Safe Asynchronous Mixed-Choice for Timed Interactions - Coordination Models and Languages Access content directly
Conference Papers Year : 2023

Safe Asynchronous Mixed-Choice for Timed Interactions

Jonah Pears
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Laura Bocchi
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Andy King
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Abstract

Mixed-choice has long been barred from models of asynchronous communication since it compromises key properties of communicating finite-state machines. Session types inherit this restriction, which precludes them from fully modelling timeouts – a key programming feature to handle failures. To address this deficiency, we present (binary) TimeOut Asynchronous Session Types (TOAST) as an extension to (binary) asynchronous timed session types to permit mixed-choice. TOAST deploy timing constraints to regulate the use of mixed-choice so as to preserve communication safety. We provide a new behavioural semantics for TOAST which guarantees progress in the presence of mixed-choice. Building upon TOAST, we provide a calculus featuring process timers which is capable of modelling timeouts using a $$\mathtt {receive\text {-}after}$$receive-after pattern, much like Erlang, and informally illustrate the correspondence with TOAST specifications.
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hal-04673820 , version 1 (20-08-2024)

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Jonah Pears, Laura Bocchi, Andy King. Safe Asynchronous Mixed-Choice for Timed Interactions. 25th International Conference on Coordination Languages and Models (COORDINATION), Jun 2023, Lisbon, Portugal. pp.214-231, ⟨10.1007/978-3-031-35361-1_12⟩. ⟨hal-04673820⟩
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