1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Constants and Structures Associated with the RBTree API in RTEMS |
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5 | * |
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6 | * This include file contains all the constants and structures associated |
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7 | * with the RBTree API in RTEMS. The rbtree is a Red Black Tree that |
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8 | * is part of the Super Core. This is the published interface to that |
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9 | * code. |
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10 | */ |
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11 | |
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12 | /* |
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13 | * Copyright (c) 2010 Gedare Bloom. |
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14 | * |
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15 | * The license and distribution terms for this file may be |
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16 | * found in the file LICENSE in this distribution or at |
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17 | * http://www.rtems.org/license/LICENSE. |
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18 | */ |
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19 | |
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20 | #ifndef _RTEMS_RBTREE_H |
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21 | #define _RTEMS_RBTREE_H |
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22 | |
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23 | #include <rtems/score/rbtree.h> |
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24 | |
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25 | #ifdef __cplusplus |
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26 | extern "C" { |
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27 | #endif |
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28 | |
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29 | /** |
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30 | * @defgroup ClassicRBTrees Red-Black Trees |
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31 | * |
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32 | * @ingroup ClassicRTEMS |
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33 | * |
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34 | * @brief A Red-Black Tree container. |
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35 | * |
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36 | * The red-black tree container offers no internal protection against |
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37 | * concurrent access. The user must ensure that at most one thread at once can |
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38 | * access a red-black tree instance. |
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39 | * |
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40 | * @{ |
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41 | */ |
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42 | |
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43 | /** |
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44 | * @typedef rtems_rbtree_node |
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45 | * |
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46 | * A node that can be manipulated in the rbtree. |
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47 | */ |
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48 | typedef RBTree_Node rtems_rbtree_node; |
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49 | |
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50 | /** |
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51 | * @typedef rtems_rbtree_control |
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52 | * |
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53 | * The rbtree's control anchors the rbtree. |
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54 | */ |
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55 | typedef RBTree_Control rtems_rbtree_control; |
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56 | |
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57 | /** |
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58 | * @copydoc RBTree_Compare_result |
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59 | */ |
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60 | typedef RBTree_Compare_result rtems_rbtree_compare_result; |
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61 | |
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62 | /** |
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63 | * @copydoc RBTree_Compare |
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64 | */ |
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65 | typedef RBTree_Compare rtems_rbtree_compare; |
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66 | |
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67 | /** |
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68 | * @brief RBTree initializer for an empty rbtree with designator @a name. |
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69 | */ |
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70 | #define RTEMS_RBTREE_INITIALIZER_EMPTY(name) \ |
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71 | RBTREE_INITIALIZER_EMPTY(name) |
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72 | |
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73 | /** |
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74 | * @brief RBTree definition for an empty rbtree with designator @a name. |
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75 | */ |
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76 | #define RTEMS_RBTREE_DEFINE_EMPTY(name) \ |
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77 | RBTREE_DEFINE_EMPTY(name) |
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78 | |
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79 | /** |
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80 | * @brief Initialize a RBTree header. |
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81 | * |
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82 | * This routine initializes @a the_rbtree structure to manage the |
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83 | * contiguous array of @a number_nodes nodes which starts at |
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84 | * @a starting_address. Each node is of @a node_size bytes. |
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85 | * |
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86 | * @param[in] the_rbtree is the pointer to rbtree header |
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87 | * @param[in] compare The node compare function. |
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88 | * @param[in] starting_address is the starting address of first node |
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89 | * @param[in] number_nodes is the number of nodes in rbtree |
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90 | * @param[in] node_size is the size of node in bytes |
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91 | * @param[in] is_unique If true, then reject nodes with a duplicate key, else |
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92 | * otherwise. |
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93 | */ |
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94 | void rtems_rbtree_initialize( |
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95 | rtems_rbtree_control *the_rbtree, |
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96 | rtems_rbtree_compare compare, |
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97 | void *starting_address, |
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98 | size_t number_nodes, |
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99 | size_t node_size, |
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100 | bool is_unique |
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101 | ); |
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102 | |
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103 | /** |
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104 | * @brief Initialize this RBTree as Empty |
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105 | * |
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106 | * This routine initializes @a the_rbtree to contain zero nodes. |
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107 | */ |
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108 | RTEMS_INLINE_ROUTINE void rtems_rbtree_initialize_empty( |
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109 | rtems_rbtree_control *the_rbtree |
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110 | ) |
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111 | { |
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112 | _RBTree_Initialize_empty( the_rbtree ); |
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113 | } |
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114 | |
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115 | /** |
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116 | * @brief Set off RBtree. |
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117 | * |
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118 | * This function sets the next and previous fields of the @a node to NULL |
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119 | * indicating the @a node is not part of any rbtree. |
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120 | */ |
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121 | RTEMS_INLINE_ROUTINE void rtems_rbtree_set_off_tree( |
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122 | rtems_rbtree_node *node |
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123 | ) |
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124 | { |
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125 | _RBTree_Set_off_tree( node ); |
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126 | } |
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127 | |
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128 | /** |
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129 | * @brief Is the Node off RBTree. |
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130 | * |
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131 | * This function returns true if the @a node is not on a rbtree. A @a node is |
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132 | * off rbtree if the next and previous fields are set to NULL. |
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133 | */ |
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134 | RTEMS_INLINE_ROUTINE bool rtems_rbtree_is_node_off_tree( |
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135 | const rtems_rbtree_node *node |
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136 | ) |
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137 | { |
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138 | return _RBTree_Is_node_off_tree( node ); |
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139 | } |
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140 | |
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141 | /** |
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142 | * @brief Return pointer to RBTree root. |
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143 | * |
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144 | * This function returns a pointer to the root node of @a the_rbtree. |
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145 | */ |
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146 | RTEMS_INLINE_ROUTINE rtems_rbtree_node *rtems_rbtree_root( |
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147 | const rtems_rbtree_control *the_rbtree |
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148 | ) |
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149 | { |
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150 | return _RBTree_Root( the_rbtree ); |
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151 | } |
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152 | |
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153 | /** |
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154 | * @copydoc _RBTree_Minimum() |
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155 | */ |
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156 | RTEMS_INLINE_ROUTINE rtems_rbtree_node *rtems_rbtree_min( |
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157 | const rtems_rbtree_control *the_rbtree |
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158 | ) |
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159 | { |
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160 | return _RBTree_Minimum( the_rbtree ); |
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161 | } |
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162 | |
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163 | /** |
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164 | * @copydoc _RBTree_Maximum() |
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165 | */ |
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166 | RTEMS_INLINE_ROUTINE rtems_rbtree_node *rtems_rbtree_max( |
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167 | const rtems_rbtree_control *the_rbtree |
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168 | ) |
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169 | { |
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170 | return _RBTree_Maximum( the_rbtree ); |
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171 | } |
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172 | |
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173 | /** |
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174 | * @brief Return pointer to the left child node from this node. |
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175 | * |
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176 | * This function returns a pointer to the left child node of @a the_node. |
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177 | */ |
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178 | RTEMS_INLINE_ROUTINE rtems_rbtree_node *rtems_rbtree_left( |
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179 | const rtems_rbtree_node *the_node |
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180 | ) |
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181 | { |
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182 | return _RBTree_Left( the_node ); |
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183 | } |
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184 | |
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185 | /** |
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186 | * @brief Return pointer to the right child node from this node. |
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187 | * |
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188 | * This function returns a pointer to the right child node of @a the_node. |
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189 | */ |
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190 | RTEMS_INLINE_ROUTINE rtems_rbtree_node *rtems_rbtree_right( |
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191 | const rtems_rbtree_node *the_node |
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192 | ) |
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193 | { |
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194 | return _RBTree_Right( the_node ); |
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195 | } |
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196 | |
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197 | /** |
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198 | * @copydoc _RBTree_Parent() |
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199 | */ |
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200 | RTEMS_INLINE_ROUTINE rtems_rbtree_node *rtems_rbtree_parent( |
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201 | const rtems_rbtree_node *the_node |
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202 | ) |
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203 | { |
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204 | return _RBTree_Parent( the_node ); |
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205 | } |
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206 | |
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207 | /** |
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208 | * @brief Is the RBTree empty. |
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209 | * |
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210 | * This function returns true if there a no nodes on @a the_rbtree and |
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211 | * false otherwise. |
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212 | */ |
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213 | RTEMS_INLINE_ROUTINE bool rtems_rbtree_is_empty( |
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214 | const rtems_rbtree_control *the_rbtree |
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215 | ) |
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216 | { |
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217 | return _RBTree_Is_empty( the_rbtree ); |
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218 | } |
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219 | |
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220 | /** |
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221 | * @brief Is this the minimum node on the RBTree. |
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222 | * |
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223 | * This function returns true if @a the_node is the min node on @a the_rbtree |
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224 | * and false otherwise. |
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225 | */ |
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226 | RTEMS_INLINE_ROUTINE bool rtems_rbtree_is_min( |
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227 | const rtems_rbtree_control *the_rbtree, |
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228 | const rtems_rbtree_node *the_node |
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229 | ) |
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230 | { |
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231 | return rtems_rbtree_min( the_rbtree ) == the_node; |
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232 | } |
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233 | |
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234 | /** |
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235 | * @brief Is this the maximum node on the RBTree. |
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236 | * |
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237 | * This function returns true if @a the_node is the max node on @a the_rbtree |
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238 | * and false otherwise. |
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239 | */ |
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240 | RTEMS_INLINE_ROUTINE bool rtems_rbtree_is_max( |
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241 | const rtems_rbtree_control *the_rbtree, |
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242 | const rtems_rbtree_node *the_node |
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243 | ) |
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244 | { |
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245 | return rtems_rbtree_max( the_rbtree ) == the_node; |
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246 | } |
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247 | |
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248 | /** |
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249 | * @copydoc _RBTree_Is_root() |
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250 | */ |
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251 | RTEMS_INLINE_ROUTINE bool rtems_rbtree_is_root( |
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252 | const rtems_rbtree_node *the_node |
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253 | ) |
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254 | { |
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255 | return _RBTree_Is_root( the_node ); |
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256 | } |
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257 | |
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258 | /** |
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259 | * @copydoc _RBTree_Find() |
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260 | */ |
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261 | RTEMS_INLINE_ROUTINE rtems_rbtree_node* rtems_rbtree_find( |
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262 | const rtems_rbtree_control *the_rbtree, |
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263 | const rtems_rbtree_node *the_node, |
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264 | rtems_rbtree_compare compare, |
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265 | bool is_unique |
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266 | ) |
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267 | { |
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268 | return _RBTree_Find( the_rbtree, the_node, compare, is_unique ); |
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269 | } |
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270 | |
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271 | /** |
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272 | * @copydoc _RBTree_Predecessor() |
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273 | */ |
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274 | RTEMS_INLINE_ROUTINE rtems_rbtree_node* rtems_rbtree_predecessor( |
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275 | const rtems_rbtree_node *node |
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276 | ) |
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277 | { |
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278 | return _RBTree_Predecessor( node ); |
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279 | } |
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280 | |
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281 | /** |
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282 | * @copydoc _RBTree_Successor() |
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283 | */ |
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284 | RTEMS_INLINE_ROUTINE rtems_rbtree_node* rtems_rbtree_successor( |
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285 | const rtems_rbtree_node *node |
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286 | ) |
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287 | { |
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288 | return _RBTree_Successor( node ); |
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289 | } |
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290 | |
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291 | /** |
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292 | * @copydoc _RBTree_Extract() |
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293 | */ |
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294 | RTEMS_INLINE_ROUTINE void rtems_rbtree_extract( |
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295 | rtems_rbtree_control *the_rbtree, |
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296 | rtems_rbtree_node *the_node |
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297 | ) |
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298 | { |
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299 | _RBTree_Extract( the_rbtree, the_node ); |
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300 | } |
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301 | |
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302 | /** |
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303 | * @brief Gets a node with the minimum key value from the red-black tree. |
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304 | * |
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305 | * This function extracts a node with the minimum key value from |
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306 | * tree and returns a pointer to that node if it exists. In case multiple |
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307 | * nodes with a minimum key value exist, then they are extracted in FIFO order. |
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308 | * |
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309 | * @param[in] the_rbtree The red-black tree control. |
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310 | * |
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311 | * @retval NULL The tree is empty. |
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312 | * @retval node A node with the minimal key value on the tree. |
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313 | */ |
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314 | RTEMS_INLINE_ROUTINE rtems_rbtree_node *rtems_rbtree_get_min( |
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315 | rtems_rbtree_control *the_rbtree |
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316 | ) |
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317 | { |
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318 | rtems_rbtree_node *the_node = rtems_rbtree_min( the_rbtree ); |
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319 | |
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320 | if ( the_node != NULL ) { |
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321 | rtems_rbtree_extract( the_rbtree, the_node ); |
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322 | } |
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323 | |
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324 | return the_node; |
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325 | } |
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326 | |
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327 | /** |
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328 | * @brief Gets a node with the maximal key value from the red-black tree. |
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329 | * |
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330 | * This function extracts a node with the maximum key value from tree and |
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331 | * returns a pointer to that node if it exists. In case multiple nodes with a |
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332 | * maximum key value exist, then they are extracted in LIFO order. |
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333 | * |
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334 | * @param[in] the_rbtree The red-black tree control. |
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335 | * |
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336 | * @retval NULL The tree is empty. |
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337 | * @retval node A node with the maximal key value on the tree. |
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338 | */ |
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339 | RTEMS_INLINE_ROUTINE rtems_rbtree_node *rtems_rbtree_get_max( |
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340 | rtems_rbtree_control *the_rbtree |
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341 | ) |
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342 | { |
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343 | rtems_rbtree_node *the_node = rtems_rbtree_max( the_rbtree ); |
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344 | |
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345 | if ( the_node != NULL ) { |
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346 | rtems_rbtree_extract( the_rbtree, the_node ); |
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347 | } |
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348 | |
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349 | return the_node; |
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350 | } |
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351 | |
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352 | /** |
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353 | * @brief Peek at the min node on a rbtree. |
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354 | * |
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355 | * This function returns a pointer to the min node from @a the_rbtree |
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356 | * without changing the tree. If @a the_rbtree is empty, |
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357 | * then NULL is returned. |
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358 | */ |
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359 | RTEMS_INLINE_ROUTINE rtems_rbtree_node *rtems_rbtree_peek_min( |
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360 | const rtems_rbtree_control *the_rbtree |
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361 | ) |
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362 | { |
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363 | return rtems_rbtree_min( the_rbtree ); |
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364 | } |
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365 | |
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366 | /** |
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367 | * @brief Peek at the max node on a rbtree. |
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368 | * |
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369 | * This function returns a pointer to the max node from @a the_rbtree |
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370 | * without changing the tree. If @a the_rbtree is empty, |
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371 | * then NULL is returned. |
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372 | */ |
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373 | RTEMS_INLINE_ROUTINE rtems_rbtree_node *rtems_rbtree_peek_max( |
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374 | const rtems_rbtree_control *the_rbtree |
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375 | ) |
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376 | { |
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377 | return rtems_rbtree_max( the_rbtree ); |
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378 | } |
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379 | |
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380 | /** |
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381 | * @copydoc _RBTree_Insert() |
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382 | */ |
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383 | RTEMS_INLINE_ROUTINE rtems_rbtree_node *rtems_rbtree_insert( |
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384 | rtems_rbtree_control *the_rbtree, |
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385 | rtems_rbtree_node *the_node, |
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386 | rtems_rbtree_compare compare, |
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387 | bool is_unique |
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388 | ) |
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389 | { |
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390 | return _RBTree_Insert( the_rbtree, the_node, compare, is_unique ); |
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391 | } |
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392 | |
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393 | /** @} */ |
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394 | |
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395 | #ifdef __cplusplus |
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396 | } |
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397 | #endif |
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398 | |
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399 | #endif |
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400 | /* end of include file */ |
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