Paper Details

%T Semantics of prialt in Handel\-C (tm)
%A Andrew Butterfield
%E James S. Pascoe, Roger J. Loader, Vaidy S. Sunderam
%B Communicating Process Architectures 2002
%X This paper discusses the semantics of the prialt construct
   in Handel\-C. The language is essentially a static subset of
   C, augmented with a parallel construct and channel
   communication, as found in CSP. All assignments and channel
   communication events take one clock cycle, with all updates
   synchronised with the clock edge marking the cycle end. The
   behaviour of prialt in Handel\-C is similar in concept to
   that of occam, and to the p\-priority concept of Adrian
   Lawrence\[rs]s CSPP. However, we have to contend with both
   input and output guards in Handel\-C, unlike the situation
   in occam, although prialts with conflicting priority
   requirements are not legal in Handel\-C. This makes our
   problem simpler than the more general case including such
   conflicts considered by Lawrence. We start with an informal
   discussion of the issues that arise when considering the
   semantics of Handel\-C\[rs]s prialt construct. We define a
   resolution function (R) that determines which requests in a
   collection of prialts become active. We describe a few
   properties that we expect to hold for resolution, and
   discuss the issue of compositionality.

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