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2 locsk

    2.1	Lock Algorithm

    FML uses flock(2) in default. If you use flock(2), set

    	$USE_FLOCK    = 1; (default 1)

    If flock(2) does not work on your OS, set

    	$USE_FLOCK    = 0;

    to use a lock based on link(2). This algorithm uses lockfiles whereas
    flock(2) is only in kernel.  If the machine shutdowns or reboots
    suddenly, temporary lock files may be left in the lock spool. If
    exists, please remove them.

    2.2	remove lockfiles when lock is broken?

    remove all lockfiles if fml processes not run.

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