John's code doesn't server as a fair comparison of Waitsome and Waitany. In fact, now that I look at it, it appears that his calls to Waitany are incorrect and furthermore will not lead to the same effect of Waitsome or Waitall w.r.t. populating the two output arrays. Jeff On Sat, Jan 18, 2014 at 11:48 AM, Jed Brown <[email protected]> wrote:

John Grime <[email protected]> writes:

...

Waitsome() seems to give consistently the worst performance ( Waitall < Waitany < Waitsome )

This is concerning because the entire point of Waitsome is to be faster than repeated calls to Waitany. In particular, a valid implementation just calls Waitany and returns one at a time.

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