Loadable module in Ada.

Loadable module in Ada.

[Steven Shack]

I'd like to create a loadable module in an Ada program. I've searched 
around, but can't
seem to find any examples of this. Say I've got some calculation or a 
driver and I'd like to have
multiple different versions of it with the same interface. I'd like to 
be able to load and replace
these modules at runtime.

In C I'd do this with pic code, dlsym and function pointers. I can't 
seem to find the equivalent
in Ada. Can anyone help me out?

Thanks

Re: Loadable module in Ada.

[xavier grave]

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Steven Shack a �crit :
> I'd like to create a loadable module in an Ada program. I've searched
> around, but can't
> seem to find any examples of this. Say I've got some calculation or a
> driver and I'd like to have
> multiple different versions of it with the same interface. I'd like to
> be able to load and replace
> these modules at runtime.
> 
> In C I'd do this with pic code, dlsym and function pointers. I can't
> seem to find the equivalent
> in Ada. Can anyone help me out?
> 
> Thanks
> 
> 
Hi,

I have done something that seems to fit with your need.
Here is a link where you will find a tgz file compiling/running under
Linux using dlsym. It is based on an abstract class that your plugin
should inherit of.

http://dl.free.fr/pWQwqMpVK

Be very careful about the elaboration code when you do some "with" of
other package. One on the "best" policy is to be the more restrictive
that you can with the packages you "with" (pragma Pure and so on...)

Hope it will help...
xavier


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Re: Loadable module in Ada.

[Steven Shack]

Thank you very much. This shows me exactly how to do what I want.
I was hoping for a pure ada solution, but if I have to do dlsym I'm 
fine with that.
I already know dlsym so it's not a problem.

On 2009-12-03 02:00:44 -0800, xavier grave <xavier.grave@ipno.in2p3.fr> said:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Steven Shack a �crit :
>> I'd like to create a loadable module in an Ada program. I've searched
>> around, but can't
>> seem to find any examples of this. Say I've got some calculation or a
>> driver and I'd like to have
>> multiple different versions of it with the same interface. I'd like to
>> be able to load and replace
>> these modules at runtime.
>> 
>> In C I'd do this with pic code, dlsym and function pointers. I can't
>> seem to find the equivalent
>> in Ada. Can anyone help me out?
>> 
>> Thanks
>> 
>> 
> Hi,
> 
> I have done something that seems to fit with your need.
> Here is a link where you will find a tgz file compiling/running under
> Linux using dlsym. It is based on an abstract class that your plugin
> should inherit of.
> 
> http://dl.free.fr/pWQwqMpVK
> 
> Be very careful about the elaboration code when you do some "with" of
> other package. One on the "best" policy is to be the more restrictive
> that you can with the packages you "with" (pragma Pure and so on...)
> 
> Hope it will help...
> xavier
> 
> 
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> dQkAoKwEqm+RGqPc6UmhAMu2d2tqwnEG
> =cLPw
> -----END PGP SIGNATURE-----

Re: Loadable module in Ada.

[Mark Lorenzen]

On 3 Dec., 10:36, Steven Shack <stevensh...@stevenshack.com> wrote:
> I'd like to create a loadable module in an Ada program. I've searched
> around, but can't
> seem to find any examples of this. Say I've got some calculation or a
> driver and I'd like to have
> multiple different versions of it with the same interface. I'd like to
> be able to load and replace
> these modules at runtime.
>
> In C I'd do this with pic code, dlsym and function pointers. I can't
> seem to find the equivalent
> in Ada. Can anyone help me out?
>
> Thanks

I'm not sure what you mean by loadable module, but if you mean dynamic
linking at run-time, you should take a look at this very interesting
article:
http://www.adacore.com/wp-content/uploads/2005/04/dynamic_plugin_loading_with_ada.pdf

Note that you will of course still need support from the OS, so there
is no pure Ada
solution, just as there is no pure C solution (the dl* system calls
just happen to
have a C API).

- Mark

Re: Loadable module in Ada.

[Pascal Obry]

Steven,

Look at the Gwiad module:

   http://code.google.com/p/gwiad/

   $ git clone git://repo.or.cz/gwiad.git

It is a framework using whatever OS services underneath based on Ada
interface.

Pascal.

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