[Qt-interest] Create a new GUI Thread

[Andreas Pakulat]

On 02.03.09 15:05:06, Luke Campagnola wrote:
> On Wed, Feb 11, 2009 at 01:37, Andreas Pakulat <apaku at gmx.de> wrote:
> > On 11.02.09 02:04:52, Luis Roberto P. Paula wrote:
> > > I'm doing this because I need to have a different event loop for the
> > QDialog
> > > window.
> >
> > So you want two event loops that run in parallel, not one loop that blocks
> > the other (which can be done with QDialog::exec())? May I ask why?
> >
> > As to how to do that: The only way is putting the code that needs to run in
> > the second event loop into a separate application and then use IPC (like
> > QDBus) to communicate between the two processes.
> 
> 
> Is there some technical limitation in Qt that makes it unable to control two
> separate windows from different threads? I'd be absolutely thrilled if a
> future version of Qt would allow this behavior. I've seen variations on this
> question asked so many times that I'm sure I'm not alone..
> 
> Here's my current problem: I am writing a data acquisition/analysis
> application that does an enormous amount of number crunching and graphical
> output in realtime. The program is running on a quad-core machine and I have
> as much data processing as possible shuffled out to other threads, but the
> entire GUI (three windows spread across two monitors) is forced to run on
> one core and is becoming a bottleneck.
> 
> So my option now is to split the program into fragments,  put the
> application state into shared memory, and design an IPC protocol to handle
> all of the communication that was originally seamless? Maybe I could run the
> second window using GTK and the third using TK?
> 
> Can anybody tell me if this issue is being considered by the Qt developers?
> Is it even possible to fix at all?

No, its not possible to fix this, at least not in a cross-platform way.
On some platforms GUI operations simply have to be done from one thread,
because the underlying windowing system is not threadsafe.

Andreas

-- 
You will be surrounded by luxury.