Automatic
Addition of Fault-Tolerance in the Presense of Unchangeable
Environment Actions TLE
We focus on the
problem of adding fault-tolerance to an existing concurrent protocol in the
presence of unchangeable environment actions. Such unchangeable actions occur
in cases where
a subset of components/processes cannot be modified since they represent
third-party components or are constrained by
physical laws. These actions differ from faults in that they are
(1) simultaneously
collaborative and disruptive, (2) essential for satisfying the specification,
and (3) possibly non-terminating. Hence, if
these actions are modeled as faults while adding fault-tolerance, it causes
existing model repair algorithms to declare failure to add fault-tolerance. We
present a set of algorithms for
adding stabilization and fault-tolerance for programs that run in presence of environment actions. We prove the
soundness, completeness, and the complexity of our algorithms. We have implemented
all of our algorithms using symbolic techniques in Java. The experimental results
of our algorithms for various examples are also provided.
Paper:
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