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Basic inter-process locks
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The zc.lockfile package provides a basic portable implementation of
interprocess locks using lock files.  The purpose if not specifically
to lock files, but to simply provide locks with an implementation
based on file-locking primitives.  Of course, these locks could be
used to mediate access to *other* files.  For example, the ZODB file
storage implementation uses file locks to mediate access to
file-storage database files.  The database files and lock file files
are separate files.

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