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From: Simon Wright <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: Possible compiler bug with this simple program
Date: Thu, 04 Sep 2008 21:49:56 +0100
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Date: 2008-09-04T21:49:56+01:00
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Jerry <lanceboyle@qwest.net> writes:

> The difference between the two cases ([1] described above, herein, and
> [2] the code in mixed Ada and C that I posted earlier), is that in
> [1], both the called procedure and the callback procedure are written
> in C, and the in problematic code [2], the called subprogram is in C
> (plmap) but the callback (mapform19) is written in Ada, with C
> conventions.

Referring to [2], you also need to be careful (GNAT & VxWorks at least)
if the C calling thread isn't an Ada task; the Ada code expects the
VxWorks TCB to contain a pointer to auxiliary Ada RTS structures.

Call GNAT.Threads.Register_Thread (as early as possible in the called
Ada subprogram, I guess! before it needs the secondary stack, for
example)