BigActors: a model for structure-aware computation
Proceedings of the ACM/IEEE 4th International Conference on Cyber-Physical Systems
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We give formal semantics for a distributed concurrent object-oriented real-time programming language based on a variant of the actor model which includes an extension enabling the specification of time constraints on message-invocation. Real-time semantics must capture both the qualitative and quantitative aspects of the language, and provide a meaning for the real-time constructs. The real-time semantics of our language is given as timed graph, an existing real-time specification formalism. We present the semantics by first defining an operational semantics for the untimed language, and then translating this into a timed graph which interprets the time constructs. Our semantics is formulated independently of the underlying resources needed to execute a program; the semantics of a program thus defines the set of permissible concrete implementations.