  <p>Attempts to place an advisory lock starting from the current position marker up to the indicated byte count. This function will throw an exception if the file is already locked, but will not block the current thread.
- parameter byteCount: The number of bytes to lock
- throws: <code>PerfectError.FileError</code></p>

                      </div>
                      <div class="declaration">
                        <h4>Declaration</h4>
                        <div class="language">
                   