Unamb

Revision as of 16:11, 19 November 2008 by Conal (Talk | contribs)

Abstract

unamb is a package containing the unambiguous choice operator

unamb

, which wraps thread racing up in a purely functional, semantically simple wrapper. Given any two arguments

u

and

v

that agree unless bottom, the value of

unamb u v

is the more terminating of

u

and

v

. Operationally, the value of

unamb u v

becomes available when the earlier of

u

and

v

does. The agreement precondition ensures unamb's referential transparency. For more info about

unamb

and its use, see the paper Simply Efficient Functional Reactivity, sections 10 and 11.

unamb

was originally a part of Reactive. I moved it to its own package in order to encourage experimentation.

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As of version 0.1.1, unamb requires ghc 6.10 or better.