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 ScoreSchedulerSMP |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2013 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 | void _Scheduler_simple_smp_Initialize( void ) |
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26 | { |
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27 | Scheduler_SMP_Control *self = |
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28 | _Workspace_Allocate_or_fatal_error( sizeof( *self ) ); |
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29 | |
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30 | _Chain_Initialize_empty( &self->ready[ 0 ] ); |
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31 | _Chain_Initialize_empty( &self->scheduled ); |
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32 | |
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33 | _Scheduler.information = self; |
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34 | } |
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35 | |
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36 | static Thread_Control *_Scheduler_simple_smp_Get_highest_ready( |
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37 | Scheduler_SMP_Control *self |
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38 | ) |
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39 | { |
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40 | Thread_Control *highest_ready = NULL; |
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41 | Chain_Control *ready = &self->ready[ 0 ]; |
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42 | |
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43 | if ( !_Chain_Is_empty( ready ) ) { |
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44 | highest_ready = (Thread_Control *) _Chain_First( ready ); |
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45 | } |
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46 | |
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47 | return highest_ready; |
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48 | } |
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49 | |
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50 | static void _Scheduler_simple_smp_Move_from_scheduled_to_ready( |
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51 | Scheduler_SMP_Control *self, |
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52 | Thread_Control *scheduled_to_ready |
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53 | ) |
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54 | { |
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55 | _Chain_Extract_unprotected( &scheduled_to_ready->Object.Node ); |
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56 | _Scheduler_simple_Insert_priority_lifo( |
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57 | &self->ready[ 0 ], |
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58 | scheduled_to_ready |
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59 | ); |
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60 | } |
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61 | |
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62 | static void _Scheduler_simple_smp_Move_from_ready_to_scheduled( |
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63 | Scheduler_SMP_Control *self, |
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64 | Thread_Control *ready_to_scheduled |
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65 | ) |
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66 | { |
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67 | _Chain_Extract_unprotected( &ready_to_scheduled->Object.Node ); |
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68 | _Scheduler_simple_Insert_priority_fifo( |
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69 | &self->scheduled, |
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70 | ready_to_scheduled |
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71 | ); |
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72 | } |
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73 | |
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74 | static void _Scheduler_simple_smp_Insert_ready_lifo( |
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75 | Scheduler_SMP_Control *self, |
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76 | Thread_Control *thread |
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77 | ) |
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78 | { |
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79 | _Chain_Insert_ordered_unprotected( |
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80 | &self->ready[ 0 ], |
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81 | &thread->Object.Node, |
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82 | _Scheduler_simple_Insert_priority_lifo_order |
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83 | ); |
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84 | } |
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85 | |
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86 | static void _Scheduler_simple_smp_Insert_ready_fifo( |
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87 | Scheduler_SMP_Control *self, |
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88 | Thread_Control *thread |
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89 | ) |
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90 | { |
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91 | _Chain_Insert_ordered_unprotected( |
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92 | &self->ready[ 0 ], |
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93 | &thread->Object.Node, |
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94 | _Scheduler_simple_Insert_priority_fifo_order |
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95 | ); |
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96 | } |
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97 | |
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98 | static void _Scheduler_simple_smp_Do_extract( |
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99 | Scheduler_SMP_Control *self, |
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100 | Thread_Control *thread |
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101 | ) |
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102 | { |
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103 | ( void ) self; |
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104 | |
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105 | thread->is_in_the_air = thread->is_scheduled; |
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106 | thread->is_scheduled = false; |
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107 | |
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108 | _Chain_Extract_unprotected( &thread->Object.Node ); |
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109 | } |
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110 | |
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111 | void _Scheduler_simple_smp_Block( Thread_Control *thread ) |
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112 | { |
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113 | Scheduler_SMP_Control *self = _Scheduler_SMP_Instance(); |
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114 | |
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115 | _Scheduler_SMP_Block( |
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116 | self, |
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117 | thread, |
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118 | _Scheduler_simple_smp_Do_extract, |
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119 | _Scheduler_simple_smp_Get_highest_ready, |
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120 | _Scheduler_simple_smp_Move_from_ready_to_scheduled |
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121 | ); |
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122 | } |
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123 | |
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124 | static void _Scheduler_simple_smp_Enqueue_ordered( |
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125 | Scheduler_SMP_Control *self, |
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126 | Thread_Control *thread, |
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127 | Chain_Node_order order, |
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128 | Scheduler_SMP_Insert insert_ready, |
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129 | Scheduler_SMP_Insert insert_scheduled |
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130 | ) |
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131 | { |
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132 | _Scheduler_SMP_Enqueue_ordered( |
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133 | self, |
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134 | thread, |
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135 | order, |
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136 | _Scheduler_simple_smp_Get_highest_ready, |
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137 | insert_ready, |
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138 | insert_scheduled, |
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139 | _Scheduler_simple_smp_Move_from_ready_to_scheduled, |
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140 | _Scheduler_simple_smp_Move_from_scheduled_to_ready |
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141 | ); |
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142 | } |
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143 | |
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144 | void _Scheduler_simple_smp_Enqueue_priority_lifo( Thread_Control *thread ) |
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145 | { |
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146 | Scheduler_SMP_Control *self = _Scheduler_SMP_Instance(); |
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147 | |
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148 | _Scheduler_simple_smp_Enqueue_ordered( |
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149 | self, |
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150 | thread, |
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151 | _Scheduler_simple_Insert_priority_lifo_order, |
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152 | _Scheduler_simple_smp_Insert_ready_lifo, |
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153 | _Scheduler_SMP_Insert_scheduled_lifo |
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154 | ); |
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155 | } |
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156 | |
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157 | void _Scheduler_simple_smp_Enqueue_priority_fifo( Thread_Control *thread ) |
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158 | { |
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159 | Scheduler_SMP_Control *self = _Scheduler_SMP_Instance(); |
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160 | |
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161 | _Scheduler_simple_smp_Enqueue_ordered( |
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162 | self, |
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163 | thread, |
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164 | _Scheduler_simple_Insert_priority_fifo_order, |
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165 | _Scheduler_simple_smp_Insert_ready_fifo, |
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166 | _Scheduler_SMP_Insert_scheduled_fifo |
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167 | ); |
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168 | } |
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169 | |
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170 | void _Scheduler_simple_smp_Extract( Thread_Control *thread ) |
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171 | { |
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172 | Scheduler_SMP_Control *self = _Scheduler_SMP_Instance(); |
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173 | |
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174 | _Scheduler_SMP_Extract( |
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175 | self, |
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176 | thread, |
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177 | _Scheduler_simple_smp_Do_extract |
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178 | ); |
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179 | } |
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180 | |
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181 | void _Scheduler_simple_smp_Yield( Thread_Control *thread ) |
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182 | { |
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183 | ISR_Level level; |
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184 | |
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185 | _ISR_Disable( level ); |
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186 | |
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187 | _Scheduler_simple_smp_Extract( thread ); |
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188 | _Scheduler_simple_smp_Enqueue_priority_fifo( thread ); |
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189 | |
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190 | _ISR_Enable( level ); |
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191 | } |
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192 | |
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193 | void _Scheduler_simple_smp_Schedule( Thread_Control *thread ) |
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194 | { |
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195 | Scheduler_SMP_Control *self = _Scheduler_SMP_Instance(); |
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196 | |
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197 | _Scheduler_SMP_Schedule( |
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198 | self, |
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199 | thread, |
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200 | _Scheduler_simple_smp_Get_highest_ready, |
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201 | _Scheduler_simple_smp_Move_from_ready_to_scheduled |
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202 | ); |
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203 | } |
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