On Tue, 22 Dec 2009 17:43:58 -0500
Jeff Garzik <j...@garzik.org> wrote:

> It is normal and reasonable to maintain global information about all 
> in-progress operations.  Caching systems do that, for example, to ensure 
> multiple cache requests for object A do not initiate multiple 
> simultaneous back-end requests for object A.

Unfortunately, this requires a data structure that permits searching.
Since I lack the classical CS education, I cannot select an appropriate
structure beyond "double-linked list and a hope that we'll never see
more than 10 simultaneous I/Os".

-- Pete
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