针对硬实时系统中多种类型任务并存的特点,提出一种三级实时调度模型--TLRtS(three-level real-time scheduling).该模型将整个系统空间划分为硬实时、软实时和非实时空间,分别用来处理硬实时、软实时和非实时任务.TLRtS模型不仅可以动态加载多种实时调度算法,还可以集成相应的资源访问控制协议,解决了任务之间存在资源竞争的问题.实验结果表明,此方法既保证了所有硬实时任务严格按照其时间约束在截止期前完成,又尽可能地提高了软实时和非实时任务的服务质量.%To support the characteristics of hard real-time system, where several types of tasks can coexist simultaneously, in this paper we present a new three-level real-time scheduling (TLRtS) model which is designed to integrate many well-known scheduling algorithms dynamically in one model. The model divides the whole system space into three parts in order to deal with hard real-time, soft real-time and non-real time tasks respectively. The tests show that the proposed method can enhance the Quality-of-Service of soft real-time and non-real time tasks without jeopardizing the guarantee of hard real-time deadlines.
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