Threading to prevent GUI Freeze

[TheDGuy via Digitalmars-d-learn]

On Monday, 4 January 2016 at 17:33:28 UTC, Gerald wrote:
> On Monday, 4 January 2016 at 16:13:50 UTC, TheDGuy wrote:
>> [...]
>
> Yes, you need it. The extern (C) function is what GDK invokes 
> on idle. In any GUI application there is a lot of idle time 
> waiting for events, what the addThreadIdle allows you to do is 
> take advantage of this and tell GTK that whenever it's sitting 
> around doing nothing, give this function a call.
>
> [...]

Okay, thanks alot for your help. I think i will need some time to 
understand this but one last question:

Do the errors come from the fact at i didn't use those GTK thread 
mechanisms or that my function is not "spawnable"?

"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:"