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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