From: Robert Klemme <shortcutter@...>
Date: 2010-03-08T02:20:06+09:00
Subject: Re: Weakref: can I use it like this?

On 03/07/2010 10:55 AM, Jeremy Henty wrote:
> I want  to do some extended processing  on an object referred  to by a
> weakref.  This might generate lots of  garbage so I don't want to turn
> off garbage  collection while I'm doing  this.  So I'd  really like to
> get  a proper non-weak  reference to  the weakref-ed  object (assuming
> it's not *already* garbage-collected).  Is it safe to do this?
> 
>     obj = weakref.__getobj__ # will raise error if weakref is invalid
>     process obj
> 
> I'm hoping this will ensure that  if the process method is called then
> it gets  a real  reference to  the weakref-ed object,  so that  it can
> safely execute even  though garbage collection is still  on.  I'm also
> hoping that  once the binding  of the obj  variable goes out  of scope
> then the object is available for garbage collection again.
> 
> Will  this work  as I  expect?   Is it  thread-safe?  Portable  across
> different Ruby implementations?  Have I missed some race condition?

I think that's exactly the way it should be done.

Kind regards

	robert

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