Re: question about tasks, multithreading and multi-cpu machines

[Jean-Pierre Rosen <rosen@adalog.fr>]

Norbert Caspari a �crit :
> 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.
"task" was the name commonly used for this at the time Ada was designed.
Only (much) later light-weight concurrency was introduced in Unix, and 
for some mysterious reason they called that "threads" instead of "tasks".

> 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".
> 
It depends on which run-time you use. If you use FSU-threads, you'll use 
only one CPU, but if you use native threads, you should get full use of 
you CPUs. Check the documentation to learn how to switch run-times (it 
is just a symbolic link you need to change).

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            J-P. Rosen (rosen@adalog.fr)
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