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

[Jan Kiszka <jan.kiszka@siemens.com>]

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<andreas.faerber@web.de>
> 
> 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.

Jan

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