Path: utzoo!attcan!uunet!mailrus!ncar!tank!gargoyle!chinet!john
From: john@chinet.chi.il.us (John Mundt)
Newsgroups: comp.unix.wizards
Subject: Re: Message queues (System V)
Keywords: delete private queues
Message-ID: <1990Mar6.144242.596@chinet.chi.il.us>
Date: 6 Mar 90 14:42:42 GMT
References: <7114@lynx.UUCP>
Reply-To: john@chinet.chi.il.us (John Mundt)
Distribution: na
Organization: Chinet - Chicago Public Access UNIX
Lines: 20

In article <7114@lynx.UUCP> m5@lynx.uucp (Mike McNally) writes:
>I have recently discovered that message queues with a key of IPC_PRIVATE are
>not implicitly removed when all using tasks exit. 
>  ...
>I realize that it would be "nice" to do a msgctl() to get rid of the thing,
>but it seems a little user-hostile for the kernel to not do this automatically.
>Is any purpose served by keeping the queue around?
>
>(I found this out, BTW, on our Interactive Systems 386 system.)
>

You'll find the same thing on AT&T's 3b2 line using V3.2.  I carefully
remove the queue when a user exits, but when the program was in develop-
ment, and crashed several times, the queue stayed there.  :-(  It would
be nice if the kernel did clean up after a process died.
-- 
---------------------
John Mundt   Teachers' Aide, Inc.  P.O. Box 1666  Highland Park, IL
john@admctr.chi.il.us *OR* fred@teacha.chi.il.us
(312) 998-5007 (Day voice) || -432-8860 (Answer Mach) && -432-5386 Modem