Nucleus Plus操作系统的实时性分析与测试

针对操作系统的实时性,以NucleusPlus嵌入式实时操作系统为研究对象,分析其内核的实时机制及上下文切换时间、中断响应时间这两个重要的实时性指标。设计了一个交替等待/获取信号量的方法来测试上下文切换时间,该方法主要是利用信号量的等待和获取来发生上下文切换,经实验验证,比原有的方法所测得的结果更精确,适用范围更广,可为实时应用在选择合适的操作系统方面做参考。

Real-Time Analysis and Tests for Nucleus Plus Operation System

This paper researches Nucleus Plus embedded operation system aiming at its real-time performance. It analysis its kernel of real-time mechanism and the two important criteria: contexts switch timing and interrupt answer timing. Then, it puts forward a method to test the contexts switch timing, that is, making use of the signal load waiting and gaining to switch the context. By experiments, this method is proved to be more accurate than the existing ones, and more applicable in wider scope. It may provide references to select proper operating system in real-time application.