Technical Report CS0633

TR#:CS0633
Class:CS
Title: VERIFICATION OF 'DISTRIBUTED PROGRAMS ~SING REPRESENTATIVE INTERLEAVING SEQUENCES
Authors: Snmuel Katz and Doron Peled
PDFCS0633.pdf
Abstract: We present a formal proof method based on a partial order semantics for parallel and distributed programs. In this view, a program's semantics is given by a collection of partial orders of the events which can occur during execution. Rather than using the partial orders directly, the basis of the method assumes the sets of interleaving sequences with global states that are consistent with each partial order (each such set is called an interleaving set). The proof rules allow concluding the correctness of certain classes of properties for all interleaving sequences, even though the property is only demonstrated directly for a subset of the sequences. The subset used must include a representative sequence from each interleaving set, and the proof rules guarantee that this is the case when they may be applied. The method employs proof lattices, and is expressed using the temporal logic ISTL*. By choosing a subset with appropriate sequences, simpler intennediate assertions can be used than in previous fonnal approaches.
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