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-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,bc1361a952ec75ca
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 2001-08-02 11:31:25 PST
Path: 
 archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!iad-peer.news.verio.net!news.verio.net!iad-read.news.verio.net.POSTED!kilgallen
From: Kilgallen@eisner.decus.org.nospam (Larry Kilgallen)
Newsgroups: comp.lang.ada
Subject: Re: How to make Ada a dominant language
Message-ID: <a3xjmBoPab$s@eisner.encompasserve.org>
References: <bebbba07.0107292308.d1192fc@posting.google.com>
 <slrn9ma7qp.nac.randhol@kiuk0156.chembio.ntnu.no>
 <3B6555ED.9B0B0420@sneakemail.com> <9k3l9r$10i2$1@pa.aaanet.ru>
 <3B656345.64AB603A@sneakemail.com> <9k3oa1$2qg8$1@pa.aaanet.ru>
 <VppeHMXUqTyW@eisner.encompasserve.org> <3B657715.7EC592D9@sneakemail.com>
 <slrn9mb1cv.70f.randhol@kiuk0156.chembio.ntnu.no>
 <3B659726.33E301CA@san.rr.com> <9kae23$38a$1@news-central.tiac.net>
 <UJda7.15085$ar1.50987@www.newsranger.com> <3B697B8B.175A87D8@san.rr.com>
Organization: LJK Software
Date: 2 Aug 2001 14:30:59 -0500
NNTP-Posting-Host: 216.44.122.34
X-Complaints-To: abuse@verio.net
X-Trace: iad-read.news.verio.net 996777062 216.44.122.34 (Thu,
 02 Aug 2001 18:31:02 GMT)
NNTP-Posting-Date: Thu, 02 Aug 2001 18:31:02 GMT
Xref: archiver1.google.com comp.lang.ada:11119
Date: 2001-08-02T14:30:59-05:00
List-Id: <comp.lang.ada>

In article <3B697B8B.175A87D8@san.rr.com>, Darren New <dnew@san.rr.com> writes:
> Ted Dennison wrote:
>> Unix is actually the odball
>> here, probably due to its C heritage.
> 
> And when you get right down to it, OS calls are never standard calls
> unless your processor supports changing privledges as part of a "normal"
> call. (Or unless your OS makes no such privledge distinction, of
> course.)

In VMS, the OS calls made by user mode programs are standard calls.
A portion of the operating system then takes that call (in user mode)
and does one of the following:

	traps to kernel mode
	traps to executive mode
	completes the work in user mode

after either of the first two, this user mode code may wait for
completion of the system service.  Since the waiting is done in
user mode, the user can interrupt it can request image rundown
or take a more innocuous action.

When discussing the universe of operating systems, it is best to
avoid use of the word "never".