Scheduling Control Tasks with Threshold-based Largest Dedication First

Scheduling design of control tasks with fuzzy deadline is considered. By introducing the dedication concept to describe the scheduling criticality of a control task, the largest dedication first with preemption threshold is presented and the preemption threshold is used to control the context switching among control tasks. Every control task is dynamically assigned its priority and feasible preemption threshold that are dependent on its dedication degree and not restricted by the number of tasks. Simulation shows that the scheduling of controller tasks with fuzzy deadline can get implemented with less control performance cost and better scheduling performance. The proposed concept and scheduling algorithm can be widely applied to the design of computer-controlled systems, enrich researches in control and real-time scheduling theories further, and facilitate the application of real-time control technology.