LSV Seminar

The LSV seminar takes place on Tuesday at 11:00 AM. The usual location is the conference room at Pavillon des Jardins (venue). If you wish to be informed by e-mail about upcoming seminars, please contact Stéphane Le Roux and Matthias Fuegger.

The seminar is open to public and does not require any form of registration.

Past Seminars

Local Testing of Message Sequence Charts is Difficult

Tuesday, May 22 2007 at 11:00AM
Salle de Conférence (Pavillon des Jardins)
Madhavan Mukund (Chennai Mathematical Institute, India)

We consider message sequence charts enriched with timing constraints between pairs of events. As in the untimed setting, an infinite family of time-constrained message sequence charts (TC-MSCs) is generated using an HMSC?a finite-state automaton whose nodes are labelled by TC-MSCs.

A timed MSC is an MSC in which each event is assigned an explicit time-stamp. A timed MSC covers a TC-MSC if it satisfies all the time constraints of the TC-MSC. A natural recognizer for timed MSCs is a message-passing automaton (MPA) augmented with clocks.

The question we address is the following: given a timed system specified as a time-constrained HMSC H and an implementation in the form of a timed MPA A, is every TC-MSC generated by H covered by some timed MSC recognized by A?

We give a complete solution for locally synchronized time-constrained HMSCs, whose underlying behaviour is always regular. We also describe a restricted solution for the general case.

This is joint work with S Akshay and K Narayan Kumar.

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