Toward a grainless semantics for shared-variable concurrency

  • Authors:
  • John C. Reynolds

  • Affiliations:
  • Carnegie Mellon University and Edinburgh University

  • Venue:
  • FSTTCS'04 Proceedings of the 24th international conference on Foundations of Software Technology and Theoretical Computer Science
  • Year:
  • 2004

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Abstract

Conventional semantics for shared-variable concurrency suffers from the “grain of time” problem, i.e., the necessity of specifying a default level of atomicity. We propose a semantics that avoids any such choice by regarding all interference that is not controlled by explicit critical regions as catastrophic. It is based on three principles: Operations have duration and can overlap one another during execution. If two overlapping operations touch the same location, the meaning of the program execution is “wrong”. If, from a given starting state, execution of a program can give “wrong”, then no other possibilities need be considered.