1. 比较重要的结构体
struct redis server
{
// 地址
char *bindaddr[REDIS_BINDADDR_MAX]; /* Addresses we should bind to */
// 地址数量
int bindaddr_count; /* Number of addresses in server.bindaddr[] */
el; // 事件状态
// 描述符
int ipfd[REDIS_BINDADDR_MAX]; /* TCP socket file descriptors */ 存放监听的所有套接字 listenToPort 中赋值
// 描述符数量 int ipfd_count; /* Used slots in ipfd[] */
}
struct sharedObjectsStruct: 共享对象
struct sharedObjectsStruct { robj *crlf, *ok, *err, *emptybulk, *czero, *cone, *cnegone, *pong, *space, *colon, *nullbulk, *nullmultibulk, *queued, *emptymultibulk, *wrongtypeerr, *nokeyerr, *syntaxerr, *sameobjecterr, *outofrangeerr, *noscripterr, *loadingerr, *slowscripterr, *bgsaveerr, *masterdownerr, *roslaveerr, *execaborterr, *noautherr, *noreplicaserr, *busykeyerr, *oomerr, *plus, *messagebulk, *pmessagebulk, *subscribebulk, *unsubscribebulk, *psubscribebulk, *punsubscribebulk, *del, *rpop, *lpop, *lpush, *emptyscan, *minstring, *maxstring, *select[REDIS_SHARED_SELECT_CMDS], *integers[REDIS_SHARED_INTEGERS], *mbulkhdr[REDIS_SHARED_BULKHDR_LEN], /* "*<value>\r\n" */ *bulkhdr[REDIS_SHARED_BULKHDR_LEN]; /* "$<value>\r\n" */};
2. 每个redisDb 定义为:
typedef struct redisDb {
// 数据库键空间,保存着数据库中的所有键值对
dict *dict; /* The keyspace for this DB */
// 键的过期时间,字典的键为键,字典的值为过期事件 UNIX 时间戳
dict *expires; /* Timeout of keys with a timeout set */
// 正处于阻塞状态的键
dict *blocking_keys; /* Keys with clients waiting for data (BLPOP) */
// 可以解除阻塞的键
dict *ready_keys; /* Blocked keys that received a PUSH */
// 正在被 WATCH 命令监视的键
dict *watched_keys; /* WATCHED keys for MULTI/EXEC CAS */
struct evictionPoolEntry *eviction_pool; /* Eviction pool of keys */
// 数据库号码
int id; /* Database ID */
// 数据库的键的平均 TTL ,统计信息
long long avg_ttl; /* Average TTL, just for stats */
} redisDb;
流程:
1.