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From: "Sergey Koshcheyev" <serko84@hotmail.com>
Newsgroups: comp.lang.ada
Subject: Re: tasks, protected types and entries
Date: Sun, 17 Mar 2002 17:49:36 +0100
Organization: Czech Technical University
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Date: 2002-03-17T17:49:36+01:00
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"Jim Rogers" <jimmaureenrogers@worldnet.att.net> wrote in message
news:3C94BA62.3050102@worldnet.att.net...
> To quote from "Ada as a Second Language" page 860:
>
> "A guard is a construct of the form
>     when condition =>
> that may precede some or all the alternatives of a selective accept.
> A guard has the same form as a barrier in a protected-type entry
> body (..) and plays a similar role."
>
> In short, yes, an entry barrier on a protected object does limit
> access to the protected object. A guard on a task's selective
> accept provides conditions for completion of a rendezvous.

By the way, what is the difference between a procedure X and an "entry X
when True" in a protected object? I remember that the "entry when True" was
used once in John Barnes' book, but I couldn't find an explanation of the
difference.

Sergey.