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Paper Details

%T Focussing on Traces to Link VCR and CSP
%A Marc L. Smith
%E Ian R. East, David Duce, Mark Green, Jeremy M. R. Martin, Peter H. Welch
%B Communicating Process Architectures 2004
%X View\-Centric Reasoning (VCR) replaces CSP\[rs]s perfect
   observer with multiple, possibly imperfect observers. To
   employ view\-centric reasoning within existing CSP models
   requires a bookkeeping change. Specifically, VCR introduces
   parallel events as a new primitive for constructing traces,
   and distinguishes two types of event traces: histories and
   views. Previously, we gave the operational semantics of VCR,
   and demonstrated the utility of parallel event traces to
   reason for the first time unambiguously about the meaning of
   the Linda predicate operations rdp() and inp(). The choice
   of using an operational semantics to describe VCR makes
   direct comparison with CSP difficult; therefore, work is
   ongoing to recast VCR denotationally, then link it with the
   other CSP models within Hoare and He\[rs]s Unifying Theories
   of Programming. Initial efforts in this direction led to a
   comparison of VCR with Lawrence\[rs]s HCSP. In this paper,
   we present some recent insights and abstractions \- inspired
   by modern quantum physics \- that have emerged whilst
   contemplating parallel event traces in light of the unifying
   theories. These insights lead to a more natural expression
   of VCR traces, in the sense that they more closely resemble
   CSP traces, thus forming a basis for linking VCR and CSP.

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