title: ctx parameter in multiprocessing.Queue
body: <p>I´m trying to use a Queue from the multiprocessing.Queue module.
  The Implementation (<a href="https://docs.python.org/3.4/library/multiprocessing.html#exchanging-objects-between-processes" rel="noreferrer">https://docs.python.org/3.4/library/multiprocessing.html#exchanging-objects-between-processes</a>) uses</p>
  
  <pre><code>q = Queue()
  </code></pre>
  
  <p>as an example for instantiation. If i try this, i get the following error:</p>
  
  <pre><code>TypeError: __init__() missing 1 required keyword-only argument: 'ctx'
  </code></pre>
  
  <p>Googling the problem brought up this:</p>
  
  <p><a href="http://bugs.python.org/issue21367" rel="noreferrer">http://bugs.python.org/issue21367</a></p>
  
  <p>How do i know if this is fixed? Is it impossible to use multiprocessing.Queues right now?
  If not, how do i get the needed ctx object (and what is it?)</p>