code: def _createCacheLockFile(self, tempCacheDir):
          
          # The nlink threshold is setup along with the first instance of the cache class on the
          # node. It needs the cache dir to sniff link count for files form the job store.
          self.setNlinkThreshold(tempCacheDir)
          # Get the free space on the device
          freeSpace, _ = getFileSystemSize(tempCacheDir)
          # Create the cache lock file.
          open(os.path.join(tempCacheDir, os.path.basename(self.cacheLockFile)), 'w').close()
          # Setup the cache state file
          personalCacheStateFile = os.path.join(tempCacheDir,
                                                os.path.basename(self.cacheStateFile))
          # Setup the initial values for the cache state file in a dict
          cacheInfo = self._CacheState({
              'nlink': self.nlinkThreshold,
              'attemptNumber': self.workflowAttemptNumber,
              'total': freeSpace,
              'cached': 0,
              'sigmaJob': 0,
              'cacheDir': self.localCacheDir,
              'jobState': {}})
          cacheInfo.write(personalCacheStateFile)
docs: Create the cache lock file file to contain the state of the cache on the node.
  
          :param str tempCacheDir: Temporary directory to use for setting up a cache lock file the
                 first time.