From: Eric Hodel <drbrain@...7.net>
Date: 2005-01-20T09:04:44+09:00
Subject: Re: 1.8.2 - conituations memory leak fixed?

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On 19 Jan 2005, at 11:36, Michael Neumann wrote:

> Am Mittwoch 19 Januar 2005 19:35 schrieb Eric Hodel:
>> On 19 Jan 2005, at 08:15, Michael Neumann wrote:
>>> Am Mittwoch 19 Januar 2005 16:53 schrieb ts:
>>>>>>>>> "j" == jc  <james.cromwell@gmail.com> writes:
>>>>
>>>> j> This was posted recently:
>>>> j> 
>>>> http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/124213
>>>>
>>>>  This is the proof that the GC is conservative, this does not mean
>>>> that it
>>>>  exist a memory leak.
>>>
>>> Sure, but the results might be the same ;-)
>>
>> I don't see a callcc in there anywhere, so
>> callback_stream.with_callbacks_for could be doing other naughty 
>> things.
>
> Right. But it's the place where the callbacks are invoked. And the 
> callback
> that gets invoked actually uses callcc. It was very strange that, when 
> I
> change that line in some manner (introduce an assignment), the memory
> consumption changes drastically.

Due to the way Ruby saves the environment, the problem could be on the 
line you show, or it could be where callcc is invoked.  Without a 
simple testcase, its difficult to track this problem down to a memory 
leak, or a result of the conservative GC/environment feature:

def x
   w = :stuff
   proc do # w is free in this proc, so we don't need to save any 
reference to it
           # in the proc
     puts "w: #{eval "w"}" # grab w out of the environment
   end
end

x.call # prints w: stuff
        # Because ruby keeps the entire local variable table around, we 
can get to w
-- 
Eric Hodel - drbrain@segment7.net - http://segment7.net
FEC2 57F1 D465 EB15 5D6E  7C11 332A 551C 796C 9F04

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