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Date: Sat, 4 Nov 2000 20:52:19 -0800 (PST)
From: dean gaudet <dean-list-linux-kernel@arctic.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
cc: Andrew Morton <andrewm@uow.edu.au>, kumon@flab.fujitsu.co.jp,
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Subject: Re: [PATCH] Re: Negative scalability by removal of  lock_kernel()?(Was:Strange
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On Sat, 4 Nov 2000, Alan Cox wrote:

> > sysv semaphores have a very unfortunate negative feature -- if the admin
> > kill -9's the server (impatient admins do this all the time) then you end
> > up leaving a semaphore lying around.  sysvsem don't have the usual unix
> 
> Umm they have SEM_UNDO. Its a case of deeper magic

we use SEM_UNDO, that's not quite what i was worrying about.  i was
worrying about leaving a stale semaphore in the global semaphore table.

IPC_RMID causes the semaphore to be destroyed immediately, rather than
after all the users are done.

-dean

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