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

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Chapter 7. Modeling System Services — Data Management

Introduction

Nearly all essential models require event responses to communicate with one another via stored data. The corresponding implementation models thus must include a description of the stored data implementation. The stored data that must be available to the tasks within a single processor is shown by the portion of the entity-relationship diagram (or the equivalent set of transformation schema stores) allocated to that processor and by the associated data specifications. Data that is shared among a set of processors is thought of as belonging to each of the processors. In this chapter, we shall focus on modeling the implementation of and access to stored data shared among tasks within ...

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