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Subject:	Re: cygserver cleanup thread
From:	bertrand marquis <bertrand DOT marquis AT sysgo DOT com>
To:	cygwin <cygwin AT cygwin DOT com>
In-Reply-To:	<20040811085049.GA1819@cygbert.vinschen.de>
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Organization:	SYSGO AG
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Date:	11 Aug 2004 10:59:12 +0200
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Le mer 11/08/2004 à 10:50, Corinna Vinschen a écrit :
> On Aug 11 10:13, bertrand marquis wrote:
> > Hello,
> > 
> > i'm making a program using shared memory and as a consequence i need to
> > use the cygserver. But when i close my program the ipcs give me this
> > output:
> > 
> > $ ipcs -ma
> > Shared Memory:
> > T     ID               KEY        MODE       OWNER    GROUP  CREATOR  
> > CGROUP NATTCH  SEGSZ  CPID  LPID    ATIME    DTIME    CTIME
> > m 262144                    0 --rw-------      bma     Kein      bma    
> > [...]
> > 
> > In fact all the shared memory i used is still there and is used by
> > nobody (NNATCH 0). I thought that the cleanup thread of the cygserver
> > was supposed to clean those but i have to remove them myself. Is this a
> > normal behavior ? Is there something to configure in cygserver to clean
> > those ?
> 
> This is normal behaviour.  SYSV IPC is designed to keep the IPC elements
> intact even if no process is accessing them.  If you want to get rid of
> them, then you have to do this by using the appropriate IPC_RMID control
> call:
> 
> 	msgctl (msgid, IPC_RMID, NULL);
> 	semctl (semid, 0, IPC_RMID);
> 	shmctl (shmid, IPC_RMID, NULL);
> 

Thank you, i will try to find a way to call shmctl from the last thread
running.

> If you're creating an application which needs shared memory only on
> runtime, which should disappear when the last application using it
> exits, consider to use simple mmap calls.  It's way easier than having
> to run cygserver.
> 
> 
> Corinna


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