Reliability of event-triggered task activation for hard real-timesystems

摘要

Real-time systems which have to respond to environmental statechanges within a very short latency period are often usingevent-triggered task activation. If the system has to work even in caseof sensor failures, event-triggered task activation is not reliable.Task activations may occur too early, thus causing a system overload,they may occur too late or are entirely omitted. To overcome theseproblems the task-splitting model is introduced, which integrates faulttolerance into the analysis and construction of hard real-time systems.This model controls event-triggered task activations to handle faultswhile guaranteeing timely reponse to changes of environmental states.The task-splitting model is independent of any particular schedulingalgorithm, it is based on a general task model. The result of this workhas influenced the design of a robust engine controller of the nextgeneration