bpo-31069, test_multiprocessing: Fix dangling process (#3103)

Fix a warning about dangling processes in test_rapid_restart() of _test_multiprocessing: join the process.

Author: vstinner

Lib/test/_test_multiprocessing.py

@@ -2596,12 +2596,13 @@ def test_rapid_restart(self):
  manager.start()
 
  p = self.Process(target=self._putter, args=(manager.address, authkey))
- p.daemon = True
  p.start()
+ p.join()
  queue = manager.get_queue()
  self.assertEqual(queue.get(), 'hello world')
  del queue
  manager.shutdown()
+
  manager = QueueManager(
  address=addr, authkey=authkey, serializer=SERIALIZER)
  try: