GNAT equivalent for Green Hills functionality

GNAT equivalent for Green Hills functionality

[Michael P. Card]

Hello CLA-

In the past I have developed heterogenous programs comprised of Ada and 
C++ code linked together. These projects involved the use of gcc for the 
C++ and Green Hills AdaMULTI for the Ada code. For cases where C++ was 
the "main" program, Gren Hills provided 3 C functions that made the 
integration much easier:

rts_task_init()- registers a C thread with Ada run-time so that after 
this call Ada will see it as if it were an Ada task. This way the C code 
can call Ada code that might make a protected object call, task 
rendezvous etc and teh C thread will be suspended and restarted properly 
just as if it were an Ada task

adainit()- kicks off all Ada elaboration, initialization etc just as 
would happen at program start if Ada were the "main"

adafinal()- finalizes all objects just as would occur at end-of-program 
if Ada were the "main"

Does GNAT provide similar capability for cases where C++ is the "main"? 
Note that it may be that we will be using a C++ compiler other than gcc, 
I have heard that Ada/C++ integration is easy with GNAT if the C++ code 
is compiled with gcc.

- Mike

Re: GNAT equivalent for Green Hills functionality

[Jean-Marc Bourguet]

michael.p.card@lmco.com (Michael P. Card) writes:

[Gren Hills provided 3 C functions]

> rts_task_init()- registers a C thread with Ada run-time so that after 
> this call Ada will see it as if it were an Ada task. This way the C code 
> can call Ada code that might make a protected object call, task 
> rendezvous etc and teh C thread will be suspended and restarted properly 
> just as if it were an Ada task

I seem to remember that there is something similar with gnat, but I've
not used it.

> adainit()- kicks off all Ada elaboration, initialization etc just as 
> would happen at program start if Ada were the "main"
> 
> adafinal()- finalizes all objects just as would occur at end-of-program 
> if Ada were the "main"

These are defined in the standard, and I've used them with gnat.

> Does GNAT provide similar capability for cases where C++ is the "main"? 
> Note that it may be that we will be using a C++ compiler other than gcc, 
> I have heard that Ada/C++ integration is easy with GNAT if the C++ code 
> is compiled with gcc.

From what I've understood, Ada/C++ integration is easy with GNAT,
whatever compiler is used for C++.  It comes with the interface set up
for g++ but you can describe your C++ compiler.  And obviously if you
are interfacing with C calling convention (using only extern "C" C++
functions), then the way of doing it is standard.

I suggest to contact ACT, your email address makes me doubt that you
should be using GNAT without support and from what I get, the quality
of their support is their main selling argument.

Yours,

-- 
Jean-Marc