Gui thread and async jobs.

[king kikapu]

On May 8, 4:00 pm, "Diez B. Roggisch" <d... at nospam.web.de> wrote:
> king kikapu wrote:
> > Hi, i am reading the book "Python Cookbook, 2nd edition" and i
> > encountered a very handy recipe, the one that is called "Combining
> > GUIs and Asynchronous I/O with Threads"
>
> > It is talking about retain a main GUI thread, doing async work with
> > worker threads and have both talk through a Queue object to dispatch
> > their messages, so the main (GUI) thread remain responsive.
> > It has a very good example by using Tkinter and Qt that is indeed
> > working. The only point that make me wonder is that the QUI thread has
> > to use some polling to check for messages in the Queue.
>
> > Author said that another alternatives exists (by not doing polling)
> > but the complexity makes them non-practical for the 90% of ocassions.
> > I remember in C# we deal with that sort of things with events/
> > delegates.
> > Hos the same thing is possible in Python, has anyone any link(s) to
> > have a look ?
>
> It depends on the toolkit you use. Qt has thread-safe custom events in 3.x,
> and afaik signal/slots (and thus events) are generally thread-safe in 4.x.
> So, no problems there.
>
> Diez

Aha...So you do not use polling there (in Qt), correct ?