Re: [Q] automagic define/undefine with dynamic-link/dynamic-unlink

[Marius Vollmer <mvo@zagadka.ping.de>]

Ole Myren R|hne <mrohne@mixing.uio.no> writes:
>
> I want to use the _init and _fini symbols to automatically
> define/undefine extensions as a dynamic library is linked/unlinked. My
> naive approach looks like:
> 
> mysin.c:
> #include <math.h>
> #include <guile/gh.h>
> SCM mysin(SCM x) {return gh_double2scm(sin(gh_scm2double(x)));}
> void _init(void) {gh_new_procedure("mysin", mysin, 1, 0, 0);}
> void _fini(void) {gh_eval_str("(undefine mysin)");}

Hmm, off hand I would say that this doesn't work.  But, obviously, it
does.  Strange.

I would have said that using the .init/.fini sections of the ELF
object format is not that simple.  You would have to use global C++
objects, or some gcc extension.

Any way, now that I see that it *does* work, I have to say that I
don't like it.  "_init" and "_fini" seem to be very magical names, but
only with ELF.

> Question: guile seems to leak memory each time the test is repeated. I
> am looking for some `gh_delete_procedure' that guarantees that all
> resources allocated by gh_new_procedure are released.

Hmm, how much memory does it leak?