%T Implementing Generalised Alt
%A Gavin Lowe
%E Peter H. Welch, Adam T. Sampson, Jan Bækgaard Pedersen, Jon Kerridge, Jan F. Broenink, Frederick R. M. Barnes
%B Communicating Process Architectures 2011
%X In this paper we describe the design and implementation of
a generalised alt operator for the Communicating Scala
Objects library. The alt operator provides a choice between
communications on different channels. Our generalisation
removes previous restrictions on the use of alts that
prevented both ends of a channel from being used in an
alt. The cost of the generalisation is a much more difficult
implementation, but one that still gives very acceptable
performance. In order to support the design, and greatly
increase our confidence in its correctness, we build CSP
models corresponding to our design, and use the FDR model
checker to analyse them.
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