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!news3.google.com!feeder3.cambrium.nl!feeder1.cambrium.nl!feed.tweaknews.nl!amsnews11.chello.com!newsfeed01.chello.at!newsfeed.arcor.de!newsspool2.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>
 <k0v7ahb8yuxg.1coeigri9pb7z$.dlg@40tude.net> <m2sl6pvwoj.fsf@mac.com>
 <ldd1ybusjoi6$.2vzn30npe6xa$.dlg@40tude.net>
 <1186938729.414350.288620@d55g2000hsg.googlegroups.com>
Date: Sun, 12 Aug 2007 20:03:32 +0200
Message-ID: <eoz7rhdkjpvf.13wdkcfdj1tri$.dlg@40tude.net>
NNTP-Posting-Date: 12 Aug 2007 20:03:24 CEST
NNTP-Posting-Host: 27b75453.newsspool1.arcor-online.net
X-Trace: 
 DXC=eIk<U;8XgB;^cW`WBF>WQ<ic==]BZ:af>4Fo<]lROoR14nDHegD_]R534Q6J8mdIl7DNcfSJ;bb[5IRnRBaCd<M>cAEZhN`K\M0BdQ_M>fBSc<
X-Complaints-To: usenet-abuse@arcor.de
Xref: g2news2.google.com comp.lang.ada:1412
Date: 2007-08-12T20:03:24+02:00
List-Id: <comp.lang.ada>

On Sun, 12 Aug 2007 10:12:09 -0700, shaunpatterson@gmail.com wrote:

> I just wanted the two threads to run quitely in the
> background.
>
>  However, one thread is reading from sockets...
> and that thread is preventing the other task from running.

Reading from socket does not block anything, provided that the tasks are
mapped to native threads.
 
> I'd have to check, but I was SURE I set the GNAT Sockets to
> non-blocking... which (I assume) would allow the other thread
> to run.

You should check that tasks are mapped to OS threads. AFAIK, this is the
default when you are using GNAT. If not, then all tasks are scheduled by
Ada RTL from one system thread and consequently I/O would block all of
them. See

http://gcc.gnu.org/onlinedocs/gcc-3.4.6/gnat_ugn_unw/Choosing-between-Native-and-FSU-Threads-Libraries.html

With native threads you can safely do blocking socket I/O without any
problems. Otherwise, you should use only asynchronous I/O.

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