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Wait-free consensus in "in-phase" multiprocessor systems

Papatriantafilou, Marina and Tsigas, Philippas

July 1995, 12 pages.

Status: available - back from printing

In the {\em consensus} problem in a system with $n$ processes, each process starts with a private input value and runs until it chooses irrevocably a decision value, which was the input value of some process of the system; moreover, all processes have to decide on the same value. This work deals with the problem of {\em wait-free} ---fully resilient to processor crash and napping failures--- consensus of $n$ processes in an ``in-phase" multiprocessor system. It proves the existence of a solution to the problem in this system by presenting a protocol which ensures that a process will reach decision within at most $n(n-3)/2 +3$ steps of its own in the worst case, or within $n$ steps if no process fails.

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  AUTHOR = {Papatriantafilou, Marina and Tsigas, Philippas},
  TITLE = {Wait-free consensus in "in-phase" multiprocessor systems},
  TYPE = {Research Report},
  INSTITUTION = {Max-Planck-Institut f{\"u}r Informatik},
  ADDRESS = {Im Stadtwald, D-66123 Saarbr{\"u}cken, Germany},
  NUMBER = {MPI-I-95-1-016},
  MONTH = {July},
  YEAR = {1995},
  ISSN = {0946-011X},