From: matz@... (Yukihiro Matsumoto)
Date: 2003-08-13T00:59:05+09:00
Subject: Re: $SAFE = 5 and Safe Ruby Misleading?

Hi,

In message "Re: $SAFE = 5 and Safe Ruby Misleading?"
    on 03/08/13, Dave Fayram <kirindave@lensmen.net> writes:

|Basically, can I evaluate something in a $SAFE = 4 thread, then get it 
|out and work with it meaningfully?

The untrusted thread can return value from it.  For example,

 def safe_eval(str)
   Thread.start {
     $SAFE=4
     eval(str)   # the last evaluated value
   }.value       # can be retrieved using "value" method
 end

Besides, the thread can push data to the queue, then data is read by
the trusted code, validated, then output.

							matz.