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Paper Details

%T Adding Formal Verification to occam\-π
%A Peter H. Welch, Jan Bækgaard Pedersen, Frederick R. M. Barnes, Carl G. Ritson, Neil C.C. Brown
%E Peter H. Welch, Adam T. Sampson, Jan Bækgaard Pedersen, Jon Kerridge, Jan F. Broenink, Frederick R. M. Barnes
%B Communicating Process Architectures 2011
%X This is a proposal for the formal verification of
   occam\-π programs to be managed entirely within
   occam\-π. The language is extended with qualifiers on
   types and processes (to indicate relevance for verification
   and/or execution) and assertions about refinement (including
   deadlock, livelock and determinism). The compiler abstracts
   a set of CSPm equations and assertions, delegates their
   analysis to the FDR2 model checker and reports back in terms
   related to the occam\-π source. The rules for mapping
   the extended occam\-π to CSPm are given. The full
   range of CSPm assertions is accessible, with no knowledge
   of CSP formalism required by the occam\-π programmer.
    Programs are proved just by <em>writing</em>
   and <em>compiling</em> programs. A case\-study
   analysing a new (and elegant) solution to the
   <em>Dining Philosophers</em> problem is
   presented. Deadlock\-freedom for colleges with
   <em>any</em> number of philosphers is
   established by verifying an induction argument (the base
   and induction steps). Finally, following guidelines laid
   down by Roscoe, the careful use of <em>model
   compression</em> is demonstrated to verify directly
   the deadlock\-freedom of an occam\-&pi; college with
   10^2000 philosphers (in around 30 seconds). All we need is a
   universe large enough to contain the computer on which to
   run it.

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