From: nobuyoshi nakada <nobuyoshi.nakada@...>
Date: 2005-10-25T10:33:56+09:00
Subject: Re: instance_eval/instance_exec discussion

Hi,

At Tue, 25 Oct 2005 07:20:17 +0900,
Daniel Amelang wrote in [ruby-core:06375]:
> > It is not thread-safe.
> 
> Maybe, care to explain why?

(class<<self;self end).send(:define_method, :__inst_eval_temp__, block)
# another thread may intercept here.
result = __inst_eval_temp__(*args)

> I assume that you don't expect multiple threads to access the same object.
> It is generally assumed that you should guard your objects. E.g. noone
> expects a string object to handle #size properly while another thread calls
> #slice!. But you are probably referring to something else...?

If it is guraded outside, thread-safeness in a method is not
important, or even redundant.  In general, the word
"immediately" makes no sense with multi-threading.  Atomicity
is important.

> I guess I should have made it clearer: I'm not proposing to add this
> _implemenation_ to the ruby language, I'm asking if the proposed _behavior_
> would be useful.

I know, and don't intend to offend you at all.  Just a nitpick.

-- 
Nobu Nakada