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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: About protected objects: entries with barriers depending on
 external data = bad practice ?
Date: Wed, 15 Nov 2017 19:03:47 -0600
Organization: JSA Research & Innovation
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Date: 2017-11-15T19:03:47-06:00
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"reinert" <reinkor@gmail.com> wrote in message 
news:eba98c11-5a28-476d-b508-96e73469a256@googlegroups.com...
>Letting barriers depend on external data = asking for trouble?

Yes. Barriers are only checked after some other protected action completes 
(that might change the *internal* data). There is no attempt to check for 
changes in external data.

                       Randy.