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Multi-Writer Composite Registers James H. Andersony

Summary: Multi-Writer Composite Registers
James H. Andersony
Department of Computer Science
University of North Carolina at Chapel Hill
Chapel Hill, NC 27599-3175
July 1989
Revised March 1991, December 1992, August 1993
A composite register is an array-like shared data object that is partitioned into a number of compo-
nents. An operation of such a register either writes a value to a single component, or reads the values
of all components. A composite register reduces to an ordinary atomic register when there is only one
component. In this paper, we show that a composite register with multiple writers per component can
be implemented in a wait-free manner from a composite register with a single writer per component. It
has been previously shown that registers of the latter kind can be implemented from atomic registers
without waiting. Thus, our results establish that any composite register can be implemented in a wait-
free manner from atomic registers. We show that our construction has comparable space complexity and
better time complexity than other constructions that have been presented in the literature.
Keywords: atomicity, atomic register, composite register, concurrency, interleaving semantics, lineariz-
ability, shared variable, snapshot
CR Categories: D.4.1, D.4.2, F.3.1


Source: Anderson, James - Department of Computer Science, University of North Carolina at Chapel Hill


Collections: Computer Technologies and Information Sciences