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: a07f3367d7,41c5dc8789baf2f3
X-Google-Attributes: gida07f3367d7,public,usenet
X-Google-NewGroupId: yes
X-Google-Language: ENGLISH,ASCII-7-bit
Received: by 10.180.105.2 with SMTP id gi2mr70416wib.4.1348190011776;
        Thu, 20 Sep 2012 18:13:31 -0700 (PDT)
Path: 
 q11ni3492521wiw.1!nntp.google.com!feeder1.cambriumusenet.nl!feed.tweaknews.nl!85.12.40.131.MISMATCH!xlned.com!feeder3.xlned.com!news.astraweb.com!border5.a.newsrouter.astraweb.com!border2.nntp.ams.giganews.com!border3.nntp.ams.giganews.com!border1.nntp.ams.giganews.com!nntp.giganews.com!newsreader4.netcologne.de!news.netcologne.de!newsfeed.straub-nv.de!news.mixmin.net!aioe.org!.POSTED!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Understanding Visibility
Date: Mon, 17 Sep 2012 23:19:14 +0200
Organization: cbb software GmbH
Message-ID: <82c5e4984vf2$.1snxa3p5dlpxf$.dlg@40tude.net>
References: <f64b145d-f2ad-470d-a6fb-dd3d666d481e@googlegroups.com>
Reply-To: mailbox@dmitry-kazakov.de
NNTP-Posting-Host: 9A8bJrx4NhDLcSmbrb6AdA.user.speranza.aioe.org
Mime-Version: 1.0
X-Complaints-To: abuse@aioe.org
User-Agent: 40tude_Dialog/2.0.15.1
X-Notice: Filtered by postfilter v. 0.8.2
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Date: 2012-09-17T23:19:14+02:00
List-Id: <comp.lang.ada>

On Mon, 17 Sep 2012 13:42:27 -0700 (PDT), tonyg wrote:

> I needed to log some stuff from several tasks in one program. So I wrote a
> little logging package. I used a package containing several
> text_io.file_types followed by a protected object to make sure the file
> operations were not interfered with. 

It is an error to do I/O from a protected action, since I/O is a
potentially blocking operation.

You should either use a task (AKA monitor) or else a protected object
implementing a mutex (using a controlled holder object, of course).

> However when things were passed through to inside the protected object I
> found that the file was not taking the information being passed to it. Can
> anyone explain this to me, as I think the file should be visible.

You should always post a working code illustrating the problem.

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