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Annotation of 43BSDTahoe/ucb/ex/FLOCK_README, revision 1.1

1.1     ! root        1: Also added to vi is support for advisory file locking. Vi now assigns
        !             2: a sharable lock when reading files, and an exclusive lock when editting
        !             3: or writing on files.
        !             4: 
        !             5: This means that if the file is open by another editor, vi will warn
        !             6: the user of the conflict. Multiple readers of the same file are
        !             7: of course never warned, but any attempt to modify the file from
        !             8: vi will produce an error message. The error message can be
        !             9: bypassed of course with "w!" et al.
        !            10: 
        !            11: Note that seperate locks are kept on alternate and original files
        !            12: used within vi, so all files referenced by vi are safe.
        !            13: 
        !            14: The main motivation of this is to allow "safe" use of possibly
        !            15: backgrounded vi's, but it is in general quite useful on a busy system.
        !            16: 
        !            17: This also obviates things like vipw.
        !            18: 
        !            19: The changes work on 4.2 as well, but watch out for flock system bugs.
        !            20: 
        !            21:        Bill Jolitz
        !            22:        Symmetric
        !            23:        [email protected]

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