[72d2ec4d] | 1 | /** |
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| 2 | * @file rtems/chain.inl |
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| 3 | * |
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| 4 | * This include file contains all the constants and structures associated |
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| 5 | * with the Chain API in RTEMS. The chain is a double linked list that |
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| 6 | * is part of the Super Core. This is the published interface to that |
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| 7 | * code. |
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| 8 | * |
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| 9 | * Iterate the node of a chain can be performed with the following code: |
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| 10 | * |
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| 11 | * rtems_chain_control* cc = &object->pending; |
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| 12 | * rtems_chain_node* cn = cc->first; |
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| 13 | * while (!rtems_chain_is_tail (cc, cn)) |
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| 14 | * { |
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| 15 | * cn = cn->next; |
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| 16 | * } |
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| 17 | */ |
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| 18 | |
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| 19 | /* |
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| 20 | * COPYRIGHT (c) 1989-2008. |
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| 21 | * On-Line Applications Research Corporation (OAR). |
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| 22 | * |
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| 23 | * The license and distribution terms for this file may be |
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| 24 | * found in the file LICENSE in this distribution or at |
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| 25 | * http://www.rtems.com/license/LICENSE. |
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| 26 | * |
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| 27 | * $Id$ |
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| 28 | */ |
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| 29 | |
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[ef49476] | 30 | #ifndef _RTEMS_CHAIN_H |
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| 31 | # error "Never use <rtems/chain.inl> directly; include <rtems/chain.h> instead." |
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| 32 | #endif |
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| 33 | |
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[72d2ec4d] | 34 | #ifndef _RTEMS_CHAIN_INL |
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| 35 | #define _RTEMS_CHAIN_INL |
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| 36 | |
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| 37 | #include <rtems/score/chain.inl> |
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| 38 | |
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[db03bcc1] | 39 | /** |
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| 40 | * @brief Initialize a Chain Header |
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| 41 | * |
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| 42 | * This routine initializes @a the_chain structure to manage the |
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| 43 | * contiguous array of @a number_nodes nodes which starts at |
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| 44 | * @a starting_address. Each node is of @a node_size bytes. |
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| 45 | * |
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| 46 | * @param[in] the_chain specifies the chain to initialize |
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| 47 | * @param[in] starting_address is the starting address of the array |
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| 48 | * of elements |
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| 49 | * @param[in] number_nodes is the number of nodes that will be in the chain |
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| 50 | * @param[in] node_size is the size of each node |
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| 51 | */ |
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| 52 | RTEMS_INLINE_ROUTINE void rtems_chain_initialize( |
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| 53 | rtems_chain_control *the_chain, |
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| 54 | void *starting_address, |
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| 55 | size_t number_nodes, |
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| 56 | size_t node_size |
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| 57 | ) |
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| 58 | { |
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| 59 | _Chain_Initialize( the_chain, starting_address, number_nodes, node_size ); |
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| 60 | } |
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| 61 | |
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[72d2ec4d] | 62 | /** |
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| 63 | * @brief Initialize this Chain as Empty |
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| 64 | * |
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| 65 | * This routine initializes the specified chain to contain zero nodes. |
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| 66 | * |
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| 67 | * @param[in] the_chain is the chain to be initialized. |
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| 68 | */ |
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| 69 | RTEMS_INLINE_ROUTINE void rtems_chain_initialize_empty( |
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| 70 | rtems_chain_control *the_chain |
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| 71 | ) |
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| 72 | { |
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| 73 | _Chain_Initialize_empty( the_chain ); |
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| 74 | } |
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| 75 | |
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[eb649786] | 76 | /** |
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| 77 | * @brief Set off chain |
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| 78 | * |
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| 79 | * This function sets the next and previous fields of the @a node to NULL |
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| 80 | * indicating the @a node is not part of a chain. |
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| 81 | * |
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| 82 | * @param[in] node the node set to off chain. |
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| 83 | */ |
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| 84 | RTEMS_INLINE_ROUTINE void rtems_chain_set_off_chain( |
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| 85 | rtems_chain_node *node |
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| 86 | ) |
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| 87 | { |
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| 88 | _Chain_Set_off_chain( node ); |
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| 89 | } |
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| 90 | |
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| 91 | /** |
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| 92 | * @brief Is the Node off Chain |
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| 93 | * |
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| 94 | * This function returns true if the @a node is not on a chain. A @a node is |
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| 95 | * off chain if the next and previous fields are set to NULL. |
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| 96 | * |
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| 97 | * @param[in] node is the node off chain. |
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| 98 | * |
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| 99 | * @return This function returns true if the @a node is off chain. |
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| 100 | */ |
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| 101 | RTEMS_INLINE_ROUTINE bool rtems_chain_is_node_off_chain( |
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| 102 | const rtems_chain_node *node |
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| 103 | ) |
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| 104 | { |
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| 105 | return _Chain_Is_node_off_chain( node ); |
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| 106 | } |
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| 107 | |
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[72d2ec4d] | 108 | /** |
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| 109 | * @brief Is the Chain Node Pointer NULL |
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| 110 | * |
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[484a769] | 111 | * This function returns true if the_node is NULL and false otherwise. |
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[72d2ec4d] | 112 | * |
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| 113 | * @param[in] the_node is the node pointer to check. |
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| 114 | * |
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[484a769] | 115 | * @return This method returns true if the_node is NULL and false otherwise. |
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[72d2ec4d] | 116 | */ |
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[484a769] | 117 | RTEMS_INLINE_ROUTINE bool rtems_chain_is_null_node( |
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[72d2ec4d] | 118 | const rtems_chain_node *the_node |
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| 119 | ) |
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| 120 | { |
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| 121 | return _Chain_Is_null_node( the_node ); |
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| 122 | } |
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| 123 | |
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| 124 | /** |
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| 125 | * @brief Return pointer to Chain Head |
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| 126 | * |
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| 127 | * This function returns a pointer to the first node on the chain. |
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| 128 | * |
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| 129 | * @param[in] the_chain is the chain to be operated upon. |
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| 130 | * |
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[0d15414e] | 131 | * @return This method returns the permanent node of the chain. |
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[72d2ec4d] | 132 | */ |
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| 133 | RTEMS_INLINE_ROUTINE rtems_chain_node *rtems_chain_head( |
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| 134 | rtems_chain_control *the_chain |
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| 135 | ) |
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| 136 | { |
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| 137 | return _Chain_Head( the_chain ); |
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| 138 | } |
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| 139 | |
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| 140 | /** |
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| 141 | * @brief Return pointer to Chain Tail |
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| 142 | * |
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| 143 | * This function returns a pointer to the last node on the chain. |
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| 144 | * |
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| 145 | * @param[in] the_chain is the chain to be operated upon. |
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| 146 | * |
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| 147 | * @return This method returns the permanent tail node of the chain. |
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| 148 | */ |
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| 149 | RTEMS_INLINE_ROUTINE rtems_chain_node *rtems_chain_tail( |
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| 150 | rtems_chain_control *the_chain |
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| 151 | ) |
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| 152 | { |
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| 153 | return _Chain_Tail( the_chain ); |
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| 154 | } |
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| 155 | |
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[0d15414e] | 156 | /** |
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| 157 | * @brief Return pointer to Chain's First node after the permanent head. |
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| 158 | * |
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| 159 | * This function returns a pointer to the first node on the chain after the |
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| 160 | * head. |
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| 161 | * |
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| 162 | * @param[in] the_chain is the chain to be operated upon. |
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| 163 | * |
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| 164 | * @return This method returns the first node of the chain. |
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| 165 | */ |
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| 166 | RTEMS_INLINE_ROUTINE rtems_chain_node *rtems_chain_first( |
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| 167 | rtems_chain_control *the_chain |
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| 168 | ) |
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| 169 | { |
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| 170 | return _Chain_First( the_chain ); |
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| 171 | } |
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| 172 | |
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| 173 | /** |
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| 174 | * @brief Return pointer to Chain's Last node before the permanent tail. |
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| 175 | * |
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| 176 | * This function returns a pointer to the last node on the chain just before |
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| 177 | * the tail. |
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| 178 | * |
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| 179 | * @param[in] the_chain is the chain to be operated upon. |
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| 180 | * |
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| 181 | * @return This method returns the last node of the chain. |
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| 182 | */ |
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| 183 | RTEMS_INLINE_ROUTINE rtems_chain_node *rtems_chain_last( |
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| 184 | rtems_chain_control *the_chain |
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| 185 | ) |
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| 186 | { |
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| 187 | return _Chain_Last( the_chain ); |
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| 188 | } |
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| 189 | |
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| 190 | /** |
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| 191 | * @brief Return pointer the next node from this node |
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| 192 | * |
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| 193 | * This function returns a pointer to the next node after this node. |
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| 194 | * |
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| 195 | * @param[in] the_node is the node to be operated upon. |
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| 196 | * |
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| 197 | * @return This method returns the next node on the chain. |
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| 198 | */ |
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| 199 | RTEMS_INLINE_ROUTINE rtems_chain_node *rtems_chain_next( |
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| 200 | rtems_chain_node *the_node |
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| 201 | ) |
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| 202 | { |
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| 203 | return _Chain_Next( the_node ); |
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| 204 | } |
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| 205 | |
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[eb649786] | 206 | /** |
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| 207 | * @brief Return pointer the previous node from this node |
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| 208 | * |
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| 209 | * This function returns a pointer to the previous node on this chain. |
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| 210 | * |
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| 211 | * @param[in] the_node is the node to be operated upon. |
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| 212 | * |
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| 213 | * @return This method returns the previous node on the chain. |
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| 214 | */ |
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| 215 | RTEMS_INLINE_ROUTINE rtems_chain_node *rtems_chain_previous( |
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| 216 | rtems_chain_node *the_node |
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| 217 | ) |
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| 218 | { |
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| 219 | return _Chain_Previous( the_node ); |
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| 220 | } |
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| 221 | |
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[72d2ec4d] | 222 | /** |
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| 223 | * @brief Are Two Nodes Equal |
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| 224 | * |
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[484a769] | 225 | * This function returns true if @a left and @a right are equal, |
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| 226 | * and false otherwise. |
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[72d2ec4d] | 227 | * |
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| 228 | * @param[in] left is the node on the left hand side of the comparison. |
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| 229 | * @param[in] right is the node on the left hand side of the comparison. |
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| 230 | * |
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[484a769] | 231 | * @return This function returns true if @a left and @a right are equal, |
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| 232 | * and false otherwise. |
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[72d2ec4d] | 233 | */ |
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[484a769] | 234 | RTEMS_INLINE_ROUTINE bool rtems_chain_are_nodes_equal( |
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[72d2ec4d] | 235 | const rtems_chain_node *left, |
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| 236 | const rtems_chain_node *right |
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| 237 | ) |
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| 238 | { |
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| 239 | return _Chain_Are_nodes_equal( left, right ); |
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| 240 | } |
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| 241 | |
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| 242 | /** |
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| 243 | * @brief Is the Chain Empty |
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| 244 | * |
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[484a769] | 245 | * This function returns true if there a no nodes on @a the_chain and |
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| 246 | * false otherwise. |
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[72d2ec4d] | 247 | * |
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| 248 | * @param[in] the_chain is the chain to be operated upon. |
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| 249 | * |
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[484a769] | 250 | * @return This function returns true if there a no nodes on @a the_chain and |
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| 251 | * false otherwise. |
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[72d2ec4d] | 252 | */ |
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[484a769] | 253 | RTEMS_INLINE_ROUTINE bool rtems_chain_is_empty( |
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[72d2ec4d] | 254 | rtems_chain_control *the_chain |
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| 255 | ) |
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| 256 | { |
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| 257 | return _Chain_Is_empty( the_chain ); |
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| 258 | } |
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| 259 | |
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| 260 | /** |
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| 261 | * @brief Is this the First Node on the Chain |
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| 262 | * |
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[484a769] | 263 | * This function returns true if the_node is the first node on a chain and |
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| 264 | * false otherwise. |
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[72d2ec4d] | 265 | * |
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| 266 | * @param[in] the_node is the node the caller wants to know if it is |
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| 267 | * the first node on a chain. |
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| 268 | * |
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[484a769] | 269 | * @return This function returns true if @a the_node is the first node on |
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| 270 | * a chain and false otherwise. |
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[72d2ec4d] | 271 | */ |
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[484a769] | 272 | RTEMS_INLINE_ROUTINE bool rtems_chain_is_first( |
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[72d2ec4d] | 273 | const rtems_chain_node *the_node |
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| 274 | ) |
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| 275 | { |
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| 276 | return _Chain_Is_first( the_node ); |
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| 277 | } |
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| 278 | |
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| 279 | /** |
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| 280 | * @brief Is this the Last Node on the Chain |
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| 281 | * |
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[484a769] | 282 | * This function returns true if @a the_node is the last node on a chain and |
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| 283 | * false otherwise. |
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[72d2ec4d] | 284 | * |
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| 285 | * @param[in] the_node is the node to check as the last node. |
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| 286 | * |
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[484a769] | 287 | * @return This function returns true if @a the_node is the last node on |
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| 288 | * a chain and false otherwise. |
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[72d2ec4d] | 289 | */ |
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[484a769] | 290 | RTEMS_INLINE_ROUTINE bool rtems_chain_is_last( |
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[72d2ec4d] | 291 | const rtems_chain_node *the_node |
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| 292 | ) |
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| 293 | { |
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| 294 | return _Chain_Is_last( the_node ); |
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| 295 | } |
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| 296 | |
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| 297 | /** |
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| 298 | * @brief Does this Chain have only One Node |
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| 299 | * |
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[484a769] | 300 | * This function returns true if there is only one node on @a the_chain and |
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| 301 | * false otherwise. |
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[72d2ec4d] | 302 | * |
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| 303 | * @param[in] the_chain is the chain to be operated upon. |
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| 304 | * |
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[484a769] | 305 | * @return This function returns true if there is only one node on |
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| 306 | * @a the_chain and false otherwise. |
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[72d2ec4d] | 307 | */ |
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[484a769] | 308 | RTEMS_INLINE_ROUTINE bool rtems_chain_has_only_one_node( |
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[72d2ec4d] | 309 | const rtems_chain_control *the_chain |
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| 310 | ) |
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| 311 | { |
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| 312 | return _Chain_Has_only_one_node( the_chain ); |
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| 313 | } |
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| 314 | |
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| 315 | /** |
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| 316 | * @brief Is this Node the Chain Head |
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| 317 | * |
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[484a769] | 318 | * This function returns true if @a the_node is the head of the_chain and |
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| 319 | * false otherwise. |
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[72d2ec4d] | 320 | * |
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| 321 | * @param[in] the_chain is the chain to be operated upon. |
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| 322 | * @param[in] the_node is the node to check for being the Chain Head. |
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| 323 | * |
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[484a769] | 324 | * @return This function returns true if @a the_node is the head of |
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| 325 | * @a the_chain and false otherwise. |
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[72d2ec4d] | 326 | */ |
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[484a769] | 327 | RTEMS_INLINE_ROUTINE bool rtems_chain_is_head( |
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[72d2ec4d] | 328 | rtems_chain_control *the_chain, |
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| 329 | const rtems_chain_node *the_node |
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| 330 | ) |
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| 331 | { |
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| 332 | return _Chain_Is_head( the_chain, the_node ); |
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| 333 | } |
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| 334 | |
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| 335 | /** |
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| 336 | * @brief Is this Node the Chail Tail |
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| 337 | * |
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[484a769] | 338 | * This function returns true if the_node is the tail of the_chain and |
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| 339 | * false otherwise. |
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[72d2ec4d] | 340 | * |
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| 341 | * @param[in] the_chain is the chain to be operated upon. |
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| 342 | * @param[in] the_node is the node to check for being the Chain Tail. |
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| 343 | */ |
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[484a769] | 344 | RTEMS_INLINE_ROUTINE bool rtems_chain_is_tail( |
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[72d2ec4d] | 345 | rtems_chain_control *the_chain, |
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| 346 | const rtems_chain_node *the_node |
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| 347 | ) |
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| 348 | { |
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| 349 | return _Chain_Is_tail( the_chain, the_node ); |
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| 350 | } |
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| 351 | |
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| 352 | /** |
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| 353 | * @brief Extract the specified node from a chain |
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| 354 | * |
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| 355 | * This routine extracts @a the_node from the chain on which it resides. |
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| 356 | * It disables interrupts to ensure the atomicity of the |
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| 357 | * extract operation. |
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| 358 | * |
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| 359 | * @arg the_node specifies the node to extract |
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| 360 | */ |
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| 361 | RTEMS_INLINE_ROUTINE void rtems_chain_extract( |
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| 362 | rtems_chain_node *the_node |
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| 363 | ) |
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| 364 | { |
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| 365 | _Chain_Extract( the_node ); |
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| 366 | } |
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| 367 | |
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[b8af65a] | 368 | /** |
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| 369 | * @brief Extract the specified node from a chain (unprotected). |
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| 370 | * |
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| 371 | * This routine extracts @a the_node from the chain on which it resides. |
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| 372 | * |
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| 373 | * @note It does NOT disable interrupts to ensure the atomicity of the |
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| 374 | * append operation. |
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| 375 | */ |
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| 376 | RTEMS_INLINE_ROUTINE void rtems_chain_extract_unprotected( |
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| 377 | rtems_chain_node *the_node |
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| 378 | ) |
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| 379 | { |
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| 380 | _Chain_Extract_unprotected( the_node ); |
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| 381 | } |
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| 382 | |
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[72d2ec4d] | 383 | /** |
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| 384 | * @brief Obtain the first node on a chain |
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| 385 | * |
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| 386 | * This function removes the first node from @a the_chain and returns |
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| 387 | * a pointer to that node. If @a the_chain is empty, then NULL is returned. |
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| 388 | * |
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| 389 | * @return This method returns a pointer a node. If a node was removed, |
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| 390 | * then a pointer to that node is returned. If @a the_chain was |
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| 391 | * empty, then NULL is returned. |
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| 392 | * |
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| 393 | * @note It disables interrupts to ensure the atomicity of the get operation. |
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| 394 | */ |
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| 395 | RTEMS_INLINE_ROUTINE rtems_chain_node *rtems_chain_get( |
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| 396 | rtems_chain_control *the_chain |
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| 397 | ) |
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| 398 | { |
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| 399 | return _Chain_Get( the_chain ); |
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| 400 | } |
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| 401 | |
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[57b5d149] | 402 | /** |
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| 403 | * @brief See _Chain_Get_unprotected(). |
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| 404 | */ |
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| 405 | RTEMS_INLINE_ROUTINE rtems_chain_node *rtems_chain_get_unprotected( |
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| 406 | rtems_chain_control *the_chain |
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| 407 | ) |
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| 408 | { |
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| 409 | return _Chain_Get_unprotected( the_chain ); |
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| 410 | } |
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| 411 | |
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[72d2ec4d] | 412 | /** |
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| 413 | * @brief Insert a node on a chain |
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| 414 | * |
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| 415 | * This routine inserts @a the_node on a chain immediately following |
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| 416 | * @a after_node. |
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| 417 | * |
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| 418 | * @note It disables interrupts to ensure the atomicity |
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| 419 | * of the extract operation. |
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| 420 | */ |
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| 421 | RTEMS_INLINE_ROUTINE void rtems_chain_insert( |
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| 422 | rtems_chain_node *after_node, |
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| 423 | rtems_chain_node *the_node |
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| 424 | ) |
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| 425 | { |
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| 426 | _Chain_Insert( after_node, the_node ); |
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| 427 | } |
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| 428 | |
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[57b5d149] | 429 | /** |
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| 430 | * @brief See _Chain_Insert_unprotected(). |
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| 431 | */ |
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| 432 | RTEMS_INLINE_ROUTINE void rtems_chain_insert_unprotected( |
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| 433 | rtems_chain_node *after_node, |
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| 434 | rtems_chain_node *the_node |
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| 435 | ) |
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| 436 | { |
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| 437 | _Chain_Insert_unprotected( after_node, the_node ); |
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| 438 | } |
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| 439 | |
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[72d2ec4d] | 440 | /** |
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| 441 | * @brief Append a node on the end of a chain |
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| 442 | * |
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| 443 | * This routine appends @a the_node onto the end of @a the_chain. |
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| 444 | * |
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| 445 | * @note It disables interrupts to ensure the atomicity of the |
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| 446 | * append operation. |
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| 447 | */ |
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| 448 | RTEMS_INLINE_ROUTINE void rtems_chain_append( |
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| 449 | rtems_chain_control *the_chain, |
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| 450 | rtems_chain_node *the_node |
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| 451 | ) |
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| 452 | { |
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| 453 | _Chain_Append( the_chain, the_node ); |
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| 454 | } |
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| 455 | |
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[0015131] | 456 | /** |
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| 457 | * @brief Append a node on the end of a chain (unprotected) |
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| 458 | * |
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| 459 | * This routine appends @a the_node onto the end of @a the_chain. |
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| 460 | * |
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| 461 | * @note It does NOT disable interrupts to ensure the atomicity of the |
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| 462 | * append operation. |
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| 463 | */ |
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| 464 | RTEMS_INLINE_ROUTINE void rtems_chain_append_unprotected( |
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| 465 | rtems_chain_control *the_chain, |
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| 466 | rtems_chain_node *the_node |
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| 467 | ) |
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| 468 | { |
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| 469 | _Chain_Append_unprotected( the_chain, the_node ); |
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| 470 | } |
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| 471 | |
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[72d2ec4d] | 472 | /** @brief Prepend a Node |
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| 473 | * |
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| 474 | * This routine prepends the_node onto the front of the_chain. |
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| 475 | * |
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| 476 | * @param[in] the_chain is the chain to be operated upon. |
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| 477 | * @param[in] the_node is the node to be prepended. |
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| 478 | * |
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| 479 | * @note It disables interrupts to ensure the atomicity of the |
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| 480 | * prepend operation. |
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| 481 | */ |
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| 482 | RTEMS_INLINE_ROUTINE void rtems_chain_prepend( |
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| 483 | rtems_chain_control *the_chain, |
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| 484 | rtems_chain_node *the_node |
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| 485 | ) |
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| 486 | { |
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| 487 | _Chain_Prepend( the_chain, the_node ); |
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| 488 | } |
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| 489 | |
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[0015131] | 490 | /** @brief Prepend a Node (unprotected) |
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| 491 | * |
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| 492 | * This routine prepends the_node onto the front of the_chain. |
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| 493 | * |
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| 494 | * @param[in] the_chain is the chain to be operated upon. |
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| 495 | * @param[in] the_node is the node to be prepended. |
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| 496 | * |
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| 497 | * @note It does NOT disable interrupts to ensure the atomicity of the |
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| 498 | * prepend operation. |
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| 499 | */ |
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| 500 | RTEMS_INLINE_ROUTINE void rtems_chain_prepend_unprotected( |
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| 501 | rtems_chain_control *the_chain, |
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| 502 | rtems_chain_node *the_node |
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| 503 | ) |
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| 504 | { |
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| 505 | _Chain_Prepend_unprotected( the_chain, the_node ); |
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| 506 | } |
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| 507 | |
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[72d2ec4d] | 508 | #endif |
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| 509 | /* end of include file */ |
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