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From: "Grein, Christoph" <christoph.grein@eurocopter.com>
Newsgroups: comp.lang.ada
Subject: Re: dynamic multithreading
Date: Mon, 18 Nov 2002 10:22:51 +0100 (MET)
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Date: 2002-11-18T10:22:51+01:00

Of course this program _must_ consume all memory.

You explicitly allocate on the heap, but never deallocate. That's what 
Unchecked_Deallocation is for.

Or do you mean even with Free, it consumes all memory?

> No need to argue, just try the following program with and without
> the "Free". If you find one Ada95 compiler one one platform where
> it does not eat up all the memory, please let us know.
> 
> With GNAT on Solaris, VMS, Linux, HP-UX and Windows, I already know
> the answer...
> 
> -Thierry
> 
> with Ada.Text_IO;
> with Ada.Unchecked_Deallocation;
> with System;
> 
> procedure Crazy_Tasks is
> 
>     task type T is
>         pragma Priority (System.Priority'Last);
>         entry Foo;
>     end T;
> 
>     type Access_T is access T;
> 
>     task body T is
>     begin
>         select
>             accept Foo;
>         else
>             null;
>         end select;
>     end T;
> 
>     procedure Free is new Ada.Unchecked_Deallocation (T, Access_T);
> 
>     type Counter is mod 2**32;
> 
>     Count : Counter := 0;
>     TV    : Access_T;
> 
> begin
> 
>     loop
>         TV := new T; -- should terminate immediately
>         while not TV.all'Terminated loop
>             delay 0.0;
>         end loop;
>         -- Free (TV);
>         Count := Count + 1;
>         if Count mod 50_000 = 0 then
>             Ada.Text_IO.Put_Line (Counter'Image (Count) & " tasks");
>         end if;
>     end loop;
> 
> end Crazy_Tasks;