Poll'able Queue objects.

[Chris Watson]

As an aside. Granted this is *NON PORTABLE* and BSD specific. BSD has a
*really* cool replacement for select/poll called kqueue. It is currently
in FreeBSD and NetBSD AFAIK.

DESCRIPTION
     kqueue() provides a generic method of notifying the user when an
     event happens or a condition holds, based on the results of small
     pieces of kernel code termed filters.  A kevent is identified by the
     (ident,filter) pair; there may only be one unique kevent per kqueue.

     The filter is executed upon the initial registration of a kevent in
     order to detect whether a preexisting condition is present, and is
     also executed whenever an event is passed to the filter for evaluation.  
     If the filter determines that the condition should be reported, then 
     the kevent is placed on the kqueue for the user to retrieve.

     The filter is also run when the user attempts to retrieve the kevent
     from the kqueue.  If the filter indicates that the condition that
     triggered the event no longer holds, the kevent is removed from the
     kqueue and is not returned.

<...snip...>

It scales like a fantasy :) 
http://www.kegel.com/dkftpbench/Poller_bench.html
Very very nice. For those of use using BSD that is. Also Doug White wrote
a Python wrapper for kqueue. It's in FreeBSD's ports tree as Py-Kqueue.

--
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-Chris Watson         (316) 326-3862 | FreeBSD Consultant, FreeBSD Geek 
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