物联网硬实时控制系统中可调度性分析方法的研究

摘要

建立了具有反馈型和非反馈型任务的物联网硬实时控制系统——混合控制任务系统(hybrid controlling task system,HCTS)的任务模型,以全面准确地描述系统中不同任务的结构、交互模式和运行特征,并提出了一种新的响应时间分析方法,用于验证系统是否满足实时性要求.实验结果表明,HCTS中的任务具有较小的平均最差情况下的响应时间,但是在反馈次数较多的情况下对任务的实时性具有不利影响,从而为HCTS的优化提供了支持.%This paper builds a new task model for hard real-time Internet of Things systems with feedback tasks and non-feedback tasks and presents a new response time analysis method. This task model describes the characteristics of tasks in detail, such as their structures, interaction modes and running manner. The new schedulability analysis method can verify whether real-time requirements are met. Experimental results show the tasks in HCTS have lower average worst-case response time. However, it has some negative influence on the schedulability of tasks in the case of more feedback loops, which provides support for the optimization of HCTS.