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-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,8ddc02527645a844
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 2003-03-31 10:35:06 PST
Path: 
 archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news.uchicago.edu!newsfeed.cs.wisc.edu!newshub.sdsu.edu!logbridge.uoregon.edu!msunews!not-for-mail
From: "Chad R. Meiners" <crmeiners@hotmail.com>
Newsgroups: comp.lang.ada
Subject: Re: tasking with GNAT 3.14p on windows
Date: Mon, 31 Mar 2003 13:30:50 -0500
Organization: Michigan State University
Message-ID: <b6a1nm$1ogu$1@msunews.cl.msu.edu>
References: <Xns934E8C5D49EFBerndSpechtgmxcom@62.153.159.134>
 <3e87f4e2$1@epflnews.epfl.ch> <7vu1djubmk.fsf@vlinux.voxelvision.no>
 <MPG.18f2a01651aa20aa9896cb@News.CIS.DFN.DE>
NNTP-Posting-Host: arctic.cse.msu.edu
X-Priority: 3
X-MSMail-Priority: Normal
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106
Xref: archiver1.google.com comp.lang.ada:35834
Date: 2003-03-31T13:30:50-05:00
List-Id: <comp.lang.ada>


"Jano" <nono@celes.unizar.es> wrote in message
news:MPG.18f2a01651aa20aa9896cb@News.CIS.DFN.DE...
> trying to know the behavior with blocking I/O. In XP with -gnatP, you
> get indefinite wait for user input, but if more than 10 seconds has
> passed when you hit enter, you get also the "aborted" print.
>
> Is that expected behavior? Gnat docs say that polling implements calls
> in each loop iteration / function call. Should I assume that if you
> haven't loops / calls, abort will never work properly?

It seems like reasonable behavior.  System calls are not guaranteed to be
abortable.

> I feel nevertheless very unsafe using anything else than trivial tasks
> in NT. The priority system of NT messes things greatly out of
> real_time_class, and that, for example, is never pointed in Gnat docs
> (in my knowledge).

NT is not a real time operating system.  The task support on NT is not
broken; your understanding of Ada tasking is broken. ;)  It is very easy to
write system dependent tasking code.  I have written several robust
multi-tasking windows applications.  You just have to understand how to
implement your os calls so that they play well with tasking.

> Also, the faulty ceiling_priority model for protected objects is
> mentioned or not? I can't remember...

If you don't know then why are spreading FUD about tasking on NT?