From: Brian Candler <b.candler@...>
Date: 2011-08-01T16:48:35+09:00
Subject: Re: system stack error in ObjectSpace.each_object

This looks to me like an abuse of ObjectSpace.

If you need to keep track of all the objects of class Foo, then it would 
be better to make some sort of container which keeps track of them 
explicitly.

ObjectSpace is (a) inefficient, because it scans *every* object in the 
system, and (b) unreliable, because it may show you objects which should 
have died, but some reference is being held somewhere.

ObjectSpace is really just a debugging tool.

Also, finalizers are also extremely difficult to work with. There is 
almost never a good case for using them. You should consider them part 
of the internals of ruby (so that, for example, when an IO object gets 
garbage-collected then the underlying file descriptor gets closed)

Regards,

Brian.

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