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[Chicken-users] Re: Structs

From: Felix Winkelmann
Subject: [Chicken-users] Re: Structs
Date: Tue, 15 Oct 2002 09:13:03 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.0.0) Gecko/20020530

Peter Keller wrote:
On Mon, Oct 14, 2002 at 08:57:05AM +0200, Felix Winkelmann wrote:

In this case I would create a number of foreign-lambda*s
that access the slots:

So, I actually thought of this, but rejected it because I didn't
understand how gc would affect it. I thought that I could end up with a
way that I'd have a valid z_stream object with a member field pointing
to gc'ed data.

There's no problem with GC, because the values stored/loaded
in/from the fields always undergo the normal processing
of arguments to foreign functions. It's only if you pass
values of type `pointer' (not `c-pointer' or `(pointer ...)'),
`scheme-object', byte-/number-vectors or locatives, when
you have to be careful. I recommend to create your
own byte-vectors (malloc'd) for storing the compressed data. Then
you can use finalizers to handle cleaning-up.


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