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Structured Development for Real-Time Systems by Paul T. Ward, Stephen J. Mellor

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Chapter 8. Modeling Hierarchy

Introduction

The modeling guidelines set forth in Chapters 3 and 4 (Processor Modeling and Task Modeling) of this volume describe the creation of a hierarchy of transformation schemas. The top level of this hierarchy has one transformation for each processor into which part of the essential model has been allocated. The next lower level consists of a schema for each processor, with transformations representing the tasks into which that processor’s portion of the essential model has been allocated. The lowest level of the hierarchy has a schema for each task. These schemas contain portions of the essential model that have been modified to remove concurrency and continuous processing and to centralize control. The modifications ...

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