基于时钟驱动的循环调度

实时系统,诸如航空电子系统、空中交通控制系统(Air Traffic Control: ATC)等,从本质上说都是一种分布式实时系统,从理论上说,它们由三种类型的处理器组成,包括数据控制处理器、数据传输处理器和数据处理器.无论是数据控制处理器和数据处理器的数据计算任务,还是数据传输处理器的数据传输任务,它们的执行都必须满足任务的时间约束要求,从而正确完成系统设计的各项应用任务.本文将描述基于时钟驱动的循环调度策略,它不仅适用于对数据计算任务的实时调度,也适用于对数据传输任务的实时调度,最后,分析了此调度策略应用中存在的优势与劣势.

Clock-Driven-Based Cyclic Executive Scheduling

Real-time systems such as avionic systems and air traffic control systems are in essence a kind of distributed real-time systems.In theory,they consists of three basic types of processors including data control processors,data transfer processors and data processors.Both the computation tasks of data control processors and data processors and the data transfer tasks of data transfer processors must be carried out to meet to their timing constraint in order to correctly implement the system missions.This paper will describe the clock-driven-based scheduling strategy for real-time systems.This scheduling strategy can be used not only for scheduling the computation tasks,but also for scheduling the data transfer tasks.In the end,a summary of the advantages and disadvantages of this scheduling strategy will be given.