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From: anders@legolas.gidenstam.org (Anders Gidenstam)
Newsgroups: comp.lang.ada
Subject: Re: time-slicing
Date: Mon, 15 Jul 2002 21:05:58 +0200
Organization: Chalmers University of Technology
Message-ID: <me6vga.1s2.ln@legolas>
References: <pan.2002.07.15.10.24.43.431977.7868@gmx.net>
    <mailman.1026738482.11997.comp.lang.ada@ada.eu.org>
    <pan.2002.07.15.16.01.11.552776.1135@gmx.net>
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In article <pan.2002.07.15.16.01.11.552776.1135@gmx.net>,
	Jan Prazak <janp9@gmx.net> writes:
> Maybe gnat doesn't even support time-slicing, but there is a command line
> switch and also a pragma (but as I have said, both unfortunately don't
> work).
> But actually I don't need this at the moment, it was just a question.

Hi,

I think the time-slice is a lot longer than the time it takes to call
Put_Line twice, so it is quite unlikely that you will get a task switch
in the middle.

The following small program may give you some idea on how much work
your computer actually manages to do during one time-slice.. and it
will also show whether your gnat installation does time-slicing or
not.
(I certainly expects it does, with the standard Ada runtime library
for Linux tasks are mapped to Linux threads and those are time-sliced
by default.)

with Ada.Text_IO;
procedure Task_Test is

   task type Writer (C : Character);
   task body Writer is
   begin
      loop
         Ada.Text_IO.Put (C);
      end loop;
   end Writer;

   A : Writer ('A');
   B : Writer ('B');
begin
   null;
end Task_Test;

/Anders
-- 
--------------------------------------------
"A well-written program is its own heaven; 
 a poorly-written program is its own hell."
  - The Tao of Programming