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Re: Passing lambda bindings to C for use as callback

From: Marc Singer
Subject: Re: Passing lambda bindings to C for use as callback
Date: Mon, 25 Nov 2002 19:22:23 -0800
User-agent: Mutt/1.4i

On Mon, Nov 25, 2002 at 06:45:45PM -0800, Marc Singer wrote:
> 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

 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.


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