title: is tbb::thread still in TBB-4.x?
body: <p>I have just read the document of the latest TBB's documents.
  I can't find any information about tbb::thread, but I saw some information about mutex.</p>
  
  <p>BTW, if TBB-4.x have thread library please help me find the resources of using tbb threads.
  Please don't recommend the official documents, they are lack of examples. </p>
  
  <p>thanks!  </p>