1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Rate Monotonic Support |
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5 | * @ingroup ClassicRateMon |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2010. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/rtems/ratemonimpl.h> |
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22 | #include <rtems/score/schedulerimpl.h> |
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23 | #include <rtems/score/threadimpl.h> |
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24 | #include <rtems/score/todimpl.h> |
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25 | #include <rtems/score/watchdogimpl.h> |
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26 | |
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27 | bool _Rate_monotonic_Get_status( |
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28 | Rate_monotonic_Control *the_period, |
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29 | Rate_monotonic_Period_time_t *wall_since_last_period, |
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30 | Timestamp_Control *cpu_since_last_period |
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31 | ) |
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32 | { |
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33 | Timestamp_Control uptime; |
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34 | Thread_Control *owning_thread = the_period->owner; |
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35 | Timestamp_Control used; |
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36 | |
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37 | /* |
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38 | * Determine elapsed wall time since period initiated. |
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39 | */ |
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40 | _TOD_Get_uptime( &uptime ); |
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41 | _Timestamp_Subtract( |
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42 | &the_period->time_period_initiated, &uptime, wall_since_last_period |
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43 | ); |
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44 | |
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45 | /* |
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46 | * Determine cpu usage since period initiated. |
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47 | */ |
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48 | _Thread_Get_CPU_time_used( owning_thread, &used ); |
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49 | |
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50 | /* |
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51 | * The cpu usage info was reset while executing. Can't |
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52 | * determine a status. |
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53 | */ |
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54 | if ( _Timestamp_Less_than( &used, &the_period->cpu_usage_period_initiated ) ) |
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55 | return false; |
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56 | |
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57 | /* used = current cpu usage - cpu usage at start of period */ |
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58 | _Timestamp_Subtract( |
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59 | &the_period->cpu_usage_period_initiated, |
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60 | &used, |
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61 | cpu_since_last_period |
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62 | ); |
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63 | |
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64 | return true; |
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65 | } |
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66 | |
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67 | void _Rate_monotonic_Restart( Rate_monotonic_Control *the_period ) |
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68 | { |
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69 | ISR_Level level; |
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70 | |
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71 | /* |
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72 | * Set the starting point and the CPU time used for the statistics. |
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73 | */ |
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74 | _TOD_Get_uptime( &the_period->time_period_initiated ); |
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75 | _Thread_Get_CPU_time_used( |
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76 | the_period->owner, |
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77 | &the_period->cpu_usage_period_initiated |
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78 | ); |
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79 | |
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80 | _Scheduler_Release_job( the_period->owner, the_period->next_length ); |
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81 | |
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82 | _ISR_Disable( level ); |
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83 | _Watchdog_Per_CPU_insert_relative( |
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84 | &the_period->Timer, |
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85 | _Per_CPU_Get(), |
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86 | the_period->next_length |
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87 | ); |
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88 | _ISR_Enable( level ); |
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89 | } |
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90 | |
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91 | static void _Rate_monotonic_Update_statistics( |
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92 | Rate_monotonic_Control *the_period |
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93 | ) |
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94 | { |
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95 | Timestamp_Control executed; |
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96 | Rate_monotonic_Period_time_t since_last_period; |
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97 | Rate_monotonic_Statistics *stats; |
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98 | bool valid_status; |
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99 | |
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100 | /* |
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101 | * Assume we are only called in states where it is appropriate |
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102 | * to update the statistics. This should only be RATE_MONOTONIC_ACTIVE |
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103 | * and RATE_MONOTONIC_EXPIRED. |
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104 | */ |
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105 | |
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106 | /* |
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107 | * Update the counts. |
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108 | */ |
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109 | stats = &the_period->Statistics; |
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110 | stats->count++; |
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111 | |
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112 | if ( the_period->state == RATE_MONOTONIC_EXPIRED ) |
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113 | stats->missed_count++; |
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114 | |
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115 | /* |
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116 | * Grab status for time statistics. |
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117 | */ |
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118 | valid_status = |
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119 | _Rate_monotonic_Get_status( the_period, &since_last_period, &executed ); |
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120 | if (!valid_status) |
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121 | return; |
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122 | |
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123 | /* |
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124 | * Update CPU time |
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125 | */ |
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126 | #ifndef __RTEMS_USE_TICKS_FOR_STATISTICS__ |
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127 | _Timestamp_Add_to( &stats->total_cpu_time, &executed ); |
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128 | |
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129 | if ( _Timestamp_Less_than( &executed, &stats->min_cpu_time ) ) |
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130 | stats->min_cpu_time = executed; |
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131 | |
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132 | if ( _Timestamp_Greater_than( &executed, &stats->max_cpu_time ) ) |
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133 | stats->max_cpu_time = executed; |
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134 | #else |
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135 | stats->total_cpu_time += executed; |
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136 | |
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137 | if ( executed < stats->min_cpu_time ) |
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138 | stats->min_cpu_time = executed; |
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139 | |
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140 | if ( executed > stats->max_cpu_time ) |
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141 | stats->max_cpu_time = executed; |
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142 | #endif |
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143 | |
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144 | /* |
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145 | * Update Wall time |
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146 | */ |
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147 | #ifndef __RTEMS_USE_TICKS_FOR_STATISTICS__ |
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148 | _Timestamp_Add_to( &stats->total_wall_time, &since_last_period ); |
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149 | |
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150 | if ( _Timestamp_Less_than( &since_last_period, &stats->min_wall_time ) ) |
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151 | stats->min_wall_time = since_last_period; |
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152 | |
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153 | if ( _Timestamp_Greater_than( &since_last_period, &stats->max_wall_time ) ) |
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154 | stats->max_wall_time = since_last_period; |
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155 | #else |
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156 | |
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157 | /* Sanity check wall time */ |
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158 | if ( since_last_period < executed ) |
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159 | since_last_period = executed; |
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160 | |
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161 | stats->total_wall_time += since_last_period; |
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162 | |
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163 | if ( since_last_period < stats->min_wall_time ) |
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164 | stats->min_wall_time = since_last_period; |
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165 | |
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166 | if ( since_last_period > stats->max_wall_time ) |
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167 | stats->max_wall_time = since_last_period; |
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168 | #endif |
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169 | } |
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170 | |
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171 | rtems_status_code rtems_rate_monotonic_period( |
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172 | rtems_id id, |
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173 | rtems_interval length |
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174 | ) |
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175 | { |
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176 | Rate_monotonic_Control *the_period; |
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177 | Objects_Locations location; |
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178 | rtems_status_code return_value; |
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179 | rtems_rate_monotonic_period_states local_state; |
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180 | ISR_Level level; |
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181 | |
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182 | the_period = _Rate_monotonic_Get( id, &location ); |
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183 | |
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184 | switch ( location ) { |
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185 | case OBJECTS_LOCAL: |
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186 | if ( !_Thread_Is_executing( the_period->owner ) ) { |
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187 | _Objects_Put( &the_period->Object ); |
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188 | return RTEMS_NOT_OWNER_OF_RESOURCE; |
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189 | } |
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190 | |
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191 | if ( length == RTEMS_PERIOD_STATUS ) { |
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192 | switch ( the_period->state ) { |
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193 | case RATE_MONOTONIC_INACTIVE: |
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194 | return_value = RTEMS_NOT_DEFINED; |
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195 | break; |
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196 | case RATE_MONOTONIC_EXPIRED: |
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197 | case RATE_MONOTONIC_EXPIRED_WHILE_BLOCKING: |
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198 | return_value = RTEMS_TIMEOUT; |
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199 | break; |
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200 | case RATE_MONOTONIC_ACTIVE: |
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201 | default: /* unreached -- only to remove warnings */ |
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202 | return_value = RTEMS_SUCCESSFUL; |
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203 | break; |
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204 | } |
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205 | _Objects_Put( &the_period->Object ); |
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206 | return( return_value ); |
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207 | } |
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208 | |
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209 | _ISR_Disable( level ); |
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210 | if ( the_period->state == RATE_MONOTONIC_INACTIVE ) { |
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211 | _ISR_Enable( level ); |
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212 | |
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213 | the_period->state = RATE_MONOTONIC_ACTIVE; |
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214 | the_period->next_length = length; |
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215 | _Rate_monotonic_Restart( the_period ); |
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216 | _Objects_Put( &the_period->Object ); |
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217 | return RTEMS_SUCCESSFUL; |
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218 | } |
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219 | |
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220 | if ( the_period->state == RATE_MONOTONIC_ACTIVE ) { |
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221 | /* |
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222 | * Update statistics from the concluding period. |
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223 | */ |
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224 | _Rate_monotonic_Update_statistics( the_period ); |
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225 | |
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226 | /* |
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227 | * This tells the _Rate_monotonic_Timeout that this task is |
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228 | * in the process of blocking on the period and that we |
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229 | * may be changing the length of the next period. |
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230 | */ |
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231 | the_period->state = RATE_MONOTONIC_OWNER_IS_BLOCKING; |
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232 | the_period->next_length = length; |
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233 | |
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234 | _ISR_Enable( level ); |
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235 | |
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236 | _Thread_Executing->Wait.id = the_period->Object.id; |
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237 | _Thread_Set_state( _Thread_Executing, STATES_WAITING_FOR_PERIOD ); |
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238 | |
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239 | /* |
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240 | * Did the watchdog timer expire while we were actually blocking |
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241 | * on it? |
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242 | */ |
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243 | _ISR_Disable( level ); |
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244 | local_state = the_period->state; |
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245 | the_period->state = RATE_MONOTONIC_ACTIVE; |
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246 | _ISR_Enable( level ); |
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247 | |
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248 | /* |
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249 | * If it did, then we want to unblock ourself and continue as |
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250 | * if nothing happen. The period was reset in the timeout routine. |
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251 | */ |
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252 | if ( local_state == RATE_MONOTONIC_EXPIRED_WHILE_BLOCKING ) |
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253 | _Thread_Clear_state( _Thread_Executing, STATES_WAITING_FOR_PERIOD ); |
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254 | |
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255 | _Objects_Put( &the_period->Object ); |
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256 | return RTEMS_SUCCESSFUL; |
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257 | } |
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258 | |
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259 | if ( the_period->state == RATE_MONOTONIC_EXPIRED ) { |
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260 | /* |
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261 | * Update statistics from the concluding period |
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262 | */ |
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263 | _Rate_monotonic_Update_statistics( the_period ); |
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264 | |
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265 | _ISR_Enable( level ); |
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266 | |
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267 | the_period->state = RATE_MONOTONIC_ACTIVE; |
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268 | the_period->next_length = length; |
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269 | |
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270 | _Watchdog_Per_CPU_insert_relative( |
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271 | &the_period->Timer, |
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272 | _Per_CPU_Get(), |
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273 | length |
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274 | ); |
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275 | _Scheduler_Release_job( the_period->owner, the_period->next_length ); |
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276 | _Objects_Put( &the_period->Object ); |
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277 | return RTEMS_TIMEOUT; |
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278 | } |
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279 | |
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280 | /* |
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281 | * These should never happen so just return invalid Id. |
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282 | * - RATE_MONOTONIC_OWNER_IS_BLOCKING: |
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283 | * - RATE_MONOTONIC_EXPIRED_WHILE_BLOCKING: |
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284 | */ |
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285 | #if defined(RTEMS_MULTIPROCESSING) |
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286 | case OBJECTS_REMOTE: /* should never return this */ |
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287 | #endif |
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288 | case OBJECTS_ERROR: |
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289 | break; |
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290 | } |
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291 | |
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292 | return RTEMS_INVALID_ID; |
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293 | } |
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