• David Bonnin
  • Corentin Travers
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 8304)


It is well known that in an asynchronous message-passing system, one can emulate an atomic register providing that more than half of the processes are non-faulty. By contrast, when a majority of the processes may fail, simulating atomic register is not possible. This paper investigates weak variants of atomic registers that can be simulated tolerating a majority of processes failures. Specifically, the paper introduces a new class of registers, called α-register and shows how to emulate them.

For atomic registers, a read operation returns the last written value when there is no concurrent write operations. α-registers generalize atomic registers in the following sense: In any interval I, at most α values written before I are returned by the read operations in I. A simulation of an α-register tolerating f failures in a n-processes system is presented for α = 2M − 1, where M =  max (1,2f − n + 2). The simulation is optimal up to a constant multiplicative factor: the paper establishes that α-registers cannot be simulated tolerating f failures if α ≤ M.


Message passing fault-tolerance shared-memory simulation 


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Copyright information

© Springer International Publishing Switzerland 2013

Authors and Affiliations

  • David Bonnin
    • 1
  • Corentin Travers
    • 1
  1. 1.LaBRI, University Bordeaux 1France

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