1 | /** |
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2 | * @file rtems/score/schedulerpriority.h |
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3 | * |
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4 | * This include file contains all the constants and structures associated |
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5 | * with the manipulation of threads for the priority-based scheduler. |
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6 | */ |
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7 | |
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8 | /* |
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9 | * Copryight (c) 2010 Gedare Bloom. |
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10 | * Copyright (C) 2011 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.com/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #ifndef _RTEMS_SCORE_SCHEDULERPRIORITY_H |
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18 | #define _RTEMS_SCORE_SCHEDULERPRIORITY_H |
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19 | |
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20 | #include <rtems/score/chain.h> |
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21 | #include <rtems/score/priority.h> |
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22 | #include <rtems/score/scheduler.h> |
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23 | |
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24 | #ifdef __cplusplus |
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25 | extern "C" { |
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26 | #endif |
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27 | |
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28 | /** |
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29 | * @addtogroup ScoreScheduler |
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30 | * |
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31 | */ |
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32 | /**@{*/ |
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33 | |
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34 | /** |
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35 | * Entry points for the Deterministic Priority Based Scheduler. |
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36 | */ |
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37 | #define SCHEDULER_PRIORITY_ENTRY_POINTS \ |
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38 | { \ |
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39 | _Scheduler_priority_Initialize, /* initialize entry point */ \ |
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40 | _Scheduler_priority_Schedule, /* schedule entry point */ \ |
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41 | _Scheduler_priority_Yield, /* yield entry point */ \ |
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42 | _Scheduler_priority_Block, /* block entry point */ \ |
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43 | _Scheduler_priority_Unblock, /* unblock entry point */ \ |
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44 | _Scheduler_priority_Allocate, /* allocate entry point */ \ |
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45 | _Scheduler_priority_Free, /* free entry point */ \ |
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46 | _Scheduler_priority_Update, /* update entry point */ \ |
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47 | _Scheduler_priority_Enqueue, /* enqueue entry point */ \ |
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48 | _Scheduler_priority_Enqueue_first, /* enqueue_first entry point */ \ |
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49 | _Scheduler_priority_Extract, /* extract entry point */ \ |
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50 | _Scheduler_priority_Priority_compare, /* compares two priorities */ \ |
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51 | _Scheduler_priority_Release_job, /* new period of task */ \ |
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52 | _Scheduler_priority_Tick /* tick entry point */ \ |
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53 | } |
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54 | |
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55 | /** |
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56 | * Per-thread data related to the _Scheduler_PRIORITY scheduling policy. |
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57 | */ |
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58 | typedef struct { |
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59 | /** This field points to the Ready FIFO for this thread's priority. */ |
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60 | Chain_Control *ready_chain; |
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61 | |
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62 | /** This field contains precalculated priority map indices. */ |
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63 | Priority_bit_map_Information Priority_map; |
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64 | } Scheduler_priority_Per_thread; |
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65 | |
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66 | /** |
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67 | * This routine initializes the priority scheduler. |
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68 | */ |
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69 | void _Scheduler_priority_Initialize(void); |
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70 | |
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71 | /** |
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72 | * @brief Scheduler priority Block |
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73 | * |
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74 | * This routine removes @a the_thread from the scheduling decision, |
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75 | * that is, removes it from the ready queue. It performs |
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76 | * any necessary scheduling operations including the selection of |
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77 | * a new heir thread. |
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78 | * |
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79 | * @param[in] the_thread is the thread to be blocked |
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80 | */ |
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81 | void _Scheduler_priority_Block( |
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82 | Thread_Control *the_thread |
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83 | ); |
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84 | |
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85 | /** |
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86 | * @brief schedule entry point |
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87 | * |
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88 | * This kernel routine sets the heir thread to be the next ready thread |
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89 | * by invoking the_scheduler->ready_queue->operations->first(). |
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90 | */ |
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91 | void _Scheduler_priority_Schedule(void); |
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92 | |
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93 | /** |
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94 | * @brief Allocate Scheduler Priority |
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95 | * |
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96 | * This routine allocates @a the_thread->scheduler. |
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97 | * |
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98 | * @param[in] the_thread is the thread the scheduler is allocating |
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99 | * management memory for |
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100 | */ |
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101 | void * _Scheduler_priority_Allocate( |
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102 | Thread_Control *the_thread |
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103 | ); |
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104 | |
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105 | /** |
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106 | * @brief Free Scheduler Priority |
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107 | * |
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108 | * This routine frees @a the_thread->scheduler. |
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109 | * |
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110 | * @param[in] the_thread is the thread whose scheduler specific information |
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111 | * will be deallocated. |
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112 | */ |
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113 | void _Scheduler_priority_Free( |
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114 | Thread_Control *the_thread |
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115 | ); |
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116 | |
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117 | /** |
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118 | * @brief Update Scheduler priority |
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119 | * This routine updates @a the_thread->scheduler based on @a the_scheduler |
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120 | * structures and thread state. |
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121 | * |
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122 | * @param[in] the_thread will have its scheduler specific information |
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123 | * structure updated. |
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124 | */ |
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125 | void _Scheduler_priority_Update( |
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126 | Thread_Control *the_thread |
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127 | ); |
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128 | |
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129 | /** |
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130 | * @brief Scheduler Priority Unblock |
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131 | * |
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132 | * This routine adds @a the_thread to the scheduling decision, |
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133 | * that is, adds it to the ready queue and |
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134 | * updates any appropriate scheduling variables, for example the heir thread. |
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135 | * |
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136 | * @param[in] the_thread will be unblocked |
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137 | */ |
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138 | void _Scheduler_priority_Unblock( |
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139 | Thread_Control *the_thread |
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140 | ); |
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141 | |
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142 | /** |
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143 | * @brief Scheduler Priority Yield |
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144 | * |
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145 | * This routine is invoked when a thread wishes to voluntarily |
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146 | * transfer control of the processor to another thread in the queue. |
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147 | * |
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148 | * This routine will remove the running THREAD from the ready queue |
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149 | * and place it immediately at the rear of this chain. Reset timeslice |
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150 | * and yield the processor functions both use this routine, therefore if |
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151 | * reset is true and this is the only thread on the queue then the |
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152 | * timeslice counter is reset. The heir THREAD will be updated if the |
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153 | * running is also the currently the heir. |
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154 | * |
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155 | * - INTERRUPT LATENCY: |
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156 | * + ready chain |
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157 | * + select heir |
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158 | */ |
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159 | void _Scheduler_priority_Yield( void ); |
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160 | |
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161 | /** |
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162 | * @brief Scheduler Priority Enqueue |
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163 | * |
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164 | * This routine puts @a the_thread on to the priority-based ready queue. |
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165 | * |
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166 | * @param[in] the_thread will be enqueued at the TAIL of its priority. |
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167 | */ |
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168 | void _Scheduler_priority_Enqueue( |
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169 | Thread_Control *the_thread |
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170 | ); |
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171 | |
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172 | /** |
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173 | * @brief Scheduler Priority Enqueue First |
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174 | * |
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175 | * This routine puts @a the_thread to the head of the ready queue. |
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176 | * For priority-based ready queues, the thread will be the first thread |
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177 | * at its priority level. |
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178 | * |
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179 | * @param[in] the_thread will be enqueued at the HEAD of its priority. |
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180 | */ |
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181 | void _Scheduler_priority_Enqueue_first( |
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182 | Thread_Control *the_thread |
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183 | ); |
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184 | |
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185 | /** |
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186 | * @brief Removes a specific thread from scheduler |
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187 | * |
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188 | * This routine removes a specific thread from the scheduler's set |
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189 | * of ready threads. |
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190 | * |
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191 | * @param[in] the_thread will be extracted from the ready set. |
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192 | */ |
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193 | void _Scheduler_priority_Extract( |
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194 | Thread_Control *the_thread |
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195 | ); |
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196 | |
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197 | /** |
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198 | * @brief Scheduler priority Priority compare |
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199 | * |
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200 | * This routine compares two priorities. |
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201 | */ |
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202 | int _Scheduler_priority_Priority_compare( |
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203 | Priority_Control p1, |
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204 | Priority_Control p2 |
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205 | ); |
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206 | |
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207 | /** |
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208 | * @brief Scheduler priority Release job |
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209 | * |
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210 | * This routine is called when a new job of task is released. |
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211 | * |
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212 | * @param[in] the_thread is the owner of the job. |
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213 | * @param[in] deadline of the new job from now. If equal to 0, |
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214 | * the job was cancelled or deleted. |
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215 | */ |
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216 | void _Scheduler_priority_Release_job ( |
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217 | Thread_Control *the_thread, |
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218 | uint32_t deadline |
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219 | ); |
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220 | |
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221 | /** |
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222 | * @brief Deterministic Priority Scheduler Tick Method |
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223 | * |
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224 | * This routine is invoked as part of processing each clock tick. |
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225 | * It is responsible for determining if the current thread allows |
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226 | * timeslicing and, if so, when its timeslice expires. |
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227 | */ |
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228 | void _Scheduler_priority_Tick( void ); |
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229 | |
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230 | /** |
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231 | * This is the major bit map. |
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232 | */ |
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233 | extern volatile Priority_bit_map_Control _Priority_Major_bit_map; |
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234 | |
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235 | /** |
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236 | * This is the minor bit map. |
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237 | */ |
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238 | extern Priority_bit_map_Control _Priority_Bit_map[16] CPU_STRUCTURE_ALIGNMENT; |
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239 | |
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240 | #ifndef __RTEMS_APPLICATION__ |
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241 | #include <rtems/score/schedulerpriority.inl> |
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242 | #endif |
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243 | |
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244 | #ifdef __cplusplus |
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245 | } |
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246 | #endif |
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247 | |
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248 | /**@}*/ |
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249 | |
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250 | #endif |
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251 | /* end of include file */ |
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