Abstract

The research on algorithmic verification methods for concurrent and parallel systems has mostly focussed on finite-state systems, with applications in e.g. communication protocols and hardware systems. For infinite-state systems, e.g. systems that operate on data from unbounded domains, algorithmic verification is more difficult, since most verification problems are in general undecidable. In this paper, we consider the verification of a particular class of infinite-state systems, namely systems consisting of finite-state processes that communicate via unbounded lossy FIFO channels. This class is able to model e.g. link protocols such as the Alternating Bit Protocol and HDLC. The unboundedness of the channels makes these systems infinite-state. For this class of systems, we show that several interesting verification problems are decidable by giving algorithms for verifying the following classes of properties.

Citations