X-Recipient: archive-cygwin AT delorie DOT com
X-Spam-Check-By: sourceware.org
Date: Fri, 12 Jun 2009 21:12:12 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: 1.7.0 sem_open
Message-ID: <20090612191212.GH5039@calimero.vinschen.de>
Reply-To: cygwin AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
References: <94b5b62d0906112150g473b49fao41f95c3a1c6e6014 AT mail DOT gmail DOT com> <20090612084932 DOT GC5039 AT calimero DOT vinschen DOT de> <94b5b62d0906121156m197fc1f4j3c83c3796c741de4 AT mail DOT gmail DOT com>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <94b5b62d0906121156m197fc1f4j3c83c3796c741de4@mail.gmail.com>
User-Agent: Mutt/1.5.19 (2009-02-20)
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Precedence: bulk
List-Id: <cygwin.cygwin.com>
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

On Jun 12 15:56, Pedro Izecksohn wrote:
>   Corinna Vinschen read my mind.
> 
> > What is semtool?
> 
> semtool - A utility for tinkering with semaphores
> 
> USAGE:  semtool  (c)reate <semcount>
>                  (l)ock <sem #>
>                  (u)nlock <sem #>
>                  (d)elete
>                  (m)ode <mode>
> 
>   It comes in some package available through the Cygwin's installer. I

Uh, cygutils.  I didn't know that.

> do not understand how to use it.

It is unrealted to what you're doing.  It uses XSI semaphores which
require a running cygserver process.  See the User's Guide.  Your
example code is using POSIX sempahores.

> >>   I wrote an example that works on Jaunty on x86-64 but not on Cygwin:
> >> http://www.izecksohn.com/pedro/c/semaphores/semaphores.tar.gz
> >
> > Works for me.
> 
>   The persistence of the semaphore also works for you?
> 
>   For me, using the unpatched version, (not the CVS version), the
> persistence works some times only. At other times the semaphore
> disappears with the Control c.

The semaphore is backed by a file on disk.  If you don't call
sem_unlink one way or the other, the semaphore persists.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/