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From: "Pat Rogers" <progers@classwide.com>
Newsgroups: comp.lang.ada
References: <%12l8.9656$%_6.1717935@news11-gui.server.ntli.net>
 <3C94F235.80C7166A@adaworks.com>
 <1f8l8.12464$yb3.3172535409@newssvr11.news.prodigy.com>
 <3C95460D.4B2419D0@acm.org>
Subject: Re: tasks, protected types and entries
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Date: Mon, 18 Mar 2002 05:14:39 GMT
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Date: 2002-03-18T05:14:39+00:00
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"Jeffrey Carter" <jrcarter@acm.org> wrote in message
news:3C95460D.4B2419D0@acm.org...
> Pat Rogers wrote:
> >
> > "Richard Riehle" <richard@adaworks.com> wrote in message
> > news:3C94F235.80C7166A@adaworks.com...
> > > "chris.danx" wrote:
> > >
> > > > What is the difference between an entry and a procedure?
> > >
> > > This is one of the most important and least often address issue
> > > in Ada.  In my classroom, after we have started our unit on
> > > tasking, I have my students recite, in unison,
> > >
> > >                "An entry has a queue."
> >
> > Unless the Real-Time Annex is used, with the Ceiling_Locking policy.  Then
there
> > is no need for a queue.
>
> This is incorrect. Even with ceiling locking, an entry needs a queue. If
> the entry barrier is false, ceiling locking does not prevent multiple
> tasks from calling the same entry.
>

Yes, of course you are right -- it is the lock that is not necessary.  Mea
culpa.  Typing faster than thinking...