Paper Details

PICOMS: Prioritised Inferred Choice Over Multiway Synchronisation

Authors: Warren, Douglas N.

Abstract:

The ability to make a choice over multiway synchronisations (COMS) has always been an integral part of CSP. However, it is something that has been conspicuous by its absence from many concurrent languages, limiting their expressive power. Implementation of a 2-phase commit protocol to resolve such choice can result in large overheads, caused by synchronisation offers having to be withdrawn. The recent Oracle (single-phase) algorithm resolves COMS efficiently, for shared memory concurrency at least. However, the Oracle only deals with arbitrary choice and does not obviously extend to prioritised choice (where we assume the priorities of the participating processes are not in conflict). PICOMS is a proposed efficient method for resolving COMS that honours non-conflicting priorities, with only a modest increase in complexity over the Oracle method.

Proceedings:

Communicating Process Architectures 2008, Peter H. Welch, S. Stepney, F.A.C Polack, Frederick R. M. Barnes, Alistair A. McEwan, G. S. Stiles, Jan F. Broenink, Adam T. Sampson, 2008, pp - published by IOS Press, Amsterdam

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