Abstract
Session types denote message protocols between concurrent processes, allowing a type-safe expression of inter-process communication. Although previous work demonstrate a well-defined notion of subtyping where processes have different perceptions of the protocol, these formulations were limited to linear session types where each channel of communication has a unique provider and client. In this paper, we extend subtyping to shared session types where channels can now have multiple clients instead of a single client. We demonstrate that this generalization can statically capture protocol requirements that span multiple phases of interactions of a client with a shared service provider, something not possible in prior proposals. Moreover, the phases are manifest in the type of the client.
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Notes
- 1.
We do not consider termination to more easily align with later examples.
- 2.
The currently unnecessary unary choice will be useful later.
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We would like to thank the anonymous reviewers for feedback on the initially submitted version of this paper.
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Sano, C., Balzer, S., Pfenning, F. (2021). Manifestly Phased Communication via Shared Session Types. In: Damiani, F., Dardha, O. (eds) Coordination Models and Languages. COORDINATION 2021. Lecture Notes in Computer Science(), vol 12717. Springer, Cham. https://doi.org/10.1007/978-3-030-78142-2_2
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