如何使用/code存储过程停止MYSQL当前正在运行的任务？

DELIMITER //
CREATE PROCEDURE stop_task(IN task_id INT)
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE pid INT;
    DECLARE cur CURSOR FOR SELECT id FROM information_schema.processlist WHERE id = task_id;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

    OPEN cur;
    read_loop: LOOP
        FETCH cur INTO pid;
        IF done THEN
            LEAVE read_loop;
        END IF;
        KILL pid;
    END LOOP;
    CLOSE cur;
END //
DELIMITER ;

CALL stop_task(task_id);