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Date:      Thu, 26 Aug 1999 09:09:33 +0930
From:      Greg Lehey <grog@lemis.com>
To:        Thomas David Rivers <rivers@dignus.com>
Cc:        bee@wipinfo.soft.net, hackers@FreeBSD.ORG
Subject:   Re: Mandatory locking?
Message-ID:  <19990826090933.T83273@freebie.lemis.com>
In-Reply-To: <199908251005.GAA95394@lakes.dignus.com>; from Thomas David Rivers on Wed, Aug 25, 1999 at 06:05:11AM -0400
References:  <000301beeea6$1ea898a0$88291fac@wipro.tcpn.com> <199908251005.GAA95394@lakes.dignus.com>

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On Wednesday, 25 August 1999 at  6:05:11 -0400, Thomas David Rivers wrote:
>> All the files under Tandem's NSK has mandatory locking. The file cannot be
>> opened if another process has it opened. some thing like
>>
>>   * if the file is opened for reading, any one can open it for
>>     reading but opening for writing gives error
>>   * if the file is open for writing, it can't be opened for
>>     read/write
>>   * if the process holding the file is killed, the lock is gone
>>   * it is possible to get the pid of the process(es) which has
>>     a given file open (like which process has file "xyz" open?
>>     kind of query). btw, is there any way to get this info now in FBSD?
>
>  This sounds interesting...
>
>  But - aren't there NFS issues?  I mean, in stateless access to
>  a file - how do you know if the process holding the file is killed
>  if it's remote?

NSK is a prorietary operating system ("NonStop Kernel", previously
known as Guardian, previously known as TOS), not UNIX.  There is no
NFS, and there is no distinction between network access and local
access: all goes over the message system.  When a file is closed, its
locks are released.

Greg
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