Asynchronous communication on Occam

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Abstract
In this paper primitives for asynchronous process communication are defined and added to the programming language Occam. Most of the existing concurrent programming concepts have synchronization mechanisms built-in the communication primitives degrading process independency and restricting the parallelism they are trying to provide. Asynchronous process communication provides more freedom in programming concurrent systems allowing non-blocking semantics for both send and receive primitives. Messages are buffered and a number of operations over buffered but not yet received messages are defined, allowing programmer to set or dynamically change the communication discipline needed for the particular application. The goal of the work presented is to relax strict process communication discipline and to make Occam more convenient for expressing concurrency needed for real-time applications. Although Occam is based on the synchronous communication model, its low level facilities provide a possibility to create the semantics of concurrency completely different from the one initially offered.

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