Method InsertConn

adapter/micro_thread/mt_connection.h:255–261

    }; 

    void InsertConn(TcpKeepConn* conn) {
        if (conn->_keep_flag & TCP_KEEP_IN_LIST) {
            return;
        }
        TAILQ_INSERT_TAIL(&_keep_list, conn, _keep_entry);
        conn->_keep_flag |= TCP_KEEP_IN_LIST;
    };
    
    void RemoveConn(TcpKeepConn* conn) {
        if (!(conn->_keep_flag & TCP_KEEP_IN_LIST)) {