![\"\u6df1\u5165\u63a2\u8ba8Linux\u7684\u7f13\u5b58\u673a\u5236\uff1a\u66ff\u6362\u7b97\u6cd5\u548c\u6027\u80fd\u4f18\u5316\u7b56\u7565\u8be6\u89e3\u63d2\u56fe\"](\"https:\/\/img.php.cn\/upload\/article\/000\/887\/227\/170597605095499.jpg\" "\\"\u6df1\u5165\u63a2\u8ba8Linux\u7684\u7f13\u5b58\u673a\u5236\uff1a\u66ff\u6362\u7b97\u6cd5\u548c\u6027\u80fd\u4f18\u5316\u7b56\u7565\u8be6\u89e3\u63d2\u56fe\\"")
<\/p>\n<\/p>\n
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#include <stdio.h>\n#include <stdlib.h>\n\ntypedef struct Node {\n int key;\n int value;\n struct Node* prev;\n struct Node* next;\n} Node;\n\ntypedef struct LRUCache {\n int capacity;\n int size;\n Node* head;\n Node* tail;\n} LRUCache;\n\nLRUCache* createCache(int capacity) {\n LRUCache* cache = (LRUCache*)malloc(sizeof(LRUCache));\n cache->capacity = capacity;\n cache->size = 0;\n cache->head = (Node*)malloc(sizeof(Node));\n cache->tail = (Node*)malloc(sizeof(Node));\n cache->head->prev = NULL;\n cache->head->next = cache->tail;\n cache->tail->prev = cache->head;\n cache->tail->next = NULL;\n return cache;\n}\n\nvoid deleteNode(LRUCache* cache, Node* node) {\n node->next->prev = node->prev;\n node->prev->next = node->next;\n free(node);\n}\n\nvoid addToHead(LRUCache* cache, Node* node) {\n node->next = cache->head->next;\n node->prev = cache->head;\n cache->head->next->prev = node;\n cache->head->next = node;\n}\n\nint get(LRUCache* cache, int key) {\n Node* node = cache->head->next;\n while (node != cache->tail) {\n if (node->key == key) {\n \/\/ hit, move to head\n node->prev->next = node->next;\n node->next->prev = node->prev;\n addToHead(cache, node);\n return node->value;\n }\n node = node->next;\n }\n return -1; \/\/ cache miss\n}\n\nvoid put(LRUCache* cache, int key, int value) {\n Node* node = cache->head->next;\n while (node != cache->tail) {\n if (node->key == key) {\n \/\/ hit, update value and move to head\n node->value = value;\n node->prev->next = node->next;\n node->next->prev = node->prev;\n addToHead(cache, node);\n return;\n }\n node = node->next;\n }\n if (cache->size >= cache->capacity) {\n \/\/ cache is full, remove least recently used item\n Node* tailNode = cache->tail->prev;\n tailNode->prev->next = cache->tail;\n cache->tail->prev = tailNode->prev;\n free(tailNode);\n cache->size--;\n }\n Node* newNode = (Node*)malloc(sizeof(Node));\n newNode->key = key;\n newNode->value = value;\n addToHead(cache, newNode);\n cache->size++;\n}\n\nint main() {\n LRUCache* cache = createCache(3);\n put(cache, 1, 100);\n put(cache, 2, 200);\n put(cache, 3, 300);\n printf(\"%d\n\", get(cache, 2)); \/\/ Output: 200\n put(cache, 4, 400);\n printf(\"%d\n\", get(cache, 1)); \/\/ Output: -1\n printf(\"%d\n\", get(cache, 3)); \/\/ Output: 300\n printf(\"%d\n\", get(cache, 4)); \/\/ Output: 400\n return 0;\n}<\/stdlib.h><\/stdio.h><\/pre>\n \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
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Linux\u7684\u7f13\u5b58\u673a\u5236\u662f\u63d0\u9ad8\u7cfb\u7edf\u6027\u80fd\u7684\u91cd\u8981\u7ec4\u6210\u90e8\u5206\u3002\u5408\u7406\u9009\u62e9\u7f13\u5b58\u66ff\u6362\u7b97\u6cd5\u548c\u91c7\u53d6\u6027\u80fd\u4f18\u5316\u7b56\u7565\uff0c\u53ef\u4ee5\u63d0\u9ad8Linux\u7f13\u5b58\u7684\u547d\u4e2d\u7387\u548c\u5de5\u4f5c\u6548\u7387\u3002\u901a\u8fc7\u4ee3\u7801\u793a\u4f8b\uff0c\u6211\u4eec\u4e86\u89e3\u4e86\u5982\u4f55\u4f7f\u7528LRU\u7b97\u6cd5\u5b9e\u73b0\u4e00\u4e2a\u7f13\u5b58\u66ff\u6362\u529f\u80fd\u3002\u4e0d\u540c\u7684\u5e94\u7528\u573a\u666f\u548c\u9700\u6c42\u53ef\u4ee5\u9009\u62e9\u9002\u5408\u7684\u7f13\u5b58\u7b97\u6cd5\u548c\u4f18\u5316\u7b56\u7565\uff0c\u4ee5\u8fbe\u5230\u6700\u4f73\u7684\u6027\u80fd\u8868\u73b0\u3002<\/p>\n
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