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 | |
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24 | static Scheduler_simple_SMP_Context * |
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25 | _Scheduler_simple_SMP_Get_context( const Scheduler_Control *scheduler ) |
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26 | { |
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27 | return (Scheduler_simple_SMP_Context *) _Scheduler_Get_context( scheduler ); |
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28 | } |
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29 | |
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30 | static Scheduler_simple_SMP_Context * |
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31 | _Scheduler_simple_SMP_Get_self( Scheduler_Context *context ) |
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32 | { |
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33 | return (Scheduler_simple_SMP_Context *) context; |
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34 | } |
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35 | |
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36 | void _Scheduler_simple_SMP_Initialize( const Scheduler_Control *scheduler ) |
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37 | { |
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38 | Scheduler_simple_SMP_Context *self = |
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39 | _Scheduler_simple_SMP_Get_context( scheduler ); |
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40 | |
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41 | _Scheduler_SMP_Initialize( &self->Base ); |
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42 | _Chain_Initialize_empty( &self->Ready ); |
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43 | } |
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44 | |
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45 | void _Scheduler_simple_SMP_Node_initialize( |
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46 | const Scheduler_Control *scheduler, |
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47 | Thread_Control *the_thread |
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48 | ) |
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49 | { |
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50 | Scheduler_SMP_Node *node = _Scheduler_SMP_Thread_get_node( the_thread ); |
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51 | |
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52 | _Scheduler_SMP_Node_initialize( node, the_thread ); |
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53 | } |
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54 | |
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55 | static void _Scheduler_simple_SMP_Do_update( |
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56 | Scheduler_Context *context, |
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57 | Scheduler_Node *node_to_update, |
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58 | Priority_Control new_priority |
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59 | ) |
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60 | { |
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61 | Scheduler_SMP_Node *node = _Scheduler_SMP_Node_downcast( node_to_update ); |
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62 | |
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63 | (void) context; |
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64 | |
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65 | _Scheduler_SMP_Node_update_priority( node, new_priority ); |
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66 | } |
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67 | |
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68 | void _Scheduler_simple_SMP_Update_priority( |
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69 | const Scheduler_Control *scheduler, |
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70 | Thread_Control *thread, |
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71 | Priority_Control new_priority |
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72 | ) |
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73 | { |
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74 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
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75 | Scheduler_Node *node = _Scheduler_Thread_get_node( thread ); |
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76 | |
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77 | _Scheduler_simple_SMP_Do_update( context, node, new_priority ); |
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78 | } |
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79 | |
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80 | static Scheduler_Node *_Scheduler_simple_SMP_Get_highest_ready( |
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81 | Scheduler_Context *context, |
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82 | Scheduler_Node *node |
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83 | ) |
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84 | { |
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85 | Scheduler_simple_SMP_Context *self = |
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86 | _Scheduler_simple_SMP_Get_self( context ); |
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87 | |
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88 | (void) node; |
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89 | |
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90 | return (Scheduler_Node *) _Chain_First( &self->Ready ); |
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91 | } |
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92 | |
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93 | static void _Scheduler_simple_SMP_Move_from_scheduled_to_ready( |
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94 | Scheduler_Context *context, |
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95 | Scheduler_Node *scheduled_to_ready |
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96 | ) |
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97 | { |
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98 | Scheduler_simple_SMP_Context *self = |
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99 | _Scheduler_simple_SMP_Get_self( context ); |
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100 | |
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101 | _Chain_Extract_unprotected( &scheduled_to_ready->Node ); |
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102 | _Chain_Insert_ordered_unprotected( |
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103 | &self->Ready, |
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104 | &scheduled_to_ready->Node, |
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105 | _Scheduler_SMP_Insert_priority_lifo_order |
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106 | ); |
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107 | } |
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108 | |
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109 | static void _Scheduler_simple_SMP_Move_from_ready_to_scheduled( |
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110 | Scheduler_Context *context, |
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111 | Scheduler_Node *ready_to_scheduled |
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112 | ) |
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113 | { |
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114 | Scheduler_simple_SMP_Context *self = |
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115 | _Scheduler_simple_SMP_Get_self( context ); |
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116 | |
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117 | _Chain_Extract_unprotected( &ready_to_scheduled->Node ); |
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118 | _Chain_Insert_ordered_unprotected( |
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119 | &self->Base.Scheduled, |
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120 | &ready_to_scheduled->Node, |
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121 | _Scheduler_SMP_Insert_priority_fifo_order |
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122 | ); |
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123 | } |
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124 | |
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125 | static void _Scheduler_simple_SMP_Insert_ready_lifo( |
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126 | Scheduler_Context *context, |
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127 | Scheduler_Node *node_to_insert |
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128 | ) |
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129 | { |
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130 | Scheduler_simple_SMP_Context *self = |
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131 | _Scheduler_simple_SMP_Get_self( context ); |
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132 | |
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133 | _Chain_Insert_ordered_unprotected( |
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134 | &self->Ready, |
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135 | &node_to_insert->Node, |
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136 | _Scheduler_SMP_Insert_priority_lifo_order |
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137 | ); |
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138 | } |
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139 | |
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140 | static void _Scheduler_simple_SMP_Insert_ready_fifo( |
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141 | Scheduler_Context *context, |
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142 | Scheduler_Node *node_to_insert |
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143 | ) |
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144 | { |
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145 | Scheduler_simple_SMP_Context *self = |
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146 | _Scheduler_simple_SMP_Get_self( context ); |
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147 | |
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148 | _Chain_Insert_ordered_unprotected( |
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149 | &self->Ready, |
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150 | &node_to_insert->Node, |
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151 | _Scheduler_SMP_Insert_priority_fifo_order |
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152 | ); |
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153 | } |
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154 | |
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155 | static void _Scheduler_simple_SMP_Extract_from_ready( |
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156 | Scheduler_Context *context, |
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157 | Scheduler_Node *node_to_extract |
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158 | ) |
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159 | { |
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160 | (void) context; |
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161 | |
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162 | _Chain_Extract_unprotected( &node_to_extract->Node ); |
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163 | } |
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164 | |
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165 | void _Scheduler_simple_SMP_Block( |
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166 | const Scheduler_Control *scheduler, |
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167 | Thread_Control *thread |
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168 | ) |
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169 | { |
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170 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
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171 | |
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172 | _Scheduler_SMP_Block( |
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173 | context, |
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174 | thread, |
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175 | _Scheduler_simple_SMP_Extract_from_ready, |
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176 | _Scheduler_simple_SMP_Get_highest_ready, |
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177 | _Scheduler_simple_SMP_Move_from_ready_to_scheduled, |
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178 | _Scheduler_SMP_Allocate_processor_lazy |
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179 | ); |
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180 | } |
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181 | |
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182 | static Thread_Control *_Scheduler_simple_SMP_Enqueue_ordered( |
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183 | Scheduler_Context *context, |
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184 | Scheduler_Node *node, |
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185 | Thread_Control *needs_help, |
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186 | Chain_Node_order order, |
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187 | Scheduler_SMP_Insert insert_ready, |
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188 | Scheduler_SMP_Insert insert_scheduled |
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189 | ) |
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190 | { |
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191 | return _Scheduler_SMP_Enqueue_ordered( |
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192 | context, |
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193 | node, |
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194 | needs_help, |
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195 | order, |
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196 | insert_ready, |
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197 | insert_scheduled, |
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198 | _Scheduler_simple_SMP_Move_from_scheduled_to_ready, |
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199 | _Scheduler_SMP_Get_lowest_scheduled, |
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200 | _Scheduler_SMP_Allocate_processor_lazy |
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201 | ); |
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202 | } |
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203 | |
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204 | static Thread_Control *_Scheduler_simple_SMP_Enqueue_lifo( |
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205 | Scheduler_Context *context, |
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206 | Scheduler_Node *node, |
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207 | Thread_Control *needs_help |
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208 | ) |
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209 | { |
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210 | return _Scheduler_simple_SMP_Enqueue_ordered( |
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211 | context, |
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212 | node, |
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213 | needs_help, |
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214 | _Scheduler_SMP_Insert_priority_lifo_order, |
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215 | _Scheduler_simple_SMP_Insert_ready_lifo, |
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216 | _Scheduler_SMP_Insert_scheduled_lifo |
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217 | ); |
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218 | } |
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219 | |
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220 | static Thread_Control *_Scheduler_simple_SMP_Enqueue_fifo( |
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221 | Scheduler_Context *context, |
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222 | Scheduler_Node *node, |
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223 | Thread_Control *needs_help |
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224 | ) |
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225 | { |
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226 | return _Scheduler_simple_SMP_Enqueue_ordered( |
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227 | context, |
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228 | node, |
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229 | needs_help, |
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230 | _Scheduler_SMP_Insert_priority_fifo_order, |
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231 | _Scheduler_simple_SMP_Insert_ready_fifo, |
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232 | _Scheduler_SMP_Insert_scheduled_fifo |
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233 | ); |
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234 | } |
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235 | |
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236 | static Thread_Control *_Scheduler_simple_SMP_Enqueue_scheduled_ordered( |
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237 | Scheduler_Context *context, |
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238 | Scheduler_Node *node, |
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239 | Chain_Node_order order, |
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240 | Scheduler_SMP_Insert insert_ready, |
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241 | Scheduler_SMP_Insert insert_scheduled |
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242 | ) |
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243 | { |
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244 | return _Scheduler_SMP_Enqueue_scheduled_ordered( |
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245 | context, |
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246 | node, |
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247 | order, |
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248 | _Scheduler_simple_SMP_Get_highest_ready, |
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249 | insert_ready, |
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250 | insert_scheduled, |
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251 | _Scheduler_simple_SMP_Move_from_ready_to_scheduled, |
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252 | _Scheduler_SMP_Allocate_processor_lazy |
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253 | ); |
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254 | } |
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255 | |
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256 | static Thread_Control *_Scheduler_simple_SMP_Enqueue_scheduled_lifo( |
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257 | Scheduler_Context *context, |
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258 | Scheduler_Node *node |
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259 | ) |
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260 | { |
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261 | return _Scheduler_simple_SMP_Enqueue_scheduled_ordered( |
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262 | context, |
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263 | node, |
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264 | _Scheduler_SMP_Insert_priority_lifo_order, |
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265 | _Scheduler_simple_SMP_Insert_ready_lifo, |
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266 | _Scheduler_SMP_Insert_scheduled_lifo |
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267 | ); |
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268 | } |
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269 | |
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270 | static Thread_Control *_Scheduler_simple_SMP_Enqueue_scheduled_fifo( |
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271 | Scheduler_Context *context, |
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272 | Scheduler_Node *node |
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273 | ) |
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274 | { |
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275 | return _Scheduler_simple_SMP_Enqueue_scheduled_ordered( |
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276 | context, |
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277 | node, |
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278 | _Scheduler_SMP_Insert_priority_fifo_order, |
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279 | _Scheduler_simple_SMP_Insert_ready_fifo, |
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280 | _Scheduler_SMP_Insert_scheduled_fifo |
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281 | ); |
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282 | } |
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283 | |
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284 | Thread_Control *_Scheduler_simple_SMP_Unblock( |
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285 | const Scheduler_Control *scheduler, |
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286 | Thread_Control *thread |
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287 | ) |
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288 | { |
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289 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
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290 | |
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291 | return _Scheduler_SMP_Unblock( |
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292 | context, |
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293 | thread, |
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294 | _Scheduler_simple_SMP_Enqueue_fifo |
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295 | ); |
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296 | } |
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297 | |
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298 | Thread_Control *_Scheduler_simple_SMP_Change_priority( |
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299 | const Scheduler_Control *scheduler, |
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300 | Thread_Control *thread, |
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301 | Priority_Control new_priority, |
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302 | bool prepend_it |
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303 | ) |
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304 | { |
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305 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
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306 | |
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307 | return _Scheduler_SMP_Change_priority( |
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308 | context, |
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309 | thread, |
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310 | new_priority, |
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311 | prepend_it, |
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312 | _Scheduler_simple_SMP_Extract_from_ready, |
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313 | _Scheduler_simple_SMP_Do_update, |
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314 | _Scheduler_simple_SMP_Enqueue_fifo, |
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315 | _Scheduler_simple_SMP_Enqueue_lifo, |
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316 | _Scheduler_simple_SMP_Enqueue_scheduled_fifo, |
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317 | _Scheduler_simple_SMP_Enqueue_scheduled_lifo |
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318 | ); |
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319 | } |
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320 | |
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321 | Thread_Control *_Scheduler_simple_SMP_Yield( |
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322 | const Scheduler_Control *scheduler, |
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323 | Thread_Control *thread |
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324 | ) |
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325 | { |
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326 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
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327 | |
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328 | return _Scheduler_SMP_Yield( |
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329 | context, |
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330 | thread, |
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331 | _Scheduler_simple_SMP_Extract_from_ready, |
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332 | _Scheduler_simple_SMP_Enqueue_fifo, |
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333 | _Scheduler_simple_SMP_Enqueue_scheduled_fifo |
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334 | ); |
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335 | } |
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