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From: Juergen Fischer <juergen.fischer@avitech.de>
Newsgroups: comp.lang.ada
Subject: Re: Using Xt intrinsics with Ada?
Date: Fri, 02 Feb 2001 16:48:04 +0100
Organization: Avitech - Aviation Management Technologies GmbH
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To: Stephen Leake <stephen.a.leake.1@gsfc.nasa.gov>
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Date: 2001-02-02T15:48:03+00:00
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Hi,

Stephen Leake wrote:

> Juergen Fischer <juergen.fischer@avitech.de> writes:
>
> > Hi,
> >
> > the problem is that we don't have the runtime that blocks on the task
> > level but only on the process level.
> > Therefore we have to use non blocking sockets. The XtAppMainLoop does
> > really poll,
> > but from other C programs we know that it doesn't take much CPU load.
> > So we suppose that the CPU load is caused by
> > Ada tasking in combination with the XtAppMainLoop.
>
> Ok, now you realize that you _cannot_ avoid polling, because your OS
> does not provide task-level blocking sockets. Bringing in X windows
> stuff cannot change that.

I had realized this before, but from C applications I know that socket
polling
by means of XtAppMainLoop costs less CPU load than a directly coded polling

solution.

>
>
> You can either get threads and sockets libraries that provide this
> functionality, or convert your program to a multi-process one,
> possibly using Ada partitions. Which OS and compiler are you using?

HP_UX 10.20 and Aonix ObjectAda 7.1.2

Juergen

>
>
> Or perhaps you can design an acceptable polling solution; it appears
> that you hoped the XtAppMainLoop would be such a thing. You are more
> likely to be successful if you code the polling directly. Perhaps you
> could use the source for XtAppMainLoop as a guide.
>
> --
> -- Stephe

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