%T Beyond Mobility \- What Next After CSP/pi?
%A Michael Goldsmith
%E Peter H. Welch, Herman Roebbers, Jan F. Broenink, Frederick R. M. Barnes, Carl G. Ritson, Adam T. Sampson, G. S. Stiles, Brian Vinter
%B Communicating Process Architectures 2009
%X Process algebras like CSP and CCS inspired the original
occam model of communication and process encapsulation.
Later the pi\-calculus and various treatments handling
mobility in CSP added support for mobility, as realised in
practical programming systems such as occam\-pi, JCSP, CHP
and Sufrin\[rs]s CSO, which allow a rather abstract notion
of motion of processes and channel ends between parents
or owners. Milner\[rs]s Space and Motion of Communicating
Agents on the other hand describes the bigraph framework,
which makes location more of a first\-class citizen of the
calculus and evolves through reaction rules which rewrite
both place and link graphs of matching sections of a system
state, allowing more dramatic dynamic reconfigurations of a
system than simple process spawning or migration. I consider
the tractability of the notation, and to what extent the
additional flexibility reflects or elicits
desirable programming paradigms.
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