Re: ... multithreaded application with GTK+...

[Kozlitin Ihor <kihor postmark net>]

> Message: 8
> Date: Wed, 1 Sep 2004 16:26:21 +0300
> From: Andrew Kirillov <andrew postmet com>
> Subject: GTK+ & GLib  threads
> To: gtk-app-devel-list gnome org
> Message-ID: <6222999359 20040901162621 postmet com>
> Content-Type: text/plain; charset=us-ascii
> 
> Hello.
> 
> I am writing a multithreaded application. There are two threads:
> 1) default thread for GUI and 2) a background thread, which downloads
> something from network. Sometimes I need to update some widgets
> depending on current state of the background thread. I am using a call
> to gtk_widget_queue_draw() from the background thread. Then the widget
> must receive the expose event and to draw something in the main
> thread. All works fine, but not so long. After some time the widget
> does not receive expose event any more. The background work performs
> as before, but the call to my callback for expose event does not
> occur. More of it - some widgets, menu for example, are not updated
> after it.
> 
> What happens ? Any ideas ?
> What is a safe method to invalidate some widgets from a background
> thread ?
> 
>   
> 
> -- 
> Best regards,
>  Andrew                          mailto:andrew postmet com
> 

Hi. 
IMHO, solution may be using queue. Background application may push
some info to queue (in their own thread) for instance using "global"
GList. Than thread that makes GUI changes may query that GList and do
proper work. This queue handler (in GUI thread) may be launched by
gtk_idle_...

Kozlitin Ihor
e-mail: kihor postmark net