由于篇幅限制，我无法在这里提供完整的Redis核心数据结构的源码分析。但我可以提供一个简化的示例来说明如何实现一个简单的Redis键值对数据结构。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// 简化的Redis键值对结构
typedef struct kv {
char *key;
char *value;
struct kv *next;
} kv;
// 设置键值对
void set(kv **head, const char *key, const char *value) {
kv *new_kv = malloc(sizeof(kv));
new_kv->key = strdup(key);
new_kv->value = strdup(value);
new_kv->next = *head;
*head = new_kv;
}
// 获取键对应的值
char *get(kv *head, const char *key) {
for (kv *current = head; current != NULL; current = current->next) {
if (strcmp(current->key, key) == 0) {
return current->value;
}
}
return NULL;
}
// 删除键值对
void del(kv **head, const char *key) {
kv *current = *head;
kv *prev = NULL;
while (current != NULL && strcmp(current->key, key) != 0) {
prev = current;
current = current->next;
}
if (current == *head) {
*head = current->next;
} else if (current != NULL) {
prev->next = current->next;
}
free(current->key);
free(current->value);
free(current);
}
int main() {
kv *head = NULL;
// 设置键值对
set(&head, "name", "John");
set(&head, "age", "30");
// 获取键对应的值
char *name = get(head, "name");
printf("name: %s\n", name);
// 删除键值对
del(&head, "age");
// 清理内存
while (head != NULL) {
kv *current = head;
head = head->next;
free(current->key);
free(current->value);
free(current);
}
return 0;
}
这个简化的示例展示了如何实现一个简单的链表结构来存储键值对，并实现了设置、获取和删除操作。这个结构仅用于演示目的，并不是Redis的完整实现。实际的Redis实现要复杂得多，包括哈希表、跳跃列表、LRU管理等。