From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Thread: 103376,3e11ef4efc073f6b
X-Google-Attributes: gid103376,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news1.google.com!postnews.google.com!w1g2000prk.googlegroups.com!not-for-mail
From: christoph.grein@eurocopter.com
Newsgroups: comp.lang.ada
Subject: Re: requeue with abort and timed call
Date: Sun, 28 Dec 2008 07:53:44 -0800 (PST)
Organization: http://groups.google.com
Message-ID: <84c56781-1cb1-4d86-be14-e66fc9fdade6@w1g2000prk.googlegroups.com>
References: 
 <2a60b044-6a5c-4ce6-93e6-6eeefc8806c3@l33g2000pri.googlegroups.com>
	<1f6rcb1qwt7vx.1mckzyk9ucohf.dlg@40tude.net>
NNTP-Posting-Host: 91.13.202.109
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
X-Trace: posting.google.com 1230479624 27064 127.0.0.1 (28 Dec 2008 15:53:44
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Sun, 28 Dec 2008 15:53:44 +0000 (UTC)
Complaints-To: groups-abuse@google.com
Injection-Info: w1g2000prk.googlegroups.com; posting-host=91.13.202.109;
	posting-account=rmHyLAoAAADSQmMWJF0a_815Fdd96RDf
User-Agent: G2/1.0
X-HTTP-UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.5)
	Gecko/2008120122 Firefox/3.0.5,gzip(gfe),gzip(gfe)
Xref: g2news1.google.com comp.lang.ada:3099
Date: 2008-12-28T07:53:44-08:00
List-Id: <comp.lang.ada>

I do not see a problem with aborting. Why should the entry call be
aborted?

After elaboration of the declaration part of Req, at the begin
keyword, the task T starts and is blocked at entry Original_Call.
Concurrently the main task proceeds to the select statement, where it
waits at most 1 s for the rendezvous to take place. Since T is already
waiting there, the rendezvous takes place, so the "or delay" is never
executed. The rendezvous terminates after 3 s, and T goes into the
infinte loop.

The main task, the master of T, now waits for T to terminate (which
will never happen), so the process never ends.

This is not an asynchronous select:

  select
    delay ...;
  then abort
    Original_Call;
  end select;