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Download Concurrency Theory: Calculi an Automata for Modelling by Howard Bowman PDF

By Howard Bowman

The ebook provides an in depth advent to LOTOS highlighting how the procedure differs from competitor suggestions resembling CCS and CSP. The notation is illustrated by way of a couple of operating examples and by utilizing the LOTOS strategy calculus a spectrum of semantic versions for concurrent structures are reviewed. in particular, linear-time semantics; in keeping with lines; branching-time semantics; utilizing either labelled transition structures and refusals, are used to spotlight precise concurrency semantics utilizing occasion structures.

In addition to this an easy timed extension to LOTOS is brought utilizing working examples, permitting attention of the way the untimed semantic versions – lines, labelled transition structures, refusals and occasion constructions – will be generalised to the timed surroundings. The authors additionally generalise the easy speaking automata notation to yield timed automata with multi-way synchronisation utilizing model-checking verification equipment and new options to avoid time-locks from arising.

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Additional resources for Concurrency Theory: Calculi an Automata for Modelling Untimed and Timed Concurrent Systems

Example text

It is quite easy though to view the behavioural and data parts as distinct. In fact, here we are almost exclusively interested in the behavioural part. e. just the behavioural part). We also subdivide basic LOTOS, because the full behavioural language contains a lot of syntax that is somewhat cumbersome to carry around when looking at the theoretical properties of the language. Thus, our main point of focus is a subset of bLOTOS that we call primitive basic LOTOS (which we shorten to pbLOTOS). 2) introduces two specification examples that we use to illustrate formal description in LOTOS.

4 Mobility Axis In their primitive form, approaches which just describe the basic event ordering of systems assume a static configuration of components. Thus, for example, it is not possible to change communication paths between components (if component A does not communicate with component B at the start of the execution of the system, it never will), and it is not possible for components to physically change locations. Such mobility and dynamic reconfiguration, though, arises frequently in practice.

Xn are removed from the interface of behaviour B. e. hide timeout in B This hiding reflects the reality of networked communication, where, for example, the receiver process would be unable to observe a timer expiring in the sender. g. a , a , a1 , a2 , . . , to range over Act ∪ {i}. 28 2 Process Calculi: LOTOS Actions are the basic unit of LOTOS specification and, typically, when performing a formal description using LOTOS, a set of actions in the problem domain would be located. e. to define the “temporal order” in which actions can occur (after all this is what basic event ordering models are about).

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