%T Hard and Soft Priority in CSP
%A Adrian E. Lawrence
%E Barry M. Cook
%B Proceedings of WoTUG\-22: Architectures, Languages and Techniques for Concurrent Systems
%X Parallel systems which include priority can experience
conflicts when two concurrent processes assign different
priorities to the same actions. There are at least two ways
to resolve the difficulty: one is to halt; the other is to
declare a draw and allocate all the offending actions the
same priority. In CSPP these are called respectively hard
and soft priority. Originally CSPP included only hard
priority. Here we extend the language to include soft
priority as well. The Acceptances semantics which is used to
define CSPP does not require modification: it captures both
soft and hard behaviours.
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