Maybe I'm missing something here, but I didn't see a way
to specify an exclusive lock on a file.

I realize such a feature would probably require native OS
support but that shouldn't be a problem since most OSs
support shared/exclusive access to files.

Specifically, I'd like to be able to specify a file's access
permissions as a combination of READ/WRITE and SHARED/EXCLUSIVE
for both my process and any other processes that might try to
access the file:

My Process Permissions       Permissions for Others
----------------------       ----------------------
READ_SHARED                  READ_ONLY
READ_SHARED                  READ_WRITE
READ_EXCLUSIVE               none
WRITE_SHARED                 READ_ONLY
WRITE_SHARED                 READ_WRITE
WRITE_EXCLUSIVE              none
READ_WRITE_SHARED            READ_ONLY
READ_WRITE_SHARED            READ_WRITE
READ_WRITE_EXCLUSIVE         none
(Review ID: 36148)
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