title: making path finding algorithm with multi-thread
body: <p>I'd like to make algorithm that works like this image </p>
  
  <p><a href="http://i.imgur.com/lntXzuF.gif" rel="nofollow">http://i.imgur.com/lntXzuF.gif</a></p>
  
  <p>I've learned A*, Dijkstra, Breadth-First-Search, and Best-First-Search with SINGLE thread.</p>
  
  <p>is there any reference or algorithm that I can refer to?</p>