Resource Scopes: Toward Language Support for Compositional Determinism

Complex real-time embedded systems should be compositional and deterministic in the resource, time, and value domains. Determinism eases the engineering of correct systems and compositionality simplifies the assembly of complex systems out of smaller modules. This paper describes the PEACOD framework that is developed to support deterministic behavior for resource consumption, value passing, and timing. The paper introduces the notions of determinism in the context of the resource, value, and temporal domains, and present the resource-scope language construct that can be used to program such deterministic behaviors. Furthermore, the paper also provides semantics for the resource scope construct and uses these semantics to show that the program behavior is preserved under composition. The paper briefly describes the current implementation of PEACOD.