现场级硬实时网络在线调度

通过对主要周期和非周期硬实时调度算法的深入研究，提出了一种可用于调度链路数据包的在线硬实时调度系统(ARTCS)。该调度器基于单调比率调度算法：RM、风车调度算法Sr和轮询服务器调度算法，能快速判定可调度性，进而自动生成总线表，使调度算法将数据包作为周期数据包进行调度。ARTCS简单、易用，有效地利用了总线带宽。顺序执行总线表，不仅能保证硬实时的性能，而且避免了消息传输中的中断和阻塞，因而较好地满足了现场总线领域中硬实时通信系统的要求。

On-line Scheduler over Field Hard Real-time Network

By thorough research on the prominent periodic and aperiodic scheduling algorithms, an on-line hard real-time scheduler (ARTCS) system is presented, which is applicable to the scheduling of packets over a link. This scheduler, based on Rate Monotonic (RM), pinwheel scheduling algorithm Sr and Polling Server (PS) scheduling algorithms, can rapidly judge the schedulability and then automatically generate a bus table to schedule the packets as the periodic packets. The implementation of the ARTCS is simple, easy to use, and effective for the utilization of bus link. The orderly execution of the bus table can not only guarantee the performance of the hard real-time but also avoid the blockage and interruption of the message transmission. So the scheduler perfectly meets the demand of hard real-time communication system in the field bus domain.'