Mailing-List: contact cygwin-help AT sourceware DOT cygnus DOT com; run by ezmlm
List-Subscribe: <mailto:cygwin-subscribe AT sources DOT redhat DOT com>
List-Archive: <http://sources.redhat.com/ml/cygwin/>
List-Post: <mailto:cygwin AT sources DOT redhat DOT com>
List-Help: <mailto:cygwin-help AT sources DOT redhat DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender: cygwin-owner AT sources DOT redhat DOT com
Delivered-To: mailing list cygwin AT sources DOT redhat DOT com
Date: Tue, 6 Nov 2001 14:05:22 +0100
From: Corinna Vinschen <cygwin AT cygwin DOT com>
To: cygwin <cygwin AT cygwin DOT com>
Subject: Re: 1.1.3: mmap() returns unusable memory segments: segm fault
Message-ID: <20011106140522.H2965@cygbert.vinschen.de>
Mail-Followup-To: cygwin <cygwin AT cygwin DOT com>
References: <20011106114642 DOT D2965 AT cygbert DOT vinschen DOT de> <Pine DOT WNT DOT 4 DOT 33 DOT 0111061305400 DOT 178-101000 AT erde DOT concept DOT de>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.2.5i
In-Reply-To: <Pine.WNT.4.33.0111061305400.178-101000@erde.concept.de>; from lothar@concept.de on Tue, Nov 06, 2001 at 01:20:30PM +0100

On Tue, Nov 06, 2001 at 01:20:30PM +0100, Lothar Linhard wrote:
> Hi Corinna,
> 
> thanks, I've installed 1.3.4-2 and can verify that the problem
> is fixed.  I'm still enthusiastic about your response time.
> 
> However, here is another problem I have detected:
> 
>   UNIX allows to do one unmap on memory space mapped by
>   several continous mmaps.  Cygwin's munmap doesnt.  I can

It does as long as either the mapped object is a real file or
in case of anonymous mapping the mapped mem space consists of
fractions of 64K.  In your example, the mem space is just too big
to allow that behaviour in the current implementation.  It's
probably possible to get your testcase working as well.  The mem
objects are maintained in a linked list.   The whole stuff
is in mmap.cc in the cygwin sources.  Feel free to send a patch.

Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/