Specification and Compositional Verification of Real-Time Systems [Paperback]

The research described in this monograph concerns the formalspecification and compositional verification of real-timesystems. A real-time programminglanguage is considered inwhich concurrent processes communicate by synchronousmessage passing along unidirectional channels. To specifiyfunctional and timing properties of programs, two formalismsare investigated: one using a real-time version of temporallogic, called Metric Temporal Logic, and another which isbasedon extended Hoare triples. Metric Temporal Logicprovides a concise notationto express timing properties andto axiomatize the programming language, whereas Hoare-styleformulae are especially convenient for the verification ofsequential constructs. For both approaches a compositionalproof system has been formulated to verify that a programsatisfies a specification. To deduce timing properties ofprograms, first maximal parallelism is assumed, modeling thesituation in which each process has itsown processor. Next,this model is generalized to multiprogramming where severalprocesses may share a processor and scheduling is based onpriorities. The proof systems are shown to be sound andrelatively complete with respect to a denotational semanticsof the programming language. The theory is illustrated by anexample of a watchdog timer.Compositionality.- Compositionality and real-time.- Adding program variables.- Shared processors.- Concluding remarks.This monograph presents two formal methods for the specification and compositional verification of real-time systems. One uses a real-time extension of temporal logic and the other is based on extended Hoare triples. Programs consist of concurrent processes with synchronous message passing. The maximal parallelism model is extended to multiprogramming.Springer Book ArchivesDE