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arXiv · 1901.09606

Verifying Asynchronous Interactions via Communicating Session Automata

Julien Lange·Nobuko Yoshida
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Abstract

This paper proposes a sound procedure to verify properties of communicating session automata (CSA), i.e., communicating automata that include multiparty session types. We introduce a new asynchronous compatibility property for CSA, called k-multiparty compatibility (k-MC), which is a strict superset of the synchronous multiparty compatibility used in theories and tools based on session types. It is decomposed into two bounded properties: (i) a condition called k-safety which guarantees that, within the bound, all sent messages can be received and each automaton can make a move; and (ii) a condition called k-exhaustivity which guarantees that all k-reachable send actions can be fired within the bound. We show that k-exhaustivity implies existential boundedness, and soundly and completely characterises systems where each automaton behaves equivalently under bounds greater than or equal to k. We show that checking k-MC is PSPACE-complete, and demonstrate its performance empirically over large systems using partial order reduction.

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Julien Lange, Nobuko Yoshida. 2019-01-28. Verifying Asynchronous Interactions via Communicating Session Automata. https://arxiv.org/abs/1901.09606

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