[DGD] atomic functions

[pete at ana.sk]

>     atomic int do_something()
>     {
>         ...
>         if (some_condition) {
>             error("abort");
>         }
>         ...
>         return 1;
>     }
> 
>     int catch_something()
>     {
>         catch {
>             return do_something();
>         } : {
> 	    return 0;
>         }
>     }
> 
> Easily extended if you only want to do this for a certain type of errors.
> 
> The reason for not allowing a return of arbitrary data out of an aborted
> atomic function is that it could refer to data (objects) that does not
> exist outside of the atomic context.  This is not going to change.

This is how im doing it already, just thought there could be 
something better...
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