Question about the modesetting on X server

[Huang, FrankR]

Okay. I understand that. But how the X server knows that no cliens are connected again? Is there any time stamp to record it? 
Let me describe my debug process. I use GDB to debug the X server. When the X server is booting up, I set the breakpoint on modesetting function. Then I run "xrandr -s 1280x1024" to set the mode. Then the modesetting in dispatch is executing. After that, the dispatch will break out and while loop in dix_mian execute again. So is there a time stamp in dispatch to know no clients are connected?

Thanks,
Frank

> -----Original Message-----
> From: Alan Coopersmith [mailto:alan.coopersmith at oracle.com]
> Sent: 2011年4月28日 11:06
> To: Huang, FrankR
> Cc: xorg-devel at lists.freedesktop.org
> Subject: Re: Question about the modesetting on X server
> 
> On 04/27/11 07:46 PM, Huang, FrankR wrote:
> > Hi, all
> >
> > 	Right now, I am working on the graphics driver and use X server
> > architecture as our base. I finished the modeset part now. But I
> > encounter a problem that puzzled me.
> > 	As you know, in dix_main(), the mode will be set in
> > xf86CrtcCreateScreenResources. Then the code will go to dispatch to
> > listen to client's new requirement.
> > 	And I use command xrandr to change the resolution to the new
> > mode, I found that modeset will be done via ProcRRSetScreenConfig(). But
> > I also noticed that the dispatch will be break out. And the while loop
> > in dix_main() will be executed again. The serverGeneration will be
> > updated with new value. I am not sure why the Xserver will do this
> > again? Why the dispatch must be breaked out with this new resolution?
> 
> The X protocol requires the server to reset when no clients are connected
> to it.   To avoid that, keep a simple client such as xlogo or a window
> manager running - testing an X server with no clients connected isn't
> a good match for what users actually runs anyway.
> 
> --
> 	-Alan Coopersmith-        alan.coopersmith at oracle.com
> 	 Oracle Solaris Platform Engineering: X Window System
>