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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: question about tasks, multithreading and multi-cpu machines
Date: Wed, 15 Mar 2006 06:46:19 +0000
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Norbert Caspari <nnc@gmx.li> writes:

> In Ada it is possible to declare multiple parallel running "tasks". But for 
> my opinion the keyword "task" is somewhat misleding because in fact, those 
> "tasks" are really threads.

If you used VxWorks you would find that the right word to use was
'task' throughout. Threads/tasks mean different things to different
folk using different languages, get used to it.

On several platforms GNAT uses POSIX threads to implement tasking,
don't know about HPUX.

> If I run such a program on a multi-cpu machine, the process itself will use 
> only one cpu, even though I create several "tasks".
>
> I tested this with gnat v3.15p under HPUX 11 on a multi-cpu server.
>
> How can I write my code to utilize all cpu's on such a machine? Is there a 
> different way in Ada to perform multi-tasking instead of multi-threading?

I have had an SMP Linux x86 box for years, runs tasks on both CPUs
with no trouble (though I haven't used 3.15p for a long time).