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From: Marc Singer <elf@buici.com>
Subject: Re: Passing lambda bindings to C for use as callback
Date: Mon, 25 Nov 2002 19:22:23 -0800	[thread overview]
Message-ID: <20021126032223.GB24594@buici.com> (raw)
In-Reply-To: <20021126024544.GA24594@buici.com>

On Mon, Nov 25, 2002 at 06:45:45PM -0800, Marc Singer wrote:
> ...works for a while and then the gh_apply fails stating that the
> callback function is missing.  My guess is that this callback, an
> anonymous lambda binding, is being garbage collected.  
> 
> I've found a reference to this problem and some solution being made
> for tcl.  Will someone share with me either the solution or a place to
> find it?

I found the answer by browsing an old CVS archive of the guile code.
Turned out to be quite easy.

 1) On startup, I register a hook using scm_c_hook_add () for
    scm_before_sweep_c_hook.

 2) I store SCMs for active callbacks in one datastructure
 
 3) When the hook procedure executes, it calls scm_gc_mark on each of
    the callback SCMs.

Cake.





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  reply	other threads:[~2002-11-26  3:22 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-11-26  2:45 Passing lambda bindings to C for use as callback Marc Singer
2002-11-26  3:22 ` Marc Singer [this message]
2002-11-26 12:10   ` Marius Vollmer
2002-11-26 20:55     ` Marc Singer
2002-11-26 21:56       ` Thien-Thi Nguyen

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