From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: From: Brantley Coile To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> In-Reply-To: <9d18311cc0380c7f862a7f81c288a5fc@terzarima.net> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (Apple Message framework v929.2) Date: Wed, 12 Nov 2008 14:55:00 -0500 References: <9d18311cc0380c7f862a7f81c288a5fc@terzarima.net> Subject: Re: [9fans] Do we have a catalog of 9P servers? Topicbox-Message-UUID: 3fb55c2c-ead4-11e9-9d60-3106f5b1d025 That explains why IBM's MVS didn't have locking at all. One would conclude from that fact that locking isn't required to do even serious business applications. Brantley On Nov 12, 2008, at 2:58 PM, Charles Forsyth wrote: >> It's not POSIX byte-range >> read- or write-locking per fcntl, but it's not clear to me how often >> that's actually useful. > > they aren't. i wrote a paper about it many years ago, when helping > to implement > a database system. in short, you can't rely on them for either scale > or properties, > so in any serious application you'll do it yourself anyway. > >