%T Extending CSP
%A Adrian E. Lawrence
%E Peter H. Welch, André W. P. Bakkers
%B Proceedings of WoTUG\-21: Architectures, Languages and Patterns for Parallel and Distributed Applications
%X CSP, timed or untimed, has not included a general treatment
of priority, although the PRI ALT constructor is an
essential part of occam. This paper introduces CSPP which
includes a generalization of PRI ALT in the form of a
prioritized external choice P <pribox> Q. PRI
PAR is also included. A new denotational semantics is
introduced, although only the simplest model is outlined.
The work is intended to provide a solid rogorous foundation
for hardware\-software codesign. And a companion paper
describes untimed HCSP which is a further extension of CSP
built upon these foundations. It was first presented
informally at the Twente WoTUG\-20 technical meeting.
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