From: nobu.nokada@...
Date: 2002-12-18T20:06:56+09:00
Subject: Re: $SAFE block?

Hi,

At Wed, 18 Dec 2002 19:48:49 +0900,
Tim Bates wrote:
> > module Kernel
> >   def safe(level)
> >     proc {$SAFE = level; yield}.call
> >   end
> > end
> >
> > p Thread.current.safe_level		# => 0
> > p safe(4) { Thread.current.safe_level }	# => 4
> > p Thread.current.safe_level		# => 0
> 
> Much better! It doesn't use more threads, which is what I was looking for. I 
> didn't realise Proc reset $SAFE at its end. Thanks a lot. And thanks to the 
> person who submitted the other solution, even if it wasn't what I wanted.

Proc doesn't reset $SAFE, but has each own safe level.

This behavior was pointed out by nagai@ai.kyutech.ac.jp at
[ruby-dev:17220], and admitted as feature.

-- 
Nobu Nakada