Parameterized verification of asynchronous shared-memory systems

  • Authors:
  • Javier Esparza;Pierre Ganty;Rupak Majumdar

  • Affiliations:
  • TU Munich, Germany;IMDEA Software Institute, Spain;MPI-SWS, Germany

  • Venue:
  • CAV'13 Proceedings of the 25th international conference on Computer Aided Verification
  • Year:
  • 2013

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Abstract

We characterize the complexity of the safety verification problem for parameterized systems consisting of a leader process and arbitrarily many anonymous and identical contributors. Processes communicate through a shared, bounded-value register. While each operation on the register is atomic, there is no synchronization primitive to execute a sequence of operations atomically. We analyze the complexity of the safety verification problem when processes are modeled by finite-state machines, pushdown machines, and Turing machines. The problem is coNP-complete when all processes are finite-state machines, and is PSPACE-complete when they are pushdown machines. The complexity remains coNP-complete when each Turing machine is allowed boundedly many interactions with the register. Our proofs use combinatorial characterizations of computations in the model, and in case of pushdown-systems, some language-theoretic constructions of independent interest.