1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
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2 | |
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3 | /** |
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4 | * @file |
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5 | * |
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6 | * @ingroup RTEMSScoreScheduler |
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7 | * |
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8 | * @brief This header file provides interfaces of the |
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9 | * @ref RTEMSScoreScheduler related to scheduler nodes which are only used by |
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10 | * the implementation. |
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11 | */ |
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12 | |
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13 | /* |
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14 | * Copyright (C) 2014, 2017 embedded brains GmbH & Co. KG |
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15 | * |
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16 | * Redistribution and use in source and binary forms, with or without |
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17 | * modification, are permitted provided that the following conditions |
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18 | * are met: |
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19 | * 1. Redistributions of source code must retain the above copyright |
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20 | * notice, this list of conditions and the following disclaimer. |
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21 | * 2. Redistributions in binary form must reproduce the above copyright |
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22 | * notice, this list of conditions and the following disclaimer in the |
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23 | * documentation and/or other materials provided with the distribution. |
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24 | * |
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25 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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26 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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29 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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32 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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33 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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34 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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35 | * POSSIBILITY OF SUCH DAMAGE. |
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36 | */ |
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37 | |
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38 | #ifndef _RTEMS_SCORE_SCHEDULERNODEIMPL_H |
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39 | #define _RTEMS_SCORE_SCHEDULERNODEIMPL_H |
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40 | |
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41 | #include <rtems/score/schedulernode.h> |
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42 | #include <rtems/score/priorityimpl.h> |
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43 | |
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44 | /** |
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45 | * @addtogroup RTEMSScoreScheduler |
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46 | * |
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47 | * @{ |
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48 | */ |
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49 | |
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50 | struct _Scheduler_Control; |
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51 | |
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52 | #ifdef __cplusplus |
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53 | extern "C" { |
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54 | #endif /* __cplusplus */ |
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55 | |
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56 | #define SCHEDULER_NODE_OF_WAIT_PRIORITY_NODE( node ) \ |
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57 | RTEMS_CONTAINER_OF( node, Scheduler_Node, Wait.Priority.Node.Node.Chain ) |
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58 | |
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59 | #define SCHEDULER_NODE_OF_WAIT_PRIORITY( node ) \ |
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60 | RTEMS_CONTAINER_OF( node, Scheduler_Node, Wait.Priority ) |
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61 | |
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62 | /** |
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63 | * @brief Maps a priority value to support the append indicator. |
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64 | */ |
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65 | #define SCHEDULER_PRIORITY_MAP( priority ) ( ( priority ) << 1 ) |
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66 | |
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67 | /** |
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68 | * @brief Returns the plain priority value. |
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69 | */ |
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70 | #define SCHEDULER_PRIORITY_UNMAP( priority ) ( ( priority ) >> 1 ) |
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71 | |
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72 | /** |
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73 | * @brief Clears the priority append indicator bit. |
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74 | */ |
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75 | #define SCHEDULER_PRIORITY_PURIFY( priority ) \ |
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76 | ( ( priority ) & ~( (Priority_Control) PRIORITY_GROUP_LAST ) ) |
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77 | |
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78 | /** |
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79 | * @brief Returns the priority control with the append indicator bit set. |
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80 | */ |
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81 | #define SCHEDULER_PRIORITY_APPEND( priority ) \ |
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82 | ( ( priority ) | ( (Priority_Control) PRIORITY_GROUP_LAST ) ) |
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83 | |
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84 | /** |
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85 | * @brief Returns true, if the item should be appended to its priority group, |
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86 | * otherwise returns false and the item should be prepended to its priority |
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87 | * group. |
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88 | */ |
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89 | #define SCHEDULER_PRIORITY_IS_APPEND( priority ) \ |
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90 | ( ( ( priority ) & ( (Priority_Control) PRIORITY_GROUP_LAST ) ) != 0 ) |
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91 | |
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92 | /** |
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93 | * @brief Initializes the node. |
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94 | * |
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95 | * @param scheduler is the scheduler of the node. |
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96 | * |
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97 | * @param[out] node is the node to initialize. |
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98 | * |
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99 | * @param[in, out] the_thread is the thread of the node. |
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100 | * |
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101 | * @param priority is the initial priority of the node. |
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102 | */ |
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103 | static inline void _Scheduler_Node_do_initialize( |
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104 | const struct _Scheduler_Control *scheduler, |
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105 | Scheduler_Node *node, |
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106 | Thread_Control *the_thread, |
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107 | Priority_Control priority |
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108 | ) |
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109 | { |
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110 | node->owner = the_thread; |
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111 | |
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112 | node->Priority.value = priority; |
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113 | |
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114 | #if defined(RTEMS_SMP) |
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115 | _Chain_Initialize_node( &node->Thread.Wait_node ); |
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116 | node->Wait.Priority.scheduler = scheduler; |
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117 | node->user = the_thread; |
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118 | node->idle = NULL; |
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119 | #if CPU_SIZEOF_POINTER != 8 |
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120 | _ISR_lock_Initialize( &node->Priority.Lock, "Scheduler Node Priority" ); |
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121 | #endif |
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122 | #else |
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123 | (void) scheduler; |
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124 | (void) the_thread; |
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125 | #endif |
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126 | } |
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127 | |
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128 | /** |
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129 | * @brief Destroys the node. |
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130 | * |
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131 | * @param scheduler is the scheduler of the node. |
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132 | * |
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133 | * @param[in, out] node is the node to destroy. |
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134 | */ |
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135 | static inline void _Scheduler_Node_do_destroy( |
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136 | const struct _Scheduler_Control *scheduler, |
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137 | Scheduler_Node *node |
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138 | ) |
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139 | { |
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140 | (void) scheduler; |
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141 | |
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142 | #if defined(RTEMS_SMP) && CPU_SIZEOF_POINTER != 8 |
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143 | _ISR_lock_Destroy( &node->Priority.Lock ); |
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144 | #else |
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145 | (void) node; |
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146 | #endif |
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147 | } |
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148 | |
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149 | /** |
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150 | * @brief Gets the scheduler of the node. |
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151 | * |
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152 | * @param node The node to get the scheduler of. |
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153 | * |
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154 | * @return The scheduler of the node. |
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155 | */ |
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156 | static inline const Scheduler_Control *_Scheduler_Node_get_scheduler( |
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157 | const Scheduler_Node *node |
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158 | ) |
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159 | { |
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160 | return _Priority_Get_scheduler( &node->Wait.Priority ); |
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161 | } |
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162 | |
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163 | /** |
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164 | * @brief Gets the owner of the node. |
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165 | * |
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166 | * @param node The node to get the owner of. |
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167 | * |
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168 | * @return The owner of the node. |
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169 | */ |
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170 | static inline Thread_Control *_Scheduler_Node_get_owner( |
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171 | const Scheduler_Node *node |
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172 | ) |
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173 | { |
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174 | return node->owner; |
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175 | } |
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176 | |
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177 | /** |
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178 | * @brief Gets the priority of the node. |
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179 | * |
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180 | * @param node The node to get the priority of. |
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181 | * |
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182 | * @return The priority of the node. |
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183 | */ |
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184 | static inline Priority_Control _Scheduler_Node_get_priority( |
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185 | Scheduler_Node *node |
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186 | ) |
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187 | { |
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188 | Priority_Control priority; |
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189 | |
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190 | #if defined(RTEMS_SMP) && CPU_SIZEOF_POINTER == 8 |
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191 | priority = _Atomic_Fetch_add_ulong( |
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192 | &node->Priority.value, |
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193 | 0, |
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194 | ATOMIC_ORDER_RELAXED |
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195 | ); |
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196 | #else |
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197 | ISR_lock_Context lock_context; |
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198 | |
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199 | _ISR_lock_Acquire( &node->Priority.Lock, &lock_context ); |
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200 | priority = node->Priority.value; |
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201 | _ISR_lock_Release( &node->Priority.Lock, &lock_context ); |
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202 | #endif |
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203 | |
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204 | return priority; |
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205 | } |
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206 | |
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207 | /** |
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208 | * @brief Sets the priority of the node. |
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209 | * |
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210 | * @param[in, out] node is the scheduler node. |
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211 | * |
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212 | * @param new_priority is the priority to set. |
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213 | * |
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214 | * @param group_order is the priority group order, see #PRIORITY_GROUP_FIRST |
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215 | * and #PRIORITY_GROUP_LAST. |
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216 | */ |
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217 | static inline void _Scheduler_Node_set_priority( |
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218 | Scheduler_Node *node, |
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219 | Priority_Control new_priority, |
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220 | Priority_Group_order group_order |
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221 | ) |
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222 | { |
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223 | #if defined(RTEMS_SMP) && CPU_SIZEOF_POINTER == 8 |
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224 | _Atomic_Store_ulong( |
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225 | &node->Priority.value, |
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226 | new_priority | (Priority_Control) group_order, |
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227 | ATOMIC_ORDER_RELAXED |
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228 | ); |
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229 | #else |
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230 | ISR_lock_Context lock_context; |
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231 | |
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232 | _ISR_lock_Acquire( &node->Priority.Lock, &lock_context ); |
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233 | node->Priority.value = new_priority | ( (Priority_Control) group_order ); |
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234 | _ISR_lock_Release( &node->Priority.Lock, &lock_context ); |
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235 | #endif |
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236 | } |
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237 | |
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238 | #if defined(RTEMS_SMP) |
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239 | /** |
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240 | * @brief Gets the user of the node. |
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241 | * |
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242 | * @param node The node to get the user of. |
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243 | * |
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244 | * @return The user of the node. |
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245 | */ |
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246 | static inline Thread_Control *_Scheduler_Node_get_user( |
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247 | const Scheduler_Node *node |
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248 | ) |
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249 | { |
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250 | return node->user; |
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251 | } |
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252 | |
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253 | /** |
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254 | * @brief Sets the user of the node. |
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255 | * |
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256 | * @param[out] node The node to set the user of. |
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257 | * @param user The new user for @a node. |
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258 | */ |
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259 | static inline void _Scheduler_Node_set_user( |
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260 | Scheduler_Node *node, |
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261 | Thread_Control *user |
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262 | ) |
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263 | { |
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264 | node->user = user; |
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265 | } |
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266 | |
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267 | /** |
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268 | * @brief Gets the idle thread of the node. |
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269 | * |
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270 | * @param node The node to get the idle thread of. |
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271 | * |
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272 | * @return The idle thread of @a node. |
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273 | */ |
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274 | static inline Thread_Control *_Scheduler_Node_get_idle( |
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275 | const Scheduler_Node *node |
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276 | ) |
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277 | { |
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278 | return node->idle; |
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279 | } |
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280 | |
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281 | /** |
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282 | * @brief Sets the scheduler node's user to the idle thread. |
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283 | * |
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284 | * @param[in, out] node is the node to receive an idle thread. |
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285 | * |
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286 | * @param idle is the idle thread to use. |
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287 | */ |
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288 | static inline void _Scheduler_Node_set_idle_user( |
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289 | Scheduler_Node *node, |
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290 | Thread_Control *idle |
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291 | ) |
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292 | { |
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293 | _Assert( _Scheduler_Node_get_idle( node ) == NULL ); |
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294 | _Assert( |
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295 | _Scheduler_Node_get_owner( node ) == _Scheduler_Node_get_user( node ) |
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296 | ); |
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297 | |
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298 | _Scheduler_Node_set_user( node, idle ); |
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299 | node->idle = idle; |
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300 | } |
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301 | #endif |
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302 | |
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303 | #ifdef __cplusplus |
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304 | } |
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305 | #endif /* __cplusplus */ |
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306 | |
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307 | /** @} */ |
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308 | |
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309 | #endif /* _RTEMS_SCORE_SCHEDULERNODEIMPL_H */ |
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