locking via lockfiles in posix systems. API:

lock, err = lfs.lock_dir(path, [seconds_stale])
  Creates a lockfile (called lockfile.lfs) in <path> if it does not
  exist and returns the lock. If the lock already exists checks it
  it's stale, using the second parameter (default for the second
  parameter is INT_MAX, which in practice means the lock will never
  be stale. To free the the lock call lock:free().
  In case of any errors it returns nil and the error message. In
  particular, if the lock exists and is not stale it returns the
  "File exists" message.

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