Re: Using Xt intrinsics with Ada?

[Simon Wright <simon@pushface.org>]

Juergen Fischer <juergen.fischer@avitech.de> writes:

> We are just migrating from Verdix Ada83 to ObjectAda 95 compiler. In
> both cases we use HP-UX OS.  The load problem occurs even when I
> only monitor one single UNIX socket by means of XtAppMainLoop
> although there are no events on this socket.  When I disable all
> other tasks in the application, there is no CPU load. On the other
> hand, running all application tasks but the task with the
> XtAppMainLoop does not cause CPU load, either. It is only the
> combination which causes the problem.

It really does sound as though there is a nasty interaction between OA
tasking and HP-UX's select() (or poll(), depends what they have in the
innards of XtAppMainLoop()). Tasking is quite likely to use signals,
perhaps they're interfering ..

It won't help you much to know that we've not seen this problem with
Verdix/Solaris, DEC Ada/OSF1.3, GNAT/Solaris, GNAT/Linux :-)

Do Aonix have a view?

Is there a GNAT port for your machine (would be useful just as a
comparison point).

-- 
Simon Wright                       Work Email: simon.j.wright@amsjv.com
Alenia Marconi Systems                        Voice: +44(0)23-9270-1778
Integrated Systems Division                     FAX: +44(0)23-9270-1800