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Date: Thu, 31 Aug 2006 11:24:05 -0500
From: "Anh Vo" <Anh.Vo@baesystems.com>
To: <comp.lang.ada@ada-france.org>
Subject: Re: Simulating OS semaphore behavior
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Date: 2006-08-31T18:25:17+02:00

>>> "REH" <spamjunk@stny.rr.com> 8/25/2006 8:25 AM >>>

Dmitry A. Kazakov wrote:
> That looks like a classic automatic event for multiple tasks. Make
Signal
> an entry:
>
>    protected body Event is
>       entry Wait when Signal'Count > 0 is
>       begin
>          null;
>       end Wait;
>       entry Signal when Wait'Count = 0 is
>       begin
>          null;
>       end Signal;
>    end Event;
>
> Signal is blocked until all waiting tasks get released. There is no
race
> condition because fresh attempts to Wait are blocked if a signal is
> pending.
> 

Ah, just what I love: simple and elegant.  Thank you!

It is just simply beautiful, sweet and elegant solution. I had
implemented similar to Jean-Pierre's. I already changed to Dmitry's
implementation. This is another reason that Ada is in my heart.

AV