Abstract: In the μC/OS-Ⅱsystem, the task scheduling mechanism is to execute tasks just according to the tasks’ priority, and the task supervision mechanism may happen unexpected dead-lock accidents because of abnormities of interface to outside environment. In order to solve these problems, some improvement methods are proposed. A new task having the lowest priority is added to the system to take charge of task scheduling agilely, and a variable of time limitation is added to the task data structure to control the task running time for avoiding system breakdown when the task dead-lock happens. The improved system is applied to a massage-chair control system successfully. It illustrates the proposed methods are feasible.

Key words: task scheduling, task supervision, embedded OS

摘要： 针对μC/OS-Ⅱ系统的任务调度机制局限于只能按照优先级顺序执行，其任务监控机制可能因外界接口环境异常而出现死锁等问题，提出一些改进方法，包括在系统中增加一个负责任务调度的优先级最低的任务，以便灵活控制任务的调度。增加时间限制变量来控制任务的执行时间，以避免任务发生死锁时导致整个系统的崩溃。该系统已应用于一款按摩椅产品的控制系统之中，结果证明这些方法是实用可行的。

关键词: 任务调度, 任务监控, 嵌入式操作系统

CLC Number: 

• TP273