Concurrency Theory: Calculi an Automata for Modelling by Howard Bowman

By Howard Bowman

The ebook provides an intensive creation to LOTOS highlighting how the strategy differs from competitor recommendations akin to CCS and CSP. The notation is illustrated via a few operating examples and through the use of the LOTOS approach calculus a spectrum of semantic versions for concurrent structures are reviewed. particularly, linear-time semantics; in keeping with strains; 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 ways the untimed semantic types – strains, labelled transition structures, refusals and occasion buildings – will be generalised to the timed atmosphere. The authors additionally generalise the straightforward speaking automata notation to yield timed automata with multi-way synchronisation utilizing model-checking verification equipment and new thoughts to avoid time-locks from arising.

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

Sample text

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 presents example specifications written in pbLOTOS. 2 Example Specifications A simple communication protocol and the Dining Philosophers problem are used as running examples.

Observable actions can be transformed into i using a hiding operator, which takes the form: hide x1 , . . , xn in B and states that wherever any of the actions x1 , . . , xn arise during the evaluation of the behaviour B they will be replaced by i. Thus, the gates x1 , . . , 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.

Then, in Chapters 3, 4 and 5, we consider how this calculus can be interpreted semantically. In particular, we motivate the use of semantic models in concurrency theory in Chapter 3. Then, in the same chapter, we consider two simple semantic theories: (linear time) trace semantics and (branching time) labelled transition system semantics. Contrasting semantic theories are considered in Chapters 4, where we discuss true concurrency semantics, and 5, where we focus on testing theories. g. process calculi [96, 148],1 temporal logics [136], Petri Nets [169] and extended finite state machines [105].

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