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A theory of communicating sequential processes-英文文献.pdf

A theory of communicating sequential processes-英文文献.pdf

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A theory of communicating sequential processes-英文文献

A Theory of CommunicatingSequential Processes S. D. BROOKES Carnegw-Mellon Umversity,Pittsburgh,Pennsylvania AND C. A. R. HOARE AND A. W. ROSCOE Oxford UmversttyProgrammmgResearch Group, Oxford,England Abstract. A mathematical model for communicating sequential processesis given, and a number of its interestingand usefulproperties are stated and proved. The possibilitiesof nondetermimsm are fully taken into account. Categories and Subject Descriptors: D.3.1 [ProgrammingLanguages]: Formal Definitions and The- ory--semantics; syntar, D.3.2 [ProgrammingLanguages]: Language Classifications;D.3.3 [Program- ming Languages]: LanguageConstructs--concurrentprogramming structures; F.3.2 [Logics and Mean- ings of Programs]: Semanticsof ProgrammingLanguages--denotattonalsemantics General Terms: Theory Additional Key Words and Phrases: Communicating sequential processes, synchrony, asynchrony, nondeterminism, parallehsm, deadlock, safety,liveness 1. Introduction In the last decade there has been a remarkable growth in general understanding of the design and definition of computer programming languages. This understanding has been based upon a recognition that the text of each program expressed in the language should be given a mathematically defined meaning or denotation, in the same way as any other notational system of logic or mathematics. For a conven- tional sequential programming language, the simplest mathematical domain suit- able for this purpose is the space of partial functions that maps from an abstract machine state before execution of a c o m m a n d to the state of the machine afterward. For a programming language with jumps, the appropriate mathematical domain is slightly more complicated, involvin

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