Artur Pereira,  Antonio Rui Borges,  Antonio Ferrari. 

The mutual exclusion element (mutex) is a well-known hardware device used to fairly implement a mutual exclusion relation between concurrent entities, for instance in asynchronous circuit design. In this paper we generalize this notion introducing the exclusion relation of k out of n. We then propose a circuit construction, built up from mutex elements, of a hardware component implementing this exclusion relation. Finally, we present an example, in the field of speed independent asynchronous circuits, where this component is used.

http://ieeexplore.ieee.org/iel5/8726/27627/01232822.pdf?tp=&arnumber=1232822&isnumber=27627

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