Download Formal Techniques for Distributed Systems: Joint 11th IFIP by David Lee, Antonia Lopes, Arnd Poetzsch-Heffter PDF

By David Lee, Antonia Lopes, Arnd Poetzsch-Heffter

This publication constitutes the refereed lawsuits of the eleventh IFIP WG 6.1 overseas convention on Formal tools for Open Object-Based disbursed platforms, FMOODS 2009, and twenty ninth IFIP WG 6.1 Formal strategies for Networked and dispensed platforms, strong point 2009, held in Lisboa, Portugal, in June 2009. The 12 revised complete papers awarded including 6 brief papers have been conscientiously reviewed and chosen from forty two submissions. The papers hide subject matters corresponding to formal verification, algorithms and implementations, modeling and checking out, procedure algebra and calculus in addition to research of dispensed structures.

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Extra info for Formal Techniques for Distributed Systems: Joint 11th IFIP WG 6.1 International Conference FMOODS 2009 and 29th IFIP WG 6.1 International Conference FORTE ... Programming and Software Engineering)

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2. Time line with overlapping regions of different activations of a Within operator critical mode the framework stops the process execution, so that the cause of the violation can be dealt with immediately. The evaluation of formulae of the form Until (φ1 , φ2 ) could lead to an unbounded number of duplications. Indeed, every time the corresponding automaton is activated, it checks if φ2 holds. If it does, the automaton terminates in the true state. If both φ1 and φ2 do not hold, it terminates in the false state.

ALBERT’s Semantics Automata are defined as follows. Definition 1. An ASA is a tuple (Σ, Q, CK , q0 , δ, F ) where Σ is a finite alphabet, Q is a set of states, CK is a finite set of time counters bounded in value by a positive integer K, q0 ∈ Q is the initial state, δ : Q × ℘(Σ) × Q+ × ΨCK → B + (Q × ΥCK ) is the transition function and F ⊆ Q is a set of accepting states. For the sake of readability, when indicating the elements in B + (Q × ΥCK ) we will use the symbol / to separate the component in Q from the component in ΥCK .

Using more compact representations). The approximated method we propose in this paper works on constraints of a special form, called simple context-sensitive constraints. In a simple contextsensitive constraint we use a single subset of states, called the padding set, to over-approximate the constraints on processes in each context. For this new symbolic representation, we have the following properties.

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