实时控制系统中优先级反转问题的解决方法  

Research on reducing priority inversion problem in real-time control systems

作　　者：唐宇翔[1] 胡景春[1] 

机构地区：[1]南昌航空大学信息工程学院,江西南昌330063

出　　处：《电子技术应用》2010年第4期33-35,39,共4页Application of Electronic Technique

基　　金：江西省教育厅科研基金项目(GJJ08222)

摘　　要：以实时操作系统μC/OS-Ⅱ为例,分析了产生优先级反转的原因,提出了解决该问题的2种方法,即互斥信号量(Mutex)和实现时间片轮番调度法。在保证共享资源互斥访问的前提下,将优先级反转的发生有效地限制在一个层次上,降解了优先级反转现象的发生。Bases on the real-time operating system μC/OS-II, this paper analyses the reason that priority inversion bechanced and then gives exposition how to adjust this problem by mutual exclusive semaphores and time slice. On the precondition, of ensuring mutex visiting of the shared resources, the proposed approach limits the occurrence of priority inversion on one level, and alleviates the priority inversion phenomenon occurrence in μC/OS-II.

关 键 词：嵌入式控制系统 优先级反转 优先级置顶 优先级继承 

分 类 号：TP316.2[自动化与计算机技术—计算机软件与理论]