* thread_tools.c: add Queue#close(exception=false) and

  SizedQueue#close(exception=false).
  [Feature #10600]
  Trying to deq from a closed empty queue return nil
  if exception parameter equals to false (default).
  If exception parameter is truthy, it raises
  ClosedQueueError (< StopIteration).
  ClosedQueueError inherits StopIteration so that you can write:
    loop{ e = q.deq; (using e) }
  Trying to close a closed queue raises ClosedQueueError.
  Blocking threads to wait deq for Queue and SizedQueue will be
  restarted immediately by returning nil (exception=false) or
  raising a ClosedQueueError (exception=true).
  Blocking threads to wait enq for SizedQueue will be
  restarted by raising a ClosedQueueError immediately.
  The above specification is not proposed specification, so that
  we need to continue discussion to conclude specification this
  method.
* test/thread/test_queue.rb: add tests originally written by
  John Anderson and modify detailed behavior.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51699 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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