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From: Warren <ve3wwg@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Passing Ada Proc as a C Function Pointer
Date: Wed, 4 Aug 2010 17:24:09 -0700 (PDT)
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Date: 2010-08-04T17:24:09-07:00
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On Aug 4, 1:14=A0pm, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
wrote:
> On Wed, 4 Aug 2010 09:40:29 -0700 (PDT), Warren wrote:
> > I some types defined as:
>
> > =A0 type Thread_Context is private;
>
> pragma Convention (C, Thread_Context);

Let's not worry about the arguments. The WinAVR or even AVR-GCC
is very gnat specific.  System.Address is all I need where argument
pointers are required.

> > Because this part of the Ada code is not working, I'm suspicious that
> > the passed function pointer is incorrect (I have an all-C thread
> > example working).
>
> You have to pass a pointer to a procedure of C convention. You also must
> ensure that other parameters aren't passed by copy.

The only problem to be solved is the function pointer for the C
code (ignoring portability of course). The C side is going to
set up its stack and registers and then invoke the Ada side. I
have this working in pure C, but when I try to launch an Ada
thread, things seem to fall apart.

Warren