Threaded drawing and gtkmm

[Marc Singer <elf woollysoft com>]

Greetings,

I've looked online extensively for an explanation of the current 
best-practice for implementing drawing on a thread separate from the 
application main thread.  There is this resource for Cairo.

  https://www.cairographics.org/threaded_animation_with_cairo/

There are many resources explaining that the methods in the above page 
are deprecated.  There don't seem to be any explaining what should be 
done instead.

Pointers welcome.

Cheers