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,FREEMAIL_FROM
	autolearn=ham autolearn_force=no version=3.4.4
X-Google-Thread: 103376,ff7d8060c8210f40
X-Google-Attributes: gid103376,public
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news2.google.com!news4.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!newsfeed00.sul.t-online.de!t-online.de!newsfeed.icl.net!newsfeed.arcor.de!newsspool4.arcor-online.net!news.arcor.de.POSTED!not-for-mail
Newsgroups: comp.lang.ada
Subject: Re: real_time.clock is not monotonic
From: Georg Bauhaus <bauhaus@arcor.de>
In-Reply-To: <1172074608.834181.198540@j27g2000cwj.googlegroups.com>
References: <1172074608.834181.198540@j27g2000cwj.googlegroups.com>
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
Organization: #
Message-ID: <1172087184.5771.3.camel@localhost>
Mime-Version: 1.0
X-Mailer: Evolution 2.6.1 
Date: Wed, 21 Feb 2007 20:46:24 +0100
NNTP-Posting-Date: 21 Feb 2007 20:44:26 CET
NNTP-Posting-Host: 635be15c.newsspool2.arcor-online.net
X-Trace: 
 DXC=0<aVVeVVj6ZmG86`U=_nC_A9EHlD;3YcR4Fo<]lROoRQ8kF<OcfhCO[No>_aWM7ifQ=kbmW`a1fGWC`2T@AUZfC[5EO0AT8fcn^
X-Complaints-To: usenet-abuse@arcor.de
Xref: g2news2.google.com comp.lang.ada:9377
Date: 2007-02-21T20:44:26+01:00
List-Id: <comp.lang.ada>

On Wed, 2007-02-21 at 08:16 -0800, frederic.ormancey@atosorigin.com
wrote:
> in Linux implementation of Gnat RunTime, Monotonic_Clock is a
> single rename of calendar.clock, which use gettimeofday() system
> call !!!!
> 
> I'll alert Gnat community with this bad implementation, as
> gettimeofday() is affected by NTP and others date adjustements. in
> LRM, Ada.Real_Time.Clock shall be monotonic => Gnat runtime is not
> compliant

What is a possible alternative when making calls to a garden
variety Linux kernel?  Is there real-time POSIX support in
"normal" Linux based systems?


> This bug was detected with 3.15p Linux version, but implementation is
> still the same with latest source of gnat runtime (s-osprim.adb).
> 
> Did someone have a solution for this problem ? another implementation
> using a Linux monotonic clock ?