2026-08-10T23:43:25Z https://drops.dagstuhl.de/oai

oai:drops-oai.dagstuhl.de:17098 2024-03-06T10:58:45Z ddc:004 open_access

Generalised Multiparty Session Types with Crash-Stop Failures Barwell, Adam D. Scalas, Alceste Yoshida, Nobuko Zhou, Fangyi Session Types Concurrency Failure Handling Model Checking Session types enable the specification and verification of communicating systems. However, their theory often assumes that processes never fail. To address this limitation, we present a generalised multiparty session type (MPST) theory with crash-stop failures, where processes can crash arbitrarily. Our new theory validates more protocols and processes w.r.t. previous work. We apply minimal syntactic changes to standard session π-calculus and types: we model crashes and their handling semantically, with a generalised MPST typing system parametric on a behavioural safety property. We cover the spectrum between fully reliable and fully unreliable sessions, via optional reliability assumptions, and prove type safety and protocol conformance in the presence of crash-stop failures. Introducing crash-stop failures has non-trivial consequences: writing correct processes that handle all crash scenarios can be difficult. Yet, our generalised MPST theory allows us to tame this complexity, via model checking, to validate whether a multiparty session satisfies desired behavioural properties, e.g. deadlock-freedom or liveness, even in presence of crashes. We implement our approach using the mCRL2 model checker, and evaluate it with examples extended from the literature. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Adam D. Barwell and Alceste Scalas and Nobuko Yoshida and Fangyi Zhou 2022 Is Part Of LIPIcs, Volume 243, 33rd International Conference on Concurrency Theory (CONCUR 2022) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.CONCUR.2022.35 urn:nbn:de:0030-drops-170982 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2022.35 eng https://creativecommons.org/licenses/by/4.0/legalcode