Re: Maybe I need to use threads. I've been using gtk_main_iteration_do() but having problems

[Tristan Van Berkom <tvb gnome org>]

On Tue, 2007-10-16 at 16:12 -0600, Jeff Eberl wrote:
[...]
> First is that the display doesn't do anything when my program is doing
> it's thing.  So it looks like it freezes.  I'm okay with that.  I've
> never used threads before, and I'm not sure this is the best project to
> start with.  

ofcourse this can be fixed by splitting up whatever your app does into
smaller less cpu/load intensive itterations thus updating the gui more
often, but that involves work (just like integration your execution
into timeout/idle callbacks would involve work).

> Second is the most annoying part.  Since there is no loop,
> gtk_main_quit() doesn't work, and when I click the little [X] in the
> corner, the destruction begins, calls my WindowDestroyEvent that I set
> up in the signals, but my program has no idea that the window has been
> destroyed.

How can your program have no idea that the window is being closed
if you set the signal handler for "delete-event" ?

>   Then the program keeps making the same calls to gtk.  So gtk
> spits out a bunch of messages about how everything is failing.  
> 
> Is there a way to check to see if the window has been destroyed?  I
> could put a member boolean that changes when WindowDestroyEvent gets
> called but that seems like a suspicious hack.  

However you do it, its definitely up to you to bookkeep that information
(some might keep a pointer to the active display window and set it to
NULL when the window is destroyed, I dont see how thats better than 
a boolean variable).

For elegancy, you might want to add it to a structure that gets passed
around to all callbacks instead of crudely packing it into global scope.

Cheers,
                  -Tristan