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Type-checking Liveness for Collaborative Processes with Bounded and Unbounded Recursion

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We present the first session typing system guaranteeing request-response liveness properties for possibly non-terminating communicating processes. The types augment the branch and select types of the standard binary session types with a set of required responses, indicating that whenever a particular label is selected, a set of other labels, its responses, must eventually also be selected. We prove that these extended types are strictly more expressive than standard session types. We provide a type system for a process calculus similar to a subset of collaborative BPMN processes with internal (data-based) and external (event-based) branching, message passing, bounded and unbounded looping. We prove that this type system is sound, i.e., it guarantees request-response liveness for dead-lock free processes. We exemplify the use of the calculus and type system on a concrete example of an infinite state system.
Original languageEnglish
JournalLogical Methods in Computer Science
Volume12
Issue number1
Pages (from-to)1-38
Number of pages38
ISSN1860-5974
DOIs
Publication statusPublished - 11 Feb 2016

ID: 80629785