Affiliations: [a] Faculté des Sciences Economiques et de Gestion, Université de Sfax, BP 1088, Sfax 3018, Tunisia, E-mail: hanene@saul.cis.upenn.edu | [b] Computer and Information Science, University of Pennsylvania, Philadelphia, PA 19104, USA, E-mail: lee@central.cis.upenn.edu
Correspondence:
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Correspondence to: Prof. I. Lee.
Abstract: We present Graphical Communicating Shared Resources (GCSR), a formal language for the specification and analysis of real-time systems, including their functional, temporal and resource requirements. GCSR supports the explicit representation of system resources and priorities to arbitrate resource contentions. These features allow a designer to examine resource inherent constraints and to experiment with various resource allocations and scheduling disciplines in order to produce a more dependable specification. In addition, GCSR differs from other graphical languages through its well-defined notions of modularity and hierarchy: dependencies between system components, expressed as communication events, can have a limited scope of visibility, and control ow between components is clearly represented as either an interrupt or exception, i.e., voluntary release of control. Furthermore, GCSR has a precise operational semantics and notions of equivalence that allow the execution and formal analysis of a specification. We present the GCSR language, its toolset, and how properties, e.g., safety can be analyzed within GCSR.
