互斥协议的安全性分析

Safety analysis of mutual exclusion protocol

安全性和活性是两大基本的系统属性,对于指导系统的设计与验证具有重要意义。通过对它们原始定义的形式化梳理,发现其缺乏对状态序列的具体约束。针对这一问题,使用对系统动作刻画更完善的行为时序逻辑进行了重定义,加入了初始状态和转移条件的约束。以此为基础,对互斥这一并发系统的典型属性进行了形式化的分析,由此说明如何判断一个属性是否满足安全性或活性的定义。该技术为实现系统性质的自动推理与验证提供了形式化基础。

Safety and liveness are tow basic types of system property and are very useful for the design and verification of system. This paper pointed out the disadvantage of lacking restricts to state sequence in their original definition. For this problem,it gave redefinition by the temporal logic of action which was more suitable to describe system action. The new formal definition added initial state and constraint conditions for transfer. On this basis,it analyzed the mutual exclusion which was the typical property of concurrent system by formal method. It also shows that how to judge whether a property meets the definition of safety or liveness. This technology provided the formal basic for the automatic reasoning and verification of system property.