Date: Tue, 03 Jun 1997 21:01:14 +0100 From: Brian Somers <brian@awfulhak.org> To: Bill Fenner <fenner@parc.xerox.com> Cc: cvs-etc@freebsd.org, cvs-all@freebsd.org, cvs-committers@freebsd.org Subject: Re: cvs commit: src/etc rc Message-ID: <199706032001.VAA00608@awfulhak.demon.co.uk> In-Reply-To: Your message of "Tue, 03 Jun 1997 08:32:05 PDT." <97Jun3.083213pdt.177489@crevenia.parc.xerox.com>
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> Don't forget that if you use a flock(), there is a race condition when
> two seperate processes are checking to see if the daemon is running
> where one process may think it's not running (its attempt to lock the
> pidfile succeeds) and the other process thinks it's running (since its
> attempt fails since the first process hadn't released its lock yet).
Not true. The lock is a write lock. The check is a read lock. A
read lock won't affect another read lock.
Remember, you can do just about anything, given the ability to both
read lock and write lock.
> Bill
>
--
Brian <brian@awfulhak.org>, <brian@freebsd.org>
<http://www.awfulhak.org>;
Don't _EVER_ lose your sense of humour....
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