From: "Victor \"Zverok\" Shepelev" <vshepelev@...>
Date: 2006-10-29T03:26:10+09:00
Subject: How to understand why object is not collected?

Hi all.

Here's a problem.

I have some object of MyClass with complex "freeing" logic, and I want to
test this logic.
I do:

---------
span = ....     #somehow created object

ObjectSpace.define_finalizer(span, proc{p "gc ok"})  #define test finalizer

span.detach     #remove object from all of my internal caches, no references
to object should exist

span = nil      #remove the last reference to object

GC.start        #<===HERE the object must be collected and finalized

p "end of code"
---------        

I expect:
---
"gc ok"
"end of code"
---

I receive:
---
"end of code"
"gc ok"
---

OK, I suppose there are some references to the object still exists. I want
to know, at least, what number of references still exists (in ideal, I'd
want to know, where they are). 
How I can? (except of harcode hacking GC's C code)

Ruby 1.9 (downloaded a week ago), Windows.

Thanks.

V.