简单ttl懒删除支持

reactor.c

@@ -30,6 +30,7 @@ typedef int (*msg_handler)(struct conn *conn);
 static msg_handler kvs_handler;
 
 extern iouring_ctx_t global_uring_ctx;
+extern int ttl_delete_drain(int budget);
 
 int kvs_request(struct conn *c) {
     return kvs_handler ? kvs_handler(c) : -1;
@@ -603,6 +604,8 @@ int reactor_start(unsigned short port, msg_handler handler) {
                 conn_list[connfd].send_callback(connfd);
             }
         }
+
+        (void)ttl_delete_drain(8);
     }
 
     for (i = 0; i < listen_count; i++) {