, support may
 entail some form of internal locking.  Thus the methods are not
 strictly guaranteed to be non-blocking --
 a thread may block transiently before performing the operation.

 <p>Instances of classes
 <code><a href="../../../../../reference/java/util/concurrent/atomic/AtomicBoolean.html">AtomicBoolean</a></code>,
 <code><a href="../../../../../reference/java/util/concurrent/atomic/AtomicInteger.html">AtomicInteger</a></code>,
 <code><a href="../../../../../reference/java/util/concurrent/atomic/