Re: [eclipse-dev] Eclipse beginner threading question...

[Horst Heistermann <horst.heistermann@xxxxxxxxxx>]

Russ Rufer wrote:

> You should only use the SWT event thread to manipulate your SWT 
> widgets. You can invoke a method on the event thread using either 
> Display.syncExec(Runnable runnable) or Display.asyncExec(Runnable 
> runnable) -- depending on whether you want your background thread to 
> block.
>
> From your MultiPageEditorPart, you should be able to do something like:
>
> Runnable runnable = new Runnable() {
>    void run () {
>       // activities you want to perform in the event thread
>    }
> };
>
> getSite().getShell().getDisplay().asyncExec(runnable);
>
>
> Hope that gets you unstuck.
>
> - Russ
>
>
> Horst Heistermann wrote:
>
> > Hi,
> >
> > I am new to eclipse and I am having a problem with threads. I have 
> > created a MultiPageEditorPart
> > editor. I have a background thread listening to model changes in my 
> > application. I am notified of these changes
> > in a non -gui thread. I want to set MultiPageEditorPart as dirty 
> > whenever I receive a model change event.
> > So I wrote a function like this
> >
> > public void setEditorModified() {
> >       m_bModified = true;
> >       if (!super.isDirty()) {
> >           firePropertyChange(IEditorPart.PROP_DIRTY);
> >       }
> >   }
> >
> >
> > This method crashes whenever I call it from the background thread. 
> > Below is the error stack. But it is a bit misleading. From the 
> > debugger, I can see the issue is with the thread I am calling 
> > firePropertyChange() from. Can anyone tell me what is the proper  way 
> > to update the dirty state from a background thread. Also, the 
> > background thread is not aware of the GUI components it only has a 
> > refer.
>
>
>
> _______________________________________________
> eclipse-dev mailing list
> eclipse-dev@xxxxxxxxxxx
> To change your delivery options, retrieve your password, or 
> unsubscribe from this list, visit
> https://dev.eclipse.org/mailman/listinfo/eclipse-dev

Hi Russ,

 Thanks for your reply. But I am still stuck. My problem is that I  
have a listener and it gets notifed when a change has occurred in the 
model. The listener is being notified
in a non gui thread. So when I am notified of the change it is on a non 
ui thread. I then am trying to  call the line of code you have suggested

getSite().getShell().getDisplay().asyncExec(runnable);

from this non ui thread. It then crashes because evidently this is not 
legal.  I guess what I am looking for is some utility or method that I 
can say run this on the UI thread but
I can call the utility or method from this background thread. Something 
like Swingutilities,.invokeLater in swing.

-- Horst