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* Corresponding author 1 DIT-UPPSALA - Department of Information Technology 2 LSV - Laboratoire Spécification et Vérification Cachan 3 MEXICO - Modeling and Exploitation of Interaction and Concurrency LSV - Laboratoire Spécification et Vérification Cachan, ENS Cachan - École normale supérieure - Cachan, Inria Saclay - Ile de France, CNRS - Centre National de la Recherche Scientifique : UMR8643 4 Chennai Mathematical Institute Inde

Abstract : Multi-pushdowns communicating via queues are formal models of multi-threaded programs communicating via channels. They are turing powerful and much of the work on their verification has focussed on under-approximation techniques. Any error detected in the under-approximation implies an error in the system. However the successful verification of the under-approximation is not as useful if the system exhibits unverified behaviours. Our aim is to design controllers that observe-restrict the system so that it stays within the verified under-approximation. We identify some important properties that a good con- troller should satisfy. We consider an extensive under-approximation class, construct a distributed controller with the desired properties and also establish the decidability of verification problems for this class.

Keywords : Verification Distributed controller Message sequence charts Multi-pushdown systems

Autor: Cyriac Aiswarya - Paul Gastin - K. Narayan Kumar -



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