linux-kernel - Re: [take12 0/3] kevent: Generic event handling mechanism.

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Message-Id: <1156297866.2476.208.camel@entropy>
Date:	Tue, 22 Aug 2006 18:51:06 -0700
From:	Nicholas Miell <nmiell@...cast.net>
To:	Ulrich Drepper <drepper@...hat.com>
Cc:	David Miller <davem@...emloft.net>, jmorris@...ei.org,
	johnpol@....mipt.ru, linux-kernel@...r.kernel.org, akpm@...l.org,
	netdev@...r.kernel.org, zach.brown@...cle.com, hch@...radead.org
Subject: Re: [take12 0/3] kevent: Generic event handling mechanism.

On Tue, 2006-08-22 at 16:46 -0700, Ulrich Drepper wrote:
> I so far also haven't taken the time to look exactly at the interface.
> I plan to do it asap since this is IMO our big chance to get it right.
> I want to have a unifying interface which can handle all the different
> events we need and which come up today and tomorrow.  We have to be able
> to handle not only file descriptors and AIO but also timers, signals,
> message queues (OK, they are file descriptors but let's make it
> official), futexes.  I'm probably missing the one or the other thing now.

Are you sure about signals? I thought about that, but they generally
fall into two categories: signals that have to be signals (i.e. SIGILL,
SIGABRT, SIGFPE, SIGSEGV, etc.) and signals that should be replaced a
queued event notification (SIGALRM, SIGRTMIN-SIGRTMAX).

Of course, that leaves things like SIGTERM, SIGINT, SIGQUIT, etc. so,
uh, nevermind then. Signal redirection to event queues is definitely
needed.

> DaveM says there are example programs for the current interfaces.  I
> must admit I haven't seen those either.  So if possible, point the world
> to them again.  If you do that now I'll review everything and write up
> my recommendations re the interface before Monday.

There's a handful of little test apps at
http://tservice.net.ru/~s0mbre/archive/kevent/ , but they don't work
with the current iteration of the interface. I don't know if there are
others somewhere else.

-- 
Nicholas Miell <nmiell@...cast.net>

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