There is a growing interest in using the object paradigm for developing real-time software. We believe that an approach that integrates the advancements in both object modeling and design methods, and real-time scheduling theory is the key to successful use of object technology for real-time software. Surprisingly many past approaches to integrate the two either restrict the object models, or do not allow sophisticated schedulability analysis techniques. In this paper we show how schedulability analysis can be integrated with object-oriented design. More specifically, we show how fixed priority scheduling theory can be applied to designs developed using UML-RT, a specialization of UML for real-time software. We show how a design model built with active objects, and asynchronous and synchronous message passing (as is the case in UML-RT) can be implemented such that the implementation can be analyzed for schedulability. We then develop the response time analysis for such implementations, using which a designer can quickly evaluate the impact of various implementation decisions on schedulability. In conjunction with automatic code-generation, we believe that this will greatly streamline the design and development of real-time software. Based on our interactions with some of the leading commercial vendors, we expect that the results of this work will be integrated with commercial tools in the near future.
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