call site 5 for _thread.WorkerPool.dispatch
thread/testing/test_pool.py - line 72
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   def test_join_timeout():
       pool = WorkerPool()
       q = py.std.Queue.Queue()
       def f():
           q.get() 
->     reply = pool.dispatch(f)
       pool.shutdown()
       py.test.raises(IOError, pool.join, 0.01)
       q.put(None)
       reply.get(timeout=1.0) 
       pool.join(timeout=0.1)