Real-time Tasks in SDL
System Analysis and Modeling: About Models - SAM 2012, 7th International Workshop on System Analysis and Modeling, Innsbruck, Austria, Lecture Notes in Computer Science (LNCS) 7744, 2012
SDL is a formal design language for distributed systems that is also promoted for real-time systems. To improve its real-time expres- siveness, several language extensions have been proposed. In this work, we present an extension of SDL to specify real-time tasks, a concept used in real-time systems to structure and schedule execution. We model a real-time task in SDL as a hierarchical order of executions of SDL transitions, which may span different SDL processes. Real-time tasks are selected for execution using time-triggered and priority-based scheduling. We formally define real-time tasks, show their syntactical and semantical incorporation in SDL, present the implementation approach in our SDL tool chain, and provide excerpts of a complex MAC protocol showing the use of real-time tasks in SDL.
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