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Re: [Qemu-trivial] [Qemu-devel] [PATCH] Use SIGIO with caution

From: Jan Kiszka
Subject: Re: [Qemu-trivial] [Qemu-devel] [PATCH] Use SIGIO with caution
Date: Tue, 31 May 2011 16:06:26 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv: Gecko/20080226 SUSE/ Thunderbird/ Mnenhy/

On 2011-05-31 15:47, Anthony Liguori wrote:
> On 05/29/2011 04:50 PM, Andreas Färber wrote:
>> BeOS and Haiku don't define SIGIO. When undefined, it won't arrive
>> and doesn't need to be blocked.
>> Signed-off-by: Andreas Färber<address@hidden>
> Anything to do with signal masks is never a trivial patch BTW...
> But I actually think explicit handling of SIGIO is unneeded.  I think 
> this is a hold over from the pre-I/O thread days where we selectively 
> set SIGIO on certain file descriptors to make sure that when an IO fd 
> became readable, we received a signal to break out of the KVM emulation 
> loop.
> Can the folks on CC confirm/deny?
> I can't see any use of SIGIO in the current source tree.

At least qemu-timer.c uses SIGIO in HPET mode. That only applies to
Linux hosts, though.


Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux

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