raise ThisDecayingInquisition, "anyone? anyone at all?"

I'm specifically stumped concerning #1, looking for ideas of any substance.
Thankyou, able minds everywhere.

_why

On Wed, Aug 09, 2006 at 03:09:32AM +0900, why the lucky stiff wrote:
> Two puzzles I am trying to solve:
> 
> 1. Ruby uses setitimer to switch threads.  I would like to use setitimer as well
> to abort a sandbox which runs longer than its timeout.  Can anyone recommend a
> signal which can be used for this?  Or could I get access to the thread
> switching routine so I can check sandbox timeouts between threads?  Or, perhaps
> there is another strategy.
> 
> 2. Block scopes are causing me some trouble since they have mixed scope.
> 
>      3.times do |i|
>        Sandbox.safe.eval("local_variables")  #=> ['i']
>      end
> 
> Method scopes, on the other hand, work fine.
> 
>      def box_eval(str)
>        i = 1
>        Sandbox.safe.eval(str)
>      end
>      box_eval("local_variables")  #=> []
> 
> When eval is called, I swap out ruby_scope for a new, blank struct SCOPE.
> Do I need to replace ruby_block and ruby_frame as well?