Conflation confers concurrency

Atkey, Robert and Lindley, Sam and Morris, J. Garrett; Lindley, Sam and McBride, Conor and Trinder, Phil and Sannella, Don, eds. (2016) Conflation confers concurrency. In: A List of Successes That Can Change the World. Lecture Notes in Computer Science, 9600 . Springer, pp. 32-55. ISBN 9783319309354 (

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Session types provide a static guarantee that concurrent programs respect communication protocols. Recent work has explored a correspondence between proof rules and cut reduction in linear logic and typing and evaluation of process calculi. This paper considers two approaches to extend logically-founded process calculi. First, we consider extensions of the process calculus to more closely resemble π-calculus. Second, inspired by denotational models of process calculi, we consider conflating dual types. Most interestingly, we observe that these approaches coincide: conflating the multiplicatives (⊗ and 
⅋) allows processes to share multiple channels; conflating the additives (⊕ and &) provides nondeterminism; and conflating the exponentials (! and ?) yields access points, a rendezvous mechanism for initiating session typed communication. Access points are particularly expressive: for example, they are sufficient to encode concurrent state and general recursion.