1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Simple SMP Scheduler Implementation |
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5 | * |
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6 | * @ingroup ScoreSchedulerSMPSimple |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2013-2014 embedded brains GmbH. |
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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/score/schedulersimplesmp.h> |
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22 | #include <rtems/score/schedulersmpimpl.h> |
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23 | #include <rtems/score/wkspace.h> |
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24 | |
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25 | static Scheduler_simple_SMP_Context * |
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26 | _Scheduler_simple_SMP_Get_context( const Scheduler_Control *scheduler ) |
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27 | { |
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28 | return (Scheduler_simple_SMP_Context *) scheduler->context; |
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29 | } |
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30 | |
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31 | static Scheduler_simple_SMP_Context * |
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32 | _Scheduler_simple_SMP_Self_from_SMP_base( Scheduler_SMP_Context *smp_base ) |
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33 | { |
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34 | return (Scheduler_simple_SMP_Context *) |
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35 | ( (char *) smp_base - offsetof( Scheduler_simple_SMP_Context, Base ) ); |
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36 | } |
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37 | |
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38 | void _Scheduler_simple_smp_Initialize( const Scheduler_Control *scheduler ) |
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39 | { |
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40 | Scheduler_simple_SMP_Context *self = |
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41 | _Scheduler_simple_SMP_Get_context( scheduler ); |
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42 | |
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43 | _Scheduler_SMP_Initialize( &self->Base ); |
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44 | _Chain_Initialize_empty( &self->Ready ); |
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45 | } |
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46 | |
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47 | bool _Scheduler_simple_smp_Allocate( |
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48 | const Scheduler_Control *scheduler, |
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49 | Thread_Control *the_thread |
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50 | ) |
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51 | { |
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52 | Scheduler_SMP_Node *node = _Scheduler_SMP_Node_get( the_thread ); |
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53 | |
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54 | _Scheduler_SMP_Node_initialize( node ); |
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55 | |
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56 | return true; |
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57 | } |
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58 | |
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59 | static Thread_Control *_Scheduler_simple_smp_Get_highest_ready( |
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60 | Scheduler_SMP_Context *smp_base |
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61 | ) |
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62 | { |
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63 | Scheduler_simple_SMP_Context *self = |
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64 | _Scheduler_simple_SMP_Self_from_SMP_base( smp_base ); |
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65 | Thread_Control *highest_ready = NULL; |
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66 | Chain_Control *ready = &self->Ready; |
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67 | |
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68 | if ( !_Chain_Is_empty( ready ) ) { |
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69 | highest_ready = (Thread_Control *) _Chain_First( ready ); |
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70 | } |
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71 | |
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72 | return highest_ready; |
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73 | } |
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74 | |
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75 | static void _Scheduler_simple_smp_Move_from_scheduled_to_ready( |
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76 | Scheduler_SMP_Context *smp_base, |
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77 | Thread_Control *scheduled_to_ready |
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78 | ) |
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79 | { |
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80 | Scheduler_simple_SMP_Context *self = |
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81 | _Scheduler_simple_SMP_Self_from_SMP_base( smp_base ); |
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82 | |
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83 | _Chain_Extract_unprotected( &scheduled_to_ready->Object.Node ); |
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84 | _Scheduler_simple_Insert_priority_lifo( |
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85 | &self->Ready, |
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86 | scheduled_to_ready |
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87 | ); |
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88 | } |
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89 | |
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90 | static void _Scheduler_simple_smp_Move_from_ready_to_scheduled( |
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91 | Scheduler_SMP_Context *smp_base, |
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92 | Thread_Control *ready_to_scheduled |
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93 | ) |
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94 | { |
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95 | _Chain_Extract_unprotected( &ready_to_scheduled->Object.Node ); |
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96 | _Scheduler_simple_Insert_priority_fifo( |
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97 | &smp_base->Scheduled, |
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98 | ready_to_scheduled |
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99 | ); |
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100 | } |
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101 | |
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102 | static void _Scheduler_simple_smp_Insert_ready_lifo( |
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103 | Scheduler_SMP_Context *smp_base, |
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104 | Thread_Control *thread |
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105 | ) |
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106 | { |
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107 | Scheduler_simple_SMP_Context *self = |
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108 | _Scheduler_simple_SMP_Self_from_SMP_base( smp_base ); |
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109 | |
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110 | _Chain_Insert_ordered_unprotected( |
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111 | &self->Ready, |
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112 | &thread->Object.Node, |
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113 | _Scheduler_simple_Insert_priority_lifo_order |
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114 | ); |
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115 | } |
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116 | |
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117 | static void _Scheduler_simple_smp_Insert_ready_fifo( |
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118 | Scheduler_SMP_Context *smp_base, |
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119 | Thread_Control *thread |
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120 | ) |
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121 | { |
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122 | Scheduler_simple_SMP_Context *self = |
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123 | _Scheduler_simple_SMP_Self_from_SMP_base( smp_base ); |
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124 | |
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125 | _Chain_Insert_ordered_unprotected( |
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126 | &self->Ready, |
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127 | &thread->Object.Node, |
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128 | _Scheduler_simple_Insert_priority_fifo_order |
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129 | ); |
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130 | } |
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131 | |
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132 | static void _Scheduler_simple_smp_Do_extract( |
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133 | Scheduler_SMP_Context *smp_base, |
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134 | Thread_Control *thread |
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135 | ) |
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136 | { |
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137 | Scheduler_SMP_Node *node = _Scheduler_SMP_Node_get( thread ); |
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138 | |
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139 | (void) smp_base; |
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140 | |
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141 | if ( node->state == SCHEDULER_SMP_NODE_SCHEDULED ) { |
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142 | _Scheduler_SMP_Node_change_state( node, SCHEDULER_SMP_NODE_IN_THE_AIR ); |
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143 | } else { |
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144 | _Scheduler_SMP_Node_change_state( node, SCHEDULER_SMP_NODE_BLOCKED ); |
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145 | } |
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146 | |
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147 | _Chain_Extract_unprotected( &thread->Object.Node ); |
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148 | } |
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149 | |
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150 | void _Scheduler_simple_smp_Block( |
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151 | const Scheduler_Control *scheduler, |
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152 | Thread_Control *thread |
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153 | ) |
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154 | { |
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155 | Scheduler_simple_SMP_Context *self = |
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156 | _Scheduler_simple_SMP_Get_context( scheduler ); |
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157 | |
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158 | _Scheduler_SMP_Block( |
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159 | &self->Base, |
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160 | thread, |
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161 | _Scheduler_simple_smp_Do_extract, |
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162 | _Scheduler_simple_smp_Get_highest_ready, |
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163 | _Scheduler_simple_smp_Move_from_ready_to_scheduled |
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164 | ); |
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165 | } |
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166 | |
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167 | static void _Scheduler_simple_smp_Enqueue_ordered( |
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168 | Scheduler_SMP_Context *smp_base, |
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169 | Thread_Control *thread, |
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170 | Chain_Node_order order, |
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171 | Scheduler_SMP_Insert insert_ready, |
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172 | Scheduler_SMP_Insert insert_scheduled |
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173 | ) |
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174 | { |
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175 | _Scheduler_SMP_Enqueue_ordered( |
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176 | smp_base, |
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177 | thread, |
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178 | order, |
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179 | _Scheduler_simple_smp_Get_highest_ready, |
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180 | insert_ready, |
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181 | insert_scheduled, |
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182 | _Scheduler_simple_smp_Move_from_ready_to_scheduled, |
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183 | _Scheduler_simple_smp_Move_from_scheduled_to_ready |
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184 | ); |
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185 | } |
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186 | |
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187 | void _Scheduler_simple_smp_Enqueue_priority_lifo( |
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188 | const Scheduler_Control *scheduler, |
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189 | Thread_Control *thread |
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190 | ) |
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191 | { |
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192 | Scheduler_simple_SMP_Context *self = |
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193 | _Scheduler_simple_SMP_Get_context( scheduler ); |
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194 | |
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195 | _Scheduler_simple_smp_Enqueue_ordered( |
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196 | &self->Base, |
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197 | thread, |
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198 | _Scheduler_simple_Insert_priority_lifo_order, |
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199 | _Scheduler_simple_smp_Insert_ready_lifo, |
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200 | _Scheduler_SMP_Insert_scheduled_lifo |
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201 | ); |
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202 | } |
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203 | |
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204 | void _Scheduler_simple_smp_Enqueue_priority_fifo( |
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205 | const Scheduler_Control *scheduler, |
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206 | Thread_Control *thread |
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207 | ) |
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208 | { |
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209 | Scheduler_simple_SMP_Context *self = |
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210 | _Scheduler_simple_SMP_Get_context( scheduler ); |
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211 | |
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212 | _Scheduler_simple_smp_Enqueue_ordered( |
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213 | &self->Base, |
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214 | thread, |
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215 | _Scheduler_simple_Insert_priority_fifo_order, |
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216 | _Scheduler_simple_smp_Insert_ready_fifo, |
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217 | _Scheduler_SMP_Insert_scheduled_fifo |
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218 | ); |
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219 | } |
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220 | |
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221 | void _Scheduler_simple_smp_Extract( |
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222 | const Scheduler_Control *scheduler, |
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223 | Thread_Control *thread |
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224 | ) |
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225 | { |
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226 | Scheduler_simple_SMP_Context *self = |
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227 | _Scheduler_simple_SMP_Get_context( scheduler ); |
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228 | |
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229 | _Scheduler_SMP_Extract( |
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230 | &self->Base, |
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231 | thread, |
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232 | _Scheduler_simple_smp_Do_extract |
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233 | ); |
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234 | } |
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235 | |
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236 | void _Scheduler_simple_smp_Yield( |
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237 | const Scheduler_Control *scheduler, |
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238 | Thread_Control *thread |
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239 | ) |
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240 | { |
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241 | ISR_Level level; |
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242 | |
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243 | _ISR_Disable( level ); |
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244 | |
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245 | _Scheduler_simple_smp_Extract( scheduler, thread ); |
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246 | _Scheduler_simple_smp_Enqueue_priority_fifo( scheduler, thread ); |
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247 | |
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248 | _ISR_Enable( level ); |
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249 | } |
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250 | |
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251 | void _Scheduler_simple_smp_Schedule( |
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252 | const Scheduler_Control *scheduler, |
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253 | Thread_Control *thread |
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254 | ) |
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255 | { |
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256 | Scheduler_simple_SMP_Context *self = |
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257 | _Scheduler_simple_SMP_Get_context( scheduler ); |
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258 | |
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259 | _Scheduler_SMP_Schedule( |
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260 | &self->Base, |
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261 | thread, |
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262 | _Scheduler_simple_smp_Get_highest_ready, |
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263 | _Scheduler_simple_smp_Move_from_ready_to_scheduled |
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264 | ); |
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265 | } |
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266 | |
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267 | void _Scheduler_simple_smp_Start_idle( |
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268 | const Scheduler_Control *scheduler, |
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269 | Thread_Control *thread, |
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270 | Per_CPU_Control *cpu |
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271 | ) |
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272 | { |
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273 | Scheduler_simple_SMP_Context *self = |
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274 | _Scheduler_simple_SMP_Get_context( scheduler ); |
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275 | |
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276 | _Scheduler_SMP_Start_idle( &self->Base, thread, cpu ); |
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277 | } |
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