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Date: Wed, 21 Jan 2009 15:33:03 -0600
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] [6391] Fix nographic mode and VNC
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To: qemu-devel@nongnu.org

Blue Swirl wrote:
> On 1/21/09, Samuel Thibault <samuel.thibault@ens-lyon.org> wrote:
>   
>> Blue Swirl, le Wed 21 Jan 2009 22:16:15 +0200, a écrit :
>>
>>     
>>> On 1/21/09, Samuel Thibault <samuel.thibault@ens-lyon.org> wrote:
>>>       
>>  > > Blue Swirl, le Wed 21 Jan 2009 19:28:14 +0000, a écrit :
>>  > >
>>  > > > +static void nographic_update(void *opaque)
>>  > >  > +{
>>  > >  > +    uint64_t interval = GUI_REFRESH_INTERVAL;
>>  > >  > +
>>  > >  > +    qemu_mod_timer(nographic_timer, interval + qemu_get_clock(rt_clock));
>>  > >  > +}
>>  > >
>>  > >
>>  > > Maybe less often than 33 times per second?  SDL uses 2 times per second
>>  > >  when the window is minimized.
>>  >
>>  > I just tried: it's not enough, the serial console is unusably slow.
>>
>>
>> Mmm, I haven't followed everything so I probably misunderstand, but I
>>  guess you are talking about a serial console on stdio, shouldn't we
>>  already be monitoring the stdin fd to break the cpu emulation loop?
>>     
>
> Some other way, like SIGIO or IO worker thread, may work too. It may
> also be a big change.
>   

The solution is an IO thread.  I've been working on this on and off for 
KVM and now I think I see how to do it for TCG.

With an IO thread, select() could run while TCG ran and when select() 
returned, it would signal to TCG as if a signal handler was invoked.

Regards,

Anthony Liguori