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From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
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Subject: Re: kqueue giant-locking (&kq_Giant, locking)
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In article <200404170212.i3H2Cg8n031749@green.homeunix.org> you write:
>1. The recursion has been removed from kqueue.  This means kqueues cannot be
>   added to other kqueues for EVFILT_READ -- yes, that ability has been
>   around since r1.1 of kern_event.c,

Actually, I'm fairly certain that Jonathan considered this to be a
fairly important property of kqueue and his papers do mention it.
It was done that way specifically to allow a kqueue to be included in
some larger application's event polling loop without needing to know
how it was implemented.

-GAWollman