From: "fabio de francesco" <fmdf@tiscali.it>
Subject: Re: tasks and protected types
Date: 29 Apr 2005 03:47:07 -0700
Date: 2005-04-29T03:47:07-07:00 [thread overview]
Message-ID: <1114771627.401153.78280@z14g2000cwz.googlegroups.com> (raw)
In-Reply-To: <m23bt9dik6.fsf@hugin.crs4.it>
Jacob Sparre Andersen wrote:
> Fabio de Francesco wrote:
>
> [...]
>
> > G : Generator;
>
> Global objects are a _very_ bad idea when doing tasking. Move it
into
> your task type.
Done.
>
> > task body Door is
> > Msg : String := "";
>
> Here you make the lenght of the string Msg 0.
Auch.
> > Val : Positive;
> > Times : Positive;
> > begin
> > accept Start( Str : in String; Tm : in Positive ) do
> > Msg := Str;
>
> And here you try to assign a string of length 6 to a string of length
> 0. It will fail with a Constraint_Error, but with tasking you don't
> always see the exceptions.
>
> And then I also prefer to keep the printing to a single protected
> object.
Why? Could lines come out intermixed? Does it mean that it is always
needed to protect every call to library functions and procedures? Do
they use global variables?
> Here's a modified version of your program using the advice above (and
> my pretty-printing style):
>
> [skip some code]
>
Why an error in using strings makes the program to behave as it was a
deadlock?
Thank you. Now the program runs without problems.
fabio de francesco
next prev parent reply other threads:[~2005-04-29 10:47 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-29 4:04 [newbie question] tasks and protected types fabio de francesco
2005-04-29 7:25 ` tmoran
2005-04-29 9:43 ` Jacob Sparre Andersen
2005-04-29 10:34 ` Alex R. Mosteo
2005-04-29 11:23 ` Jacob Sparre Andersen
2005-04-29 12:18 ` Adrien Plisson
2005-04-29 12:45 ` Ada.Text_IO and protected objects (Was: [newbie question] tasks and protected types) Jacob Sparre Andersen
2005-04-29 13:22 ` Poul-Erik Andreasen
2005-04-29 14:26 ` Egil H. H�vik
2005-04-29 20:28 ` Jacob Sparre Andersen
2005-04-29 20:39 ` Randy Brukardt
2005-04-29 21:23 ` Lionel Draghi
2005-04-29 22:11 ` fabio de francesco
2005-04-30 3:45 ` Jeffrey Carter
2005-04-30 7:21 ` Lionel Draghi
2005-05-02 8:11 ` Jean-Pierre Rosen
2005-04-30 12:47 ` Ada.Text_IO and protected objects Stephen Leake
2005-04-29 21:57 ` Ada.Text_IO and protected objects (Was: [newbie question] tasks and protected types) fabio de francesco
2005-04-30 9:07 ` Ada.Text_IO and protected objects Jacob Sparre Andersen
2005-04-30 10:21 ` Dmitry A. Kazakov
2005-05-02 10:41 ` fabio de francesco
2005-05-02 14:10 ` Jacob Sparre Andersen
2005-05-02 16:29 ` fabio de francesco
2005-04-29 15:23 ` Ada.Text_IO and protected objects (Was: [newbie question] tasks and protected types) Björn Lundin
2005-04-29 12:54 ` [newbie question] tasks and protected types Alex R. Mosteo
2005-04-29 10:47 ` fabio de francesco [this message]
2005-04-29 11:33 ` Jacob Sparre Andersen
2005-04-29 12:55 ` Alex R. Mosteo
2005-04-29 14:06 ` Egil H. H�vik
2005-04-29 14:12 ` Egil H. H�vik
2005-04-29 16:23 ` Robert A Duff
2005-04-29 20:19 ` Jacob Sparre Andersen
2005-04-30 11:58 ` Simon Wright
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