title: Adding elements from two threads to the same ConcurrentLinkedQueue at the same time
body: <p>Assuming that Thread A tries to add an element to a ConcurrentLinkedQueue, and at the same time Thread B tries to add a different element to the same  ConcurrentLinkedQueue.  </p>
  
  <p>Will these two items be added to the queue, or can I have concurrency problem with that (let's say, that it is possible that only one will be inserted)?<br>
  I know that this queue is thread-safe, however I don't know if it means that I can assume that this method is also safe when I call it twice at the same time from different threads.           </p>
  
  <p>If it doesn't, maybe the method put/offer will be safe for this case?</p>