From: nobu.nokada@...
Date: 2005-06-19T13:10:13+09:00
Subject: Re: GC.disable not working?

Hi,

At Sun, 19 Jun 2005 06:32:44 +0900,
Eric Mahurin wrote in [ruby-talk:145790]:
> $stdout.sync=true
> @ids = {}
> 1000.times { |i|
>     print("[")
>     obj = "X"*i
>     id = obj.object_id
>     @ids[id] = true
>     ObjectSpace.define_finalizer(obj,method(:finalizer))
>     GC.disable
>     print("{")
>     @ids.each_key { |id|
>         # go make sure all objects seem valid (test size)
>         ObjectSpace._id2ref(id).size
>     }
>     print("}")
>     GC.enable

You enable GC here, so it can run by next GC.disable.  Then an
exception occurs after GC is disabled, therefore GC will be no
longer enabled.

>     print("]")
> }
> 
> 
> I tried this on 1.8.2 and a 1.9 CVS version.  In both it calls
> the finalizer when GC is disabled (GC.enable==true).  I thought
> this would be impossible.  I also get a recycled object error. 

Finailizers don't run immediately after the corresponding
objects get collected.  The `finalizer' runs at the process
termination.

> In the 1.9 version I'm using, it hangs while trying to finalize
> one of the objects (@ids.delete(id) is where it hangs).

It's a bug, I'll investigate it.

-- 
Nobu Nakada