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Support for this work was provided by ARPA under Fort Huachuca contract ARMY DABT63-94-C-0029 and by the National Science Foundation under grants CCR-9023256 and STI-9413532.

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Joydip Kundu is currently employed by Digital Equipment Corporation, Nashua, NH.

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The actual event names that Ariadne currently uses are much less readable and they have been changed for clarity purposes throughout this paper.

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The WRT clause in each of these patterns would actually have to specify the set {MERGE,NOMERGE,BEGINBARRIER,ENDBARRIER} but we omit this detail throughout the paper to make the examples more readable. We continue to work on improving the usability of Ariadne's interface.

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In the current prototype, Ariadne does not function as Sneezy client for performance reasons; we are investigating this aspect of the design further.

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The current system works even if barriers are not program-wide, but there is no support for discovering the process set to which a partial barrier applies.