Paper Details

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%T A Unifying Theory of True Concurrency Based on CSP and Lazy Observation
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%A Marc L. Smith
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%E Jan F. Broenink, Herman Roebbers, Johan P. E. Sunter, Peter H. Welch, David C. Wood
%B Communicating Process Architectures 2005
%X What if the CSP observer were lazy? This paper considers the
   consequences of altering the behavior of the CSP observer.
   Specifically, what implications would this new behavior have
   on CSP&\[sh]8217;s traces? Laziness turns out to be a
   useful metaphor. We show how laziness permits transforming
   CSP into a model of true concurrency (i.e., non\-interleaved
   trace semantics). Furthermore, the notion of a lazy observer
   supports tenets of view\-centric reasoning (VCR): parallel
   events (i.e., true concurrency), multiple observers (i.e.,
   different views), and the possibility of imperfect
   observation. We know from the study of programming languages
   that laziness is not necessarily a negative quality; it
   provides the possibility of greater expression and power in
   the programswe write. Similarly, within the context of the
   Unifying Theories of Programming, a model of true
   concurrency&\[sh]8212; VCR &\[sh]8212; becomes
   possible by permitting (even encouraging) the CSP observer
   to be lazy.

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