1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Inlined Routines Associated with the Manipulation of the |
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5 | * Priority-Based Scheduling Structures |
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6 | * |
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7 | * This inline file contains all of the inlined routines associated with |
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8 | * the manipulation of the priority-based scheduling structures. |
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9 | */ |
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10 | |
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11 | /* |
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12 | * Copyright (C) 2010 Gedare Bloom. |
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13 | * Copyright (C) 2011 On-Line Applications Research Corporation (OAR). |
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14 | * |
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15 | * The license and distribution terms for this file may be |
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16 | * found in the file LICENSE in this distribution or at |
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17 | * http://www.rtems.org/license/LICENSE. |
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18 | */ |
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19 | |
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20 | #ifndef _RTEMS_SCORE_SCHEDULERPRIORITYIMPL_H |
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21 | #define _RTEMS_SCORE_SCHEDULERPRIORITYIMPL_H |
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22 | |
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23 | #include <rtems/score/schedulerpriority.h> |
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24 | #include <rtems/score/chainimpl.h> |
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25 | #include <rtems/score/prioritybitmapimpl.h> |
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26 | #include <rtems/score/schedulerimpl.h> |
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27 | #include <rtems/score/thread.h> |
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28 | |
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29 | #ifdef __cplusplus |
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30 | extern "C" { |
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31 | #endif |
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32 | |
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33 | /** |
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34 | * @addtogroup ScoreSchedulerDPS |
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35 | */ |
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36 | /**@{**/ |
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37 | |
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38 | RTEMS_INLINE_ROUTINE Scheduler_priority_Context * |
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39 | _Scheduler_priority_Get_context( const Scheduler_Control *scheduler ) |
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40 | { |
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41 | return (Scheduler_priority_Context *) scheduler->context; |
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42 | } |
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43 | |
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44 | /** |
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45 | * @brief Ready queue initialization. |
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46 | * |
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47 | * This routine initializes @a ready_queues for priority-based scheduling. |
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48 | */ |
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49 | RTEMS_INLINE_ROUTINE void _Scheduler_priority_Ready_queue_initialize( |
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50 | Chain_Control *ready_queues |
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51 | ) |
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52 | { |
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53 | size_t index; |
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54 | |
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55 | /* initialize ready queue structures */ |
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56 | for( index=0; index <= PRIORITY_MAXIMUM; index++) |
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57 | _Chain_Initialize_empty( &ready_queues[index] ); |
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58 | } |
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59 | |
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60 | RTEMS_INLINE_ROUTINE Scheduler_priority_Per_thread * |
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61 | _Scheduler_priority_Get_scheduler_info( Thread_Control *thread ) |
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62 | { |
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63 | return ( Scheduler_priority_Per_thread * ) thread->scheduler_info; |
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64 | } |
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65 | |
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66 | /** |
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67 | * @brief Put a thread to the ready queue. |
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68 | * |
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69 | * This routine puts @a the_thread on to the priority-based ready queue. |
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70 | * |
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71 | * @param[in] the_thread The thread to enqueue. |
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72 | * @param[in] bit_map The priority bit map of the scheduler instance. |
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73 | */ |
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74 | RTEMS_INLINE_ROUTINE void _Scheduler_priority_Ready_queue_enqueue( |
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75 | Thread_Control *the_thread, |
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76 | Priority_bit_map_Control *bit_map |
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77 | ) |
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78 | { |
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79 | Scheduler_priority_Per_thread *sched_info_of_thread = |
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80 | _Scheduler_priority_Get_scheduler_info( the_thread ); |
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81 | Chain_Control *ready_chain = sched_info_of_thread->ready_chain; |
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82 | |
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83 | _Chain_Append_unprotected( ready_chain, &the_thread->Object.Node ); |
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84 | _Priority_bit_map_Add( bit_map, &sched_info_of_thread->Priority_map ); |
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85 | } |
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86 | |
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87 | /** |
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88 | * @brief Put a thread to the head of the ready queue. |
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89 | * |
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90 | * This routine puts @a the_thread to the head of the ready queue. |
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91 | * For priority-based ready queues, the thread will be the first thread |
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92 | * at its priority level. |
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93 | * |
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94 | * @param[in] the_thread The thread to enqueue. |
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95 | * @param[in] bit_map The priority bit map of the scheduler instance. |
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96 | */ |
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97 | RTEMS_INLINE_ROUTINE void _Scheduler_priority_Ready_queue_enqueue_first( |
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98 | Thread_Control *the_thread, |
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99 | Priority_bit_map_Control *bit_map |
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100 | ) |
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101 | { |
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102 | Scheduler_priority_Per_thread *sched_info_of_thread = |
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103 | _Scheduler_priority_Get_scheduler_info( the_thread ); |
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104 | Chain_Control *ready_chain = sched_info_of_thread->ready_chain; |
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105 | |
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106 | _Chain_Prepend_unprotected( ready_chain, &the_thread->Object.Node ); |
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107 | _Priority_bit_map_Add( bit_map, &sched_info_of_thread->Priority_map ); |
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108 | } |
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109 | |
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110 | /** |
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111 | * @brief Remove a specific thread from the ready queue. |
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112 | * |
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113 | * This routine removes a specific thread from the specified |
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114 | * priority-based ready queue. |
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115 | * |
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116 | * @param[in] the_thread The thread to extract. |
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117 | * @param[in] bit_map The priority bit map of the scheduler instance. |
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118 | */ |
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119 | RTEMS_INLINE_ROUTINE void _Scheduler_priority_Ready_queue_extract( |
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120 | Thread_Control *the_thread, |
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121 | Priority_bit_map_Control *bit_map |
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122 | ) |
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123 | { |
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124 | Scheduler_priority_Per_thread *sched_info_of_thread = |
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125 | _Scheduler_priority_Get_scheduler_info( the_thread ); |
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126 | Chain_Control *ready_chain = sched_info_of_thread->ready_chain; |
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127 | |
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128 | if ( _Chain_Has_only_one_node( ready_chain ) ) { |
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129 | _Chain_Initialize_empty( ready_chain ); |
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130 | _Priority_bit_map_Remove( bit_map, &sched_info_of_thread->Priority_map ); |
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131 | } else { |
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132 | _Chain_Extract_unprotected( &the_thread->Object.Node ); |
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133 | } |
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134 | } |
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135 | |
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136 | RTEMS_INLINE_ROUTINE void _Scheduler_priority_Extract_body( |
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137 | const Scheduler_Control *scheduler, |
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138 | Thread_Control *the_thread |
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139 | ) |
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140 | { |
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141 | Scheduler_priority_Context *context = |
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142 | _Scheduler_priority_Get_context( scheduler ); |
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143 | |
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144 | _Scheduler_priority_Ready_queue_extract( the_thread, &context->Bit_map ); |
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145 | } |
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146 | |
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147 | /** |
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148 | * @brief Return a pointer to the first thread. |
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149 | * |
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150 | * This routines returns a pointer to the first thread on @a ready_queues. |
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151 | * |
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152 | * @param[in] bit_map The priority bit map of the scheduler instance. |
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153 | * @param[in] ready_queues The ready queues of the scheduler instance. |
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154 | * |
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155 | * @return This method returns the first thread or NULL |
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156 | */ |
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157 | RTEMS_INLINE_ROUTINE Thread_Control *_Scheduler_priority_Ready_queue_first( |
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158 | Priority_bit_map_Control *bit_map, |
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159 | Chain_Control *ready_queues |
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160 | ) |
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161 | { |
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162 | Priority_Control index = _Priority_bit_map_Get_highest( bit_map ); |
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163 | |
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164 | return (Thread_Control *) _Chain_First( &ready_queues[ index ] ); |
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165 | } |
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166 | |
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167 | /** |
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168 | * @brief Requeue a thread on the ready queue. |
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169 | * |
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170 | * This routine is invoked when a thread changes priority and should be |
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171 | * moved to a different position on the ready queue. |
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172 | * |
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173 | * @param[in] the_thread is a pointer to the thread |
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174 | */ |
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175 | RTEMS_INLINE_ROUTINE void _Scheduler_priority_Ready_queue_requeue( |
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176 | Thread_Control *the_thread |
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177 | ) |
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178 | { |
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179 | Scheduler_priority_Per_thread *sched_info_of_thread = |
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180 | _Scheduler_priority_Get_scheduler_info( the_thread ); |
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181 | Chain_Control *ready_chain = sched_info_of_thread->ready_chain; |
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182 | |
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183 | if ( !_Chain_Has_only_one_node( ready_chain ) ) { |
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184 | _Chain_Extract_unprotected( &the_thread->Object.Node ); |
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185 | _Chain_Append_unprotected( ready_chain, &the_thread->Object.Node ); |
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186 | } |
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187 | } |
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188 | |
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189 | /** |
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190 | * @brief Scheduling decision logic. |
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191 | * |
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192 | * This kernel routine implements scheduling decision logic |
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193 | * for priority-based scheduling. |
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194 | */ |
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195 | RTEMS_INLINE_ROUTINE void _Scheduler_priority_Schedule_body( |
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196 | const Scheduler_Control *scheduler, |
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197 | Thread_Control *the_thread, |
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198 | bool force_dispatch |
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199 | ) |
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200 | { |
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201 | Scheduler_priority_Context *context = |
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202 | _Scheduler_priority_Get_context( scheduler ); |
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203 | Thread_Control *heir = _Scheduler_priority_Ready_queue_first( |
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204 | &context->Bit_map, |
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205 | &context->Ready[ 0 ] |
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206 | ); |
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207 | |
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208 | ( void ) the_thread; |
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209 | |
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210 | _Scheduler_Update_heir( heir, force_dispatch ); |
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211 | } |
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212 | |
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213 | RTEMS_INLINE_ROUTINE void _Scheduler_priority_Update_body( |
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214 | Thread_Control *thread, |
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215 | Priority_bit_map_Control *bit_map, |
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216 | Chain_Control *ready_queues |
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217 | ) |
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218 | { |
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219 | Scheduler_priority_Per_thread *sched_info_of_thread = |
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220 | _Scheduler_priority_Get_scheduler_info( thread ); |
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221 | |
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222 | sched_info_of_thread->ready_chain = |
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223 | &ready_queues[ thread->current_priority ]; |
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224 | |
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225 | _Priority_bit_map_Initialize_information( |
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226 | bit_map, |
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227 | &sched_info_of_thread->Priority_map, |
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228 | thread->current_priority |
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229 | ); |
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230 | } |
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231 | |
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232 | /** |
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233 | * @brief Priority comparison. |
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234 | * |
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235 | * This routine implements priority comparison for priority-based |
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236 | * scheduling. |
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237 | * |
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238 | * @return >0 for higher priority, 0 for equal and <0 for lower priority. |
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239 | */ |
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240 | RTEMS_INLINE_ROUTINE int _Scheduler_priority_Priority_compare_body( |
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241 | Priority_Control p1, |
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242 | Priority_Control p2 |
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243 | ) |
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244 | { |
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245 | /* High priority in priority scheduler is represented by low numbers. */ |
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246 | return ( p2 - p1 ); |
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247 | } |
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248 | |
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249 | /** @} */ |
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250 | |
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251 | #ifdef __cplusplus |
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252 | } |
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253 | #endif |
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254 | |
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255 | #endif |
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256 | /* end of include file */ |
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