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=-0.3 required=5.0 tests=BAYES_00,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: 103376,126ce244c524526b
X-Google-Attributes: gid103376,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news2.google.com!news2.google.com!news.glorb.com!newsfeed.kamp.net!newsfeed.kamp.net!newsfeed.freenet.de!bolzen.all.de!newsfeed.ision.net!newsfeed2.easynews.net!ision!newsfeed.arcor.de!newsspool1.arcor-online.net!news.arcor.de.POSTED!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Tasking issues
Newsgroups: comp.lang.ada
User-Agent: 40tude_Dialog/2.0.15.1
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Reply-To: mailbox@dmitry-kazakov.de
Organization: cbb software GmbH
References: <1186851804.567302.223160@q4g2000prc.googlegroups.com>
 <L_zvi.420569$p47.372414@bgtnsc04-news.ops.worldnet.att.net>
Date: Sun, 12 Aug 2007 11:43:55 +0200
Message-ID: <se8lag9odx40$.1ko5kq7eszy2u.dlg@40tude.net>
NNTP-Posting-Date: 12 Aug 2007 11:43:47 CEST
NNTP-Posting-Host: 203be16b.newsspool4.arcor-online.net
X-Trace: 
 DXC=2MSJecgIQ:jg`45cDR8l?o4IUK<Cl32<a4Fo<]lROoRa^YC2XCjHcbi6`i52I5WFohDNcfSJ;bb[eIRnRBaCd<MncAEZhN`K\M`Y9[<R^k2Njn
X-Complaints-To: usenet-abuse@arcor.de
Xref: g2news2.google.com comp.lang.ada:1407
Date: 2007-08-12T11:43:47+02:00
List-Id: <comp.lang.ada>

On Sun, 12 Aug 2007 09:00:27 GMT, anon wrote:

>    -- abort tasks.  But because get_name may be in the process of 
>    -- obtaining data from standard_input. it may require a CR/LF 
>    -- to be entered to fully abort the 'get_name' task.

No, it should abort Get_Line immediately. The operations deferring abort
are listed in 9.8(5).

>  abort get_name ;

Aborting tasks is a bad idea, almost always. If you have some shared
objects which states might be changed outside an abort-deferred operation,
then aborting will corrupt them. It is not always possible to do everything
from a protected action (which is abort-deferred).

Though asynchronous transfer of control is very much like abort, one can
limit the scope of what gets aborted.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de