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Deadlock-free Context-free Session Types

arXiv CS Monday 08 June 2026, 04:00 UTC By Andreia Mordido, Jorge A. P\'erez 1 min read
Key Points

arXiv:2506.20356v4 Announce Type: replace Abstract: We tackle the problem of statically ensuring that message-passing programs never run into deadlocks. We focus on concurrent functional programs governed by context-free session types, which can express rich tree-like structures not expressible in standard session types. We propose a new type system based on context-free session types: it enforces both protocol conformance and deadlock freedom, also for programs implementing cyclic...

arXiv:2506.20356v4 Announce Type: replace Abstract: We tackle the problem of statically ensuring that message-passing programs never run into deadlocks. We focus on concurrent functional programs governed by context-free session types, which can express rich tree-like structures not expressible in standard session types. We propose a new type system based on context-free session types: it enforces both protocol conformance and deadlock freedom, also for programs implementing cyclic communication topologies with recursion and polymorphism. We show how the priority-based approach to deadlock freedom can be extended to this expressive setting. We prove that well-typed concurrent programs respect their protocols and never deadlock.
Originally published by arXiv CS Read original →

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