Computer Laboratory

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Global/local subtyping for a distributed π-calculus

Peter Sewell

August 1997, 57 pages


In the design of mobile agent programming languages there is a tension between the implementation cost and the expressiveness of the communication mechanisms provided. This paper gives a static type system for a distributed π-calculus in which the input and output of channels may be either global or local. This allows compile-time optimization where possible but retains the expressiveness of channel communication. Subtyping allows all communications to be invoked uniformly. Recursive types and products are included. The distributed π-calculus used integrates location and migration primitives from the Distributed Join Calculus with asynchronous π communication, taking a simple reduction semantics. Some alternative calculi are discussed.

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BibTeX record

  author =	 {Sewell, Peter},
  title = 	 {{Global/local subtyping for a distributed $\pi$-calculus}},
  year = 	 1997,
  month = 	 aug,
  url = 	 {},
  institution =  {University of Cambridge, Computer Laboratory},
  number = 	 {UCAM-CL-TR-435}