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A Timeless Model for the Verification of Quasi-Periodic Distributed Systems Maryam Dabaghchian Zvonimir Rakamari School of Computing University of Utah Motivating Example Safety property: speed is always in a valid range Liveness property:

  1. A Timeless Model for the Verification of Quasi-Periodic Distributed Systems Maryam Dabaghchian Zvonimir Rakamarić School of Computing University of Utah

  2. Motivating Example Safety property: speed is always in a valid range Liveness property: speed eventually becomes zero if the operator sends stop command 2

  3. Model Using State Machines These systems are usually verified using model checking s: program state (variables’ valuation) t: clock value Delay transition Discrete transition s,t s,t’ s,t s’,t Continuous time progress Discrete time progress Timeless model: Eliminate the time notion; and so the delay transitions • Allows checking of safety properties • Not suitable for checking of liveness properties • Source of fairness violation: processes that need at least • zero messages in their buffers to get enabled 3

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