Open Bisimulation for the Concurrent Constraint Pi-Calculus

Abstract. The concurrent constraint pi-calculus (cc-pi-calculus) has been introduced as a model for concluding Service Level Agreements. The cc-pi calculus combines the synchronous communication paradigm of process calculi with the constraint handling mechanism of concurrent constraint programming. While in the original presentation of the calculus a reduction semantics has been proposed, in this work we investigate the abstract semantics of cc-pi processes. First, we define a labelled transition system of the calculus and a notion of open bisimilarity `a la pi-calculus that is proved to be a congruence. Next, we give a symbolic characterisation of bisimulation and we prove that the two semantics coincide. Essentially, two processes are open bisimilar if they have the same stores of constraints - this can be statically checked - and if their moves can be mutually simulated. A key idea of the symbolic transition system is to have `contextual' labels, i.e. labels specifying that a p...

• Type: Conference
• Year: 2008
• Where: ESOP
• Authors: Maria Grazia Buscemi, Ugo Montanari
• Keywords: Calculus, Concurrent Constraint, Concurrent Constraint Pi-calculus, ESOP 2008, Programming Languages