[GUI] Another call for votes

[Glynn Clements]

Nick Name wrote:

> >  	4d) First wait and see if 4c is implementable; if not, fall back
> >  	to 4b.
> 
> Well, I agree on everything and would directly vote for 4b, but instead
> I ask: what is the true problem here? If callbacks are serialized,
> what's the problem in allowing any thread to call CGA functions? There
> is a chance that some windowing system allows this. For example, mutual
> exclusion could be required for drawing on a surface, but not for
> registering a callback, so while a thread is drawing, another could be
> allowed to register callbacks.
> 
> Could someone explain what are the problems?

The problem is that a toolkit may not be at all re-entrant; i.e. 
calling any toolkit function while another toolkit function is being
executed may have undesirable consequences.

-- 
Glynn Clements <glynn.clements@virgin.net>