By Sylvain Boulmé (auth.), Jean-Raymond Abrial, Uwe Glässer (eds.)
This Festschrift quantity, released in honor of Egon Börger, includes 14 papers from a Dagstuhl Seminar, which was once prepared as a "Festkolloquium" at the party of his sixtieth birthday in might 2006. concentrating on utilized formal equipment, the amount covers a variety of utilized study, spanning from theoretical and methodological foundations to functional functions of summary kingdom Machines, B, and past, emphasizing common equipment and instruments that, despite their applicational orientation, are nonetheless dedicated to definitely the right of mathematical rigor.
In specific, the papers handle the next significant subject matters: methodological foundations of necessities specification and verification, characterization of specification languages and their logical foundations, complicated device environments and systematic integration of instruments, computer assisted validation and verification, dispensed algorithms and concurrent protocols, novel functions in public defense, safety and privateness, business case reviews and event experiences, and the function of formal equipment in computing device technological know-how education.
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Extra resources for Rigorous Methods for Software Construction and Analysis: Essays Dedicated to Egon Börger on the Occasion of His 60th Birthday
Example text
We Designing Old and New Distributed Algorithms 31 do not give the complete set of events of the last models but note that the localisation is systematic, as long as information of each node contain localisable information. 6 Conclusion and Future Work The current work is a general presentation of work on the leader election problem in a distributed environment. We have used the development of the classical leader election protocol of the IEEE 1394 and we propose an improvement of the classical solution.
We have now two new events for managing contention: contention3 discovers the contention and solve contention3 solves the contention. A contention channel called c is used to control the contention status. x→y ∈ m−t y ∈ dom (m) contention3 = any x, y where x → y ∈ m − (t ∪ c) ∧ y ∈ dom (m) then c := c ∪ {x → y} end solve contention3 = any x, y where x∈N ∧ y∈N ∧ c = {x → y, y → x} then m := m − c c := ∅ end In the new invariant, if x has sent a message to y and if y has sent a message y ∈ dom (m), then y has sent its message to x (no other choice) and this message was not yet confirmed (y → x ∈ m − t).
C Springer-Verlag Berlin Heidelberg 2009 18 D. Cansell and D. M´ery distributed algorithms: the resulting algorithm does not exist. Abstract models of the previous development express a context that leads us to the emergence of a simple idea using refinement and a tool which yields a new correct solution by construction. Our methodology uses the event B method and the Click’n’Prove tool [2], which together become a true laboratory for replaying developments. The case study is the IEEE 1394 leader election protocol [3] in an acyclic graph.