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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>
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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
>
>
>
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