From: kcline17@hotmail.com (Kevin Cline)
Subject: Re: rendez-vous underlying mechanism
Date: 8 Apr 2002 10:05:27 -0700
Date: 2002-04-08T17:05:28+00:00 [thread overview]
Message-ID: <ba162549.0204080905.24486c34@posting.google.com> (raw)
In-Reply-To: 3CA2A827.11140295@adaworks.com
Richard Riehle <richard@adaworks.com> wrote in message news:<3CA2A827.11140295@adaworks.com>...
> Kevin Cline wrote:
>
> > "Bozo" <gri_nob@yahoo.com> wrote in message news:<a7pk89$kj4$1@bcarh8ab.ca.nortel.com>...
> > > Hi all,
> > >
> > > I'm sorry I wasn't clear enough.
> > > I don't use ADA at the moment but I was a brave ADA programmer once.
> > > I use C at the moment and I have a case where synchronous rendez-vous would
> > > be better that traditional asynchrounous intertask communications.
> > >
> > > Does anyone have an idea how to implement that in C with semaphores for
> > > example ?
> >
> > This depends on the underlying OS. If you are using pthreads,
> > then see the manual entry for pthread_cond_wait.
>
> This approach, of course, does not come close to the capabilities
> already built-in to the Ada tasking model. Ever heard of protected
> types.
I know that. However, in a hosted environment, the imperfect
mapping between the Ada tasking model and the underlying OS facilities
can catch programmers by surprise. I was certainly surprised
when I attempted to create a separate task for I/O but found that
all tasks blocked anyway because they were mapped to a single Unix thread.
On that implementation Ada multi-tasking was uselsss for solving
problems routinely handled with Posix threads.
next prev parent reply other threads:[~2002-04-08 17:05 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-25 13:48 rendez-vous underlying mechanism Bozo
2002-03-25 20:09 ` Marin David Condic
2002-03-26 1:44 ` Adrian Hoe
2002-03-26 1:16 ` Jeffrey Creem
2002-03-26 2:05 ` Adrian Hoe
2002-03-26 2:16 ` Jeffrey Creem
2002-03-26 6:04 ` Simon Wright
2002-03-26 10:17 ` Adrian Hoe
2002-03-26 9:31 ` tgingold
2002-03-26 10:40 ` David C. Hoos, Sr.
2002-03-27 1:42 ` Adrian Hoe
[not found] ` <a8olf7$enj$3@nntp9.atl.mindspring.net>
2002-04-07 6:44 ` Pascal Obry
2002-04-08 7:48 ` Jean-Pierre Rosen
2002-03-26 10:58 ` Bozo
2002-03-26 14:10 ` Marin David Condic
2002-03-26 14:57 ` Kevin Cline
2002-03-28 5:20 ` Richard Riehle
2002-03-28 15:44 ` Marin David Condic
2002-04-08 17:05 ` Kevin Cline [this message]
2002-04-10 7:49 ` Ole-Hjalmar Kristensen
2002-04-10 13:39 ` Pat Rogers
2002-04-10 17:19 ` Kevin Cline
2002-04-10 17:23 ` Pat Rogers
2002-04-11 11:52 ` Ole-Hjalmar Kristensen
2002-04-11 16:01 ` Darren New
2002-04-10 17:58 ` Marin David Condic
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