Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sources.redhat.com/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sources.redhat.com/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
Date:	Thu, 19 Jun 2003 12:39:46 -0600
From:	Mark Paulus <mark DOT paulus AT mci DOT com>
Subject:	Re: cygipc semaphores not persistent?
In-reply-to:	<bcsm25$vbd$1@main.gmane.org>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Message-id:	<0HGQ00JM8RU99X@pmismtp01.wcomnet.com>
MIME-version:	1.0
Priority:	Normal

Are you running the ipcdaemon process?  At one time
the cygipc libraries required the ipcdaemon process
to manage the global objects.  I thought I read something
that the ipc-daemon is going away, and being incorporated
into the cygwin architecture, but I did not gather that it had
happened yet.  That may be a misunderstanding on my
part however.

On Thu, 19 Jun 2003 11:49:30 -0400, Joe Buehler wrote:

>I am attempting to use cygipc for its semaphore functionality
>in porting some existing UNIX code.
>
>It would appear that semaphores are not persistent?
>
>The code depends on the UNIX semantic of a semaphore being a global
>system object that exists regardless of whether any processes are
>currently using it.
>
>I have processes coming and going, using the semaphore to mediate
>access to a disk-based queue.  I have been debugging the code,
>and it appears that the semaphore is destroyed when no process has
>it open?
>-- 
>Joe Buehler
>
>
>
>--
>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/
>




--
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/

- Raw text -