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From: =?UTF-8?Q?Maksymilian_Bogu=C5=84?= <mbogun@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Array not updated in procedure in protected type
Date: Sat, 23 Jan 2010 08:37:15 -0800 (PST)
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Date: 2010-01-23T08:37:15-08:00
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On 22 Sty, 17:51, xavier grave <xavier.gr...@ipno.in2p3.fr> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
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>
> Maksymilian Bogu=C5=84 a =C3=A9crit :
>
>
>
> > Hi!
> > I created a protected object with a private array of records. When I
> > want to update the elements of this array, I use a procedure in this
> > protected object. The important part is:
>
> > My_Bird :=3D Birds(Bird_I);
> > if not My_Bird.Alive then
> > =C2=A0 =C2=A0return;
> > end if;
> > My_Bird.Alive :=3D False;
> > Birds(Bird_I) :=3D My_Bird;
>
> > When running with debugger, I can see, that Birds(Bird_I).Alive is
> > False after this code is executed. However, when I switch to another
> > task and call this procedure again Birds(Bird_I).Alive is still True.
> > The array is not modified anywhere else, only through this protected
> > object. What is wrong, why doesn't it work?
>
> Can you add a little more code ?
> the protected type declaration for example
> or best of all : a simple test_case where this code is ?
>
> xavier
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Ah, nevermind, I solved the problem - it was a race condition in a
totally different part of the program :)
I really hate multithreaded programming :(

Cheers,
-- Max