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Subject: Re: Greg's Perennial Plea For an Asynchronous Backend Interface
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>>>>> Greg Stark <gsstark@mit.edu>:

> All you need is an interface between Gnus and the backends that
> allows Gnus to pass a callback with a closure to the backend when an
> asynchronous call is permitted. And of course you want to do this in
> a backwards compatible way, so if the backend doesn't implement the
> asynchronous call Gnus just calls the normal backend function.

[snip!]
> Doing it properly requires the new interface between backends and
> Gnus. And it require Gnus be aware of when it's using the
> asynchronous interface to avoid conflicts. But it would be much more
> powerful than my kludge.

Is this basically the same thing that nnimap needs for its performance 
enhancements?