Ada in VxWorks

Ada in VxWorks

[Marcus Hedlund]

Hi!

I have managed to integrate GNAT pro with VxWorks and am trying to run a few
ada programs.
However I can only run the same Ada program once. After trying to run it
twice, an exception is raised and the program hangs.
Anyone had this kind of problem?

Any help would appreciated,

/M. Hedlund

Re: Ada in VxWorks

[stefan.lindesvik]

Marcus Hedlund <marcus.hedlund@avionics.saab.se> wrote:
: Hi!

: However I can only run the same Ada program once. After trying to run it
: twice, an exception is raised and the program hangs.
: Anyone had this kind of problem?

You have to unld and (re)ld the program, e.g. from the target shell.

Re: Ada in VxWorks

[Toshitaka Kumano]

Marcus,

stefan.lindesvik@emw.ericsson.se wrote:
> 
> Marcus Hedlund <marcus.hedlund@avionics.saab.se> wrote:
> : Hi!
> 
> : However I can only run the same Ada program once. After trying to run it
> : twice, an exception is raised and the program hangs.
> : Anyone had this kind of problem?
> 
> You have to unld and (re)ld the program, e.g. from the target shell.

See
http://gcc.gnu.org/onlinedocs/gnat_ug_vxw/Frequently-Asked-Questions-for-VxWorks.html

-- 
Toshitaka Kumano
Kamakura, Japan

Re: Ada in VxWorks

[Emil Moholth]

"Marcus Hedlund" <marcus.hedlund@avionics.saab.se> wrote in message
news:amp60b$mtu$1@newstoo.ericsson.se...
> Hi!
>
> I have managed to integrate GNAT pro with VxWorks and am trying to run a
few
> ada programs.
> However I can only run the same Ada program once. After trying to run it
> twice, an exception is raised and the program hangs.
> Anyone had this kind of problem?

We are experiencing exactly the same.

>
> Any help would appreciated,

A solution would be convenient.

>
> /M. Hedlund
>

mvh

emilm

Re: Ada in VxWorks

[Ted Dennison]

Marcus Hedlund wrote:
> I have managed to integrate GNAT pro with VxWorks and am trying to run a few
> ada programs.
> However I can only run the same Ada program once. After trying to run it
> twice, an exception is raised and the program hangs.
> Anyone had this kind of problem?

I have to say that I don't really have that issue with GreenHills Ada. 
Of course you do have to realise that xvWorks does not clean up 
allocated resources for you like typical modern desktop OS's do. So if 
you you allocate a lot of memory and don't bother to free it, you may 
eventually find you have to reboot in order to run your program again.

Re: Ada in VxWorks

[Jeffrey Creem]

This is also true of the older VADS products. At least with VADS, the issue
was that
certain constructs (some default initialization, perhaps others) are done
not by generating code
but by inserting the default values in the the initialized data segment.
There are many benefits to
this but one downside is that if the data segment is then modified as the
program runs and you try
to re-run without a re-load you can end up with all sorts of strage
behaviour.

In some cases this is not as bad at it sounds. In general for my
applications I just have the main program
always running (perhaps doing nothing -- blocked) and just use externally
named procedures
(pragma Export) that I can call repeatedly (the external procedures will
typically run over
and over with no problems).

"Marcus Hedlund" <marcus.hedlund@avionics.saab.se> wrote in message
> I have managed to integrate GNAT pro with VxWorks and am trying to run a
few
> ada programs.
> However I can only run the same Ada program once. After trying to run it
> twice, an exception is raised and the program hangs.