The power of priority channel systems

  • Authors:
  • Christoph Haase;Sylvain Schmitz;Philippe Schnoebelen

  • Affiliations:
  • LSV, ENS Cachan & CNRS, France;LSV, ENS Cachan & CNRS, France;LSV, ENS Cachan & CNRS, France

  • Venue:
  • CONCUR'13 Proceedings of the 24th international conference on Concurrency Theory
  • Year:
  • 2013

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Abstract

We introduce Priority Channel Systems, a new natural class of channel systems where messages carry a numeric priority and where higher-priority messages can supersede lower-priority messages preceding them in the fifo communication buffers. The decidability of safety and inevitability properties is shown via the introduction of a priority embedding, a well-quasi-ordering that has not previously been used in well-structured systems. We then show how Priority Channel Systems can compute Fast-Growing functions and prove that the aforementioned verification problems are F ε0-complete.