From: Matthew Bloch <mattbee@...>
Date: 2002-07-26T12:22:41+09:00
Subject: Re: A couple of questions on writing extensions

On Friday 26 July 2002 01:56, nobu.nokada@softhome.net wrote:
> > which is nothing to do with my converted class, but the error implies
> > 'key' is somehow corrupt or of the wrong type, where the same code worked
> > before. This exception seems to be thrown from different points depending
> > on timing (though more often than not in a simple call to a logger),
> > which is pretty difficult to track down.
>
> I vote GC issue.  How do you define mark/free functions for
> Data_{Make,Wrap}_Struct?  Could you show us the source?

You're right, I think it was a misunderstanding with the mark/free functions 
specified by Data_Wrap_Struct.  I assumed they were passed VALUEs whereas in 
fact they're passed pointers to your data structure (you have to look at one 
of the examples in the source, ext/stringio to find this out; it's not 
explicit in README.EXT nor the pickaxe book).  As it happened, the program 
continued as normal for a while but presumably a piece of memory got doubly 
allocated to cause these weird effects.  Anyhow, it's all sorted now; thanks 
for the push in the right direction.

-- 
Matthew       > http://www.soup-kitchen.net/
              > ICQ 19482073