改进的优先级继承协议在μC/OS中的实现

Implementation of an Improved Priority Inheritance Protocol under μC/OS

优先级反转是在基于优先级可剥夺型的实时系统中由于访问共享资源造成阻塞而引起的高优先级任务在低优先级任务之后执行的现象。本文在深入研究相关协议和μC/OS-Ⅱ内核的基础上针对这些缺陷提出了一种改进的优先级继承协议并在μC/OS-Ⅱ上实现了基于该协议的算法。

Priority inversion is a phenomenon that a higher priority task is blocked by a lower priority task when they are sharing the same resource in a real time system based on the priority-driven scheduling. An improved priority inheritance protocol is proposed and the algorithm in μC/OS-Ⅱ is also given.