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A model for syntactic control of interference

Published online by Cambridge University Press:  04 March 2009

P. W. O'Hearn
P. W. O'Hearn
Affiliation:
School of Computer and Information Science, Syracuse University, Syracuse, NY, USA 13224–4100
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Abstract

Two imperative programming language phrases interfere when one writes to a storage variable that the other reads from or writes to. Reynolds has described an elegant linguistic approach to controlling interference in which a refinement of typed λ-calculus is used to limit sharing of storage variables; in particular, different identifiers are required never to interfere. This paper examines semantic foundations of the approach.

We describe a category that has (an abstraction of) interference information built into all objects and maps. This information is used to define a ‘tensor’ product whose components are required never to interfere. Environments are defined using the tensor, and procedure types are obtained via a suitable adjunction. The category is a model of intuitionistic linear logic. Reynolds' concept of passive type - i.e. types for phrases that do not write to any storage variables - is shown to be closely related, in this model, to Girard's ‘of course’ modality.

Type
Research Article
Information
Mathematical Structures in Computer Science , Volume 3 , Issue 4 , December 1993 , pp. 435 - 465
Copyright
Copyright © Cambridge University Press 1993

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