call site 0 for _thread.WorkerPool.join
thread/testing/test_io.py - line 50
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   def test_threadout_multi_and_default(self):
       num = 3
       defaults = []
       def f(l):
           self.out.setwritefunc(l.append)
           print id(l),
           self.out.delwritefunc()
           print 1
       self.out.setdefaultwriter(defaults.append)
       pool = WorkerPool()
       listlist = []
       for x in range(num):
           l = []
           listlist.append(l)
           pool.dispatch(f, l)
       pool.shutdown()
       for name, value in self.out.__dict__.items():
           print >>sys.stderr, "%s: %s" %(name, value)
->     pool.join(2.0)
       for i in range(num):
           item = listlist[i]
           assert item ==[str(id(item))]
       assert not self.out._tid2out
       assert defaults
       expect = ['1' for x in range(num)]
       defaults = [x for x in defaults if x.strip()]
       assert defaults == expect