Threading to prevent GUI Freeze

[Luis via Digitalmars-d-learn]

On Monday, 4 January 2016 at 14:31:04 UTC, TheDGuy wrote:
> Hello,
>
> i use GTKD to draw some stuff on a DrawingArea. Because it 
> needs some time to calculate i want to outsource those 
> calculation so that the GUI doesn't freeze.
>
> I tried it with "std.concurrency" like this:
>
> bool drawCallback(Scoped!Context cr, Widget widget){
> 	writeln("init");
> 	spawn(&render, cr, widget);
> 	return true;
> }
>
> void render(Context cr, Widget widget){
> 	Renderer renderer = new Renderer(new Vector3D(0,0,0), cr, 
> widget);
> 	int  i = 0;
> 	while(i < 4){
> 		renderer.renderOneStep();
> 		i++;
> 	}
> 	renderer.DisplayResult();
> }
>
> But i get:
>
> "std.concurrency.spawn(F, T...)(F fn, T args) 
> if(isSpawnable!(F,T))"
> "Error: template std.concurrency.spawn cannot deduce function 
> from argument types!()(void delegate(Context cr, Widget 
> widget), Scoped Widget), candidates are:"


Before doing anything with threads and GTK, you should read this 
: 
http://blogs.operationaldynamics.com/andrew/software/gnome-desktop/gtk-thread-awareness