 | * and has never been initialized. |
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85 | */ |
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86 | RATE_MONOTONIC_INACTIVE, |
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87 | |
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88 | /** |
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89 | * This value indicates the period is on the watchdog chain, and |
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90 | * running. The owner should be executed or blocked waiting on |
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91 | * another object. |
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92 | */ |
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93 | RATE_MONOTONIC_ACTIVE, |
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94 | |
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95 | /** |
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96 | * This value indicates the period is off the watchdog chain, and |
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97 | * has expired. The owner is still executing and has taken too much |
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98 | * all time to complete this iteration of the period. |
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99 | */ |
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100 | RATE_MONOTONIC_EXPIRED |
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101 | } rtems_rate_monotonic_period_states; |
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102 | |
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103 | /** |
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104 | * The following constant is the interval passed to the rate_monontonic_period |
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105 | * directive to obtain status information. |
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106 | */ |
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107 | #define RTEMS_PERIOD_STATUS WATCHDOG_NO_TIMEOUT |
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108 | |
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109 | /** |
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110 | * The following defines the PUBLIC data structure that has the |
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111 | * statistics kept on each period instance. |
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112 | * |
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113 | * @note The public structure uses struct timespec while the |
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114 | * internal one uses Timestamp_Control. |
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115 | */ |
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116 | typedef struct { |
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117 | /** This field contains the number of periods executed. */ |
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118 | uint32_t count; |
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119 | /** This field contains the number of periods missed. */ |
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120 | uint32_t missed_count; |
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121 | |
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122 | /** This field contains the least amount of CPU time used in a period. */ |
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123 | struct timespec min_cpu_time; |
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124 | /** This field contains the highest amount of CPU time used in a period. */ |
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125 | struct timespec max_cpu_time; |
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126 | /** This field contains the total amount of wall time used in a period. */ |
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127 | struct timespec total_cpu_time; |
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128 | |
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129 | /** This field contains the least amount of wall time used in a period. */ |
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130 | struct timespec min_wall_time; |
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131 | /** This field contains the highest amount of wall time used in a period. */ |
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132 | struct timespec max_wall_time; |
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133 | /** This field contains the total amount of CPU time used in a period. */ |
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134 | struct timespec total_wall_time; |
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135 | } rtems_rate_monotonic_period_statistics; |
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136 | |
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137 | /** |
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138 | * The following defines the INTERNAL data structure that has the |
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139 | * statistics kept on each period instance. |
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140 | */ |
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141 | typedef struct { |
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142 | /** This field contains the number of periods executed. */ |
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143 | uint32_t count; |
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144 | /** This field contains the number of periods missed. */ |
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145 | uint32_t missed_count; |
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146 | |
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147 | /** This field contains the least amount of CPU time used in a period. */ |
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148 | Timestamp_Control min_cpu_time; |
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149 | /** This field contains the highest amount of CPU time used in a period. */ |
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150 | Timestamp_Control max_cpu_time; |
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151 | /** This field contains the total amount of wall time used in a period. */ |
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152 | Timestamp_Control total_cpu_time; |
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153 | |
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154 | /** This field contains the least amount of wall time used in a period. */ |
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155 | Timestamp_Control min_wall_time; |
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156 | /** This field contains the highest amount of wall time used in a period. */ |
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157 | Timestamp_Control max_wall_time; |
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158 | /** This field contains the total amount of CPU time used in a period. */ |
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159 | Timestamp_Control total_wall_time; |
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160 | } Rate_monotonic_Statistics; |
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161 | |
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162 | /** |
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163 | * The following defines the period status structure. |
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164 | */ |
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165 | typedef struct { |
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166 | /** This is the Id of the thread using this period. */ |
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167 | rtems_id owner; |
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168 | |
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169 | /** This is the current state of this period. */ |
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170 | rtems_rate_monotonic_period_states state; |
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171 | |
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172 | /** |
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173 | * This is the length of wall time that has passed since this period |
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174 | * was last initiated. If the period is expired or has not been initiated, |
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175 | * then this field has no meaning. |
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176 | */ |
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177 | struct timespec since_last_period; |
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178 | |
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179 | /** |
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180 | * This is the amount of CPU time that has been used since this period |
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181 | * was last initiated. If the period is expired or has not been initiated, |
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182 | * then this field has no meaning. |
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183 | */ |
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184 | struct timespec executed_since_last_period; |
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185 | |
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186 | /** This is the count of postponed jobs of this period. */ |
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187 | uint32_t postponed_jobs_count; |
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188 | } rtems_rate_monotonic_period_status; |
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189 | |
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190 | /** |
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191 | * @brief The following structure defines the control block used to manage each |
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192 | * period. |
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193 | * |
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194 | * State changes are protected by the default thread lock of the owner thread. |
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195 | * The owner thread is the thread that created the period object. The owner |
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196 | * thread field is immutable after object creation. |
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197 | */ |
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198 | typedef struct { |
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199 | /** This field is the object management portion of a Period instance. */ |
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200 | Objects_Control Object; |
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201 | |
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202 | /** |
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203 | * @brief Protects the rate monotonic period state. |
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204 | */ |
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205 | ISR_LOCK_MEMBER( Lock ) |
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206 | |
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207 | /** This is the timer used to provide the unblocking mechanism. */ |
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208 | Watchdog_Control Timer; |
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209 | |
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210 | /** This field indicates the current state of the period. */ |
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211 | rtems_rate_monotonic_period_states state; |
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212 | |
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213 | /** |
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214 | * @brief A priority node for use by the scheduler job release and cancel |
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215 | * operations. |
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216 | */ |
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217 | Priority_Node Priority; |
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218 | |
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219 | /** |
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220 | * This field contains the length of the next period to be |
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221 | * executed. |
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222 | */ |
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223 | uint32_t next_length; |
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224 | |
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225 | /** |
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226 | * This field contains a pointer to the TCB for the thread |
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227 | * which owns and uses this period instance. |
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228 | */ |
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229 | Thread_Control *owner; |
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230 | |
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231 | /** |
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232 | * This field contains the cpu usage value of the owning thread when |
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233 | * the period was initiated. It is used to compute the period's |
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234 | * statistics. |
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235 | */ |
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236 | Timestamp_Control cpu_usage_period_initiated; |
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237 | |
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238 | /** |
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239 | * This field contains the wall time value when the period |
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240 | * was initiated. It is used to compute the period's statistics. |
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241 | */ |
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242 | Timestamp_Control time_period_initiated; |
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243 | |
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244 | /** |
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245 | * This field contains the statistics maintained for the period. |
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246 | */ |
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247 | Rate_monotonic_Statistics Statistics; |
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248 | |
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249 | /** |
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250 | * This field contains the number of postponed jobs. |
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251 | * When the watchdog timeout, this variable will be increased immediately. |
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252 | */ |
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253 | uint32_t postponed_jobs; |
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254 | |
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255 | /** |
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256 | * This field contains the tick of the latest deadline decided by the period |
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257 | * watchdog. |
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258 | */ |
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259 | uint64_t latest_deadline; |
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260 | } Rate_monotonic_Control; |
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261 | |
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262 | /** |
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263 | * @brief Create a Period |
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264 | * |
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265 | * Rate Monotonic Manager |
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266 | * |
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267 | * This routine implements the rate_monotonic_create directive. The |
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268 | * period will have the name name. It returns the id of the |
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269 | * created period in ID. |
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270 | */ |
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271 | rtems_status_code rtems_rate_monotonic_create( |
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272 | rtems_name name, |
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273 | rtems_id *id |
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274 | ); |
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275 | |
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276 | /** |
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277 | * @brief RTEMS Rate Monotonic Name to Id |
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278 | * |
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279 | * This routine implements the rtems_rate_monotonic_ident directive. |
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280 | * It returns the period ID associated with name. If more than one period |
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281 | * is named name, then the period to which the ID belongs is arbitrary. |
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282 | * |
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283 | * @param[in] name is the user defined period name |
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284 | * @param[in] id is the pointer to period id |
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285 | * |
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286 | * @retval This method returns RTEMS_SUCCESSFUL if there was not an |
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287 | * error. Otherwise, a status code is returned indicating the |
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288 | * source of the error. If successful, the id will |
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289 | * be filled in with the region id. |
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290 | */ |
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291 | rtems_status_code rtems_rate_monotonic_ident( |
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292 | rtems_name name, |
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293 | rtems_id *id |
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294 | ); |
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295 | |
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296 | /** |
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297 | * @brief RTEMS Rate Monotonic Cancel |
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298 | * |
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299 | * This routine implements the rtems_rate_monotonic_cancel directive. This |
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300 | * directive stops the period associated with ID from continuing to |
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301 | * run. |
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302 | * |
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303 | * @param[in] id is the rate monotonic id |
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304 | * |
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305 | * @retval RTEMS_SUCCESSFUL if successful and caller is not the owning thread |
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306 | * or error code if unsuccessful |
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307 | * |
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308 | */ |
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309 | rtems_status_code rtems_rate_monotonic_cancel( |
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310 | rtems_id id |
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311 | ); |
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312 | |
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313 | /** |
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314 | * @brief RTEMS Delete Rate Monotonic |
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315 | * |
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316 | * This routine implements the rtems_rate_monotonic_delete directive. The |
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317 | * period indicated by ID is deleted. |
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318 | * |
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319 | * @param[in] id is the rate monotonic id |
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320 | * |
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321 | * @retval This method returns RTEMS_SUCCESSFUL if there was not an |
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322 | * error. Otherwise, a status code is returned indicating the |
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323 | * source of the error. |
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324 | */ |
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325 | rtems_status_code rtems_rate_monotonic_delete( |
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326 | rtems_id id |
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327 | ); |
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328 | |
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329 | /** |
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330 | * @brief RTEMS Rate Monotonic Get Status |
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331 | * |
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332 | * This routine implements the rtems_rate_monotonic_get_status directive. |
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333 | * Information about the period indicated by ID is returned. |
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334 | * |
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335 | * @param[in] id is the rate monotonic id |
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336 | * @param[in] status is the pointer to status control block |
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337 | * |
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338 | * @retval This method returns RTEMS_SUCCESSFUL if there was not an |
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339 | * error. Otherwise, a status code is returned indicating the |
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340 | * source of the error. |
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341 | * |
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342 | */ |
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343 | rtems_status_code rtems_rate_monotonic_get_status( |
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344 | rtems_id id, |
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345 | rtems_rate_monotonic_period_status *status |
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346 | ); |
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347 | |
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348 | /** |
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349 | * @brief RTEMS Rate Monotonic Get Statistics |
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350 | * |
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351 | * This routine implements the rtems_rate_monotonic_get_statistics directive. |
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352 | * Statistics gathered from the use of this period are returned. |
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353 | * |
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354 | * @param[in] id is the rate monotonic id |
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355 | * @param[in] statistics is the pointer to statistics control block |
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356 | * |
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357 | * @retval RTEMS_SUCCESSFUL if successful or error code if unsuccessful |
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358 | */ |
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359 | rtems_status_code rtems_rate_monotonic_get_statistics( |
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360 | rtems_id id, |
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361 | rtems_rate_monotonic_period_statistics *statistics |
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362 | ); |
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363 | |
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364 | /** |
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365 | * @brief RTEMS Rate Monotonic Reset Statistics |
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366 | * |
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367 | * Rate Monotonic Manager -- Reset Statistics |
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368 | * |
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369 | * This routine allows a thread to reset the statistics information |
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370 | * on a specific period instance. |
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371 | */ |
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372 | rtems_status_code rtems_rate_monotonic_reset_statistics( |
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373 | rtems_id id |
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374 | ); |
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375 | |
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376 | /** |
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377 | * @brief rtems_rate_monotonic_reset_all_statistics |
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378 | * |
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379 | * This routine allows a thread to reset the statistics information |
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380 | * on ALL period instances. |
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381 | */ |
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382 | void rtems_rate_monotonic_reset_all_statistics( void ); |
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383 | |
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384 | /** |
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385 | * @brief RTEMS Report Rate Monotonic Statistics |
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386 | * |
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387 | * This routine allows a thread to print the statistics information |
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388 | * on ALL period instances which have non-zero counts using the RTEMS |
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389 | * printer. The implementation of this directive straddles the fence |
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390 | * between inside and outside of RTEMS. It is presented as part of |
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391 | * the Manager but actually uses other services of the Manager. |
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392 | */ |
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393 | void rtems_rate_monotonic_report_statistics_with_plugin( |
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394 | const struct rtems_printer *printer |
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395 | ); |
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396 | |
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397 | /** |
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398 | * @brief RTEMS Report Rate Monotonic Statistics |
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399 | * |
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400 | * This routine allows a thread to print the statistics information |
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401 | * on ALL period instances which have non-zero counts using printk. |
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402 | */ |
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403 | void rtems_rate_monotonic_report_statistics( void ); |
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404 | |
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405 | /** |
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406 | * @brief RTEMS Rate Monotonic Period |
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407 | * |
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408 | * This routine implements the rtems_rate_monotonic_period directive. When |
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409 | * length is non-zero, this directive initiates the period associated with |
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410 | * ID from continuing for a period of length. If length is zero, then |
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411 | * result is set to indicate the current state of the period. |
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412 | * |
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413 | * @param[in] id is the rate monotonic id |
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414 | * @param[in] length is the length of period (in ticks) |
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415 | * |
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416 | * @retval RTEMS_SUCCESSFUL if successful or error code if unsuccessful |
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417 | */ |
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418 | rtems_status_code rtems_rate_monotonic_period( |
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419 | rtems_id id, |
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420 | rtems_interval length |
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421 | ); |
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422 | |
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423 | /**@}*/ |
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424 | |
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425 | #ifdef __cplusplus |
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426 | } |
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427 | #endif |
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428 | |
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429 | #endif |
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430 | /* end of include file */ |
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