Re: Creating modules from C (was: On the deprecated auto-loading of compiled-code modules)

[Martin Grabmueller]

> From: Matthias Koeppe <address@hidden>
> Date: 09 May 2001 13:07:03 +0200
> 
> Marius Vollmer <address@hidden> writes:
> 
> > - Explicitely create and select your module in the initialization routine
> > 
> >   In C:
> > 
> >     SCM_SYMBOL (sym_my, "my");
> >     SCM_SYMBOL (sym_modules, "modules");
> > 
> >     init_module_bindings ()
> >     {
> >       SCM my_module = scm_make_module (SCM_LIST2 (sym_my, sym_module));
> >       /* If you want to have Scheme code in the module as well: */
> >       scm_ensure_user_module (my_module);
> > 
> >       SCM old = scm_set_current_module (my_module);
> > 
> [ definitions go here ]
> > 
> >       scm_set_current_module (old);
> >     }
> > 
> >   There would be no Scheme file.
> 
> I have now tried to create a pure object-code module from C, so I
> followed the approach above but left out the scm_ensure_user_module
> part.  The definitions made via gh_new_procedure et al. don't seem to
> get exported reliably.  In fact, when I initialize a sequence of
> modules like this, only the first one's bindings seem to get
> exported.  When using the other modules, Guile reports "No code for
> module...", and in fact, the bindings are all missing.
> 
> Am I missing something?

After improving my module system wisdom a bit over the last week, I'll
try my luck.

When you make a module with scm_make_module() and set that as the
current module, you simply create a new namespace into which the
definitions are put, but none of the bindings will be added to the set
of exported bindings.  So, as I understand it, there should be no
exported bindings available at all. [and I'm quite surprised that you
say some definitions _are_ exported]

The exported items of a module are kept in the module's ``public
interface'', which is a kind of special-purpose-module associated with
the module.  So it is necessary to create that interface.  That is
what scm_ensure_user_module() does.

Also necessary is that the bindings to be created are added to the
interface, and this is what I have not yet figured out.

Can anybody else please jump in and help me out???

I will try to play around with that and post a working example, if I
succeed.

HTH so far,
  'martin