#7805: wait until all workers are started before collecting their PIDs
diff --git a/Lib/test/test_multiprocessing.py b/Lib/test/test_multiprocessing.py
index 24366a7..6e585c1 100644
--- a/Lib/test/test_multiprocessing.py
+++ b/Lib/test/test_multiprocessing.py
@@ -1070,8 +1070,16 @@
self.assertEqual(res.get(), sqr(j))
# Refill the pool
p._repopulate_pool()
- # Finally, check that the worker pids have changed
+ # Wait until all workers are alive
+ countdown = 5
+ while countdown and not all(w.is_alive() for w in p._pool):
+ countdown -= 1
+ time.sleep(DELTA)
finalworkerpids = [w.pid for w in p._pool]
+ # All pids should be assigned. See issue #7805.
+ self.assertNotIn(None, origworkerpids)
+ self.assertNotIn(None, finalworkerpids)
+ # Finally, check that the worker pids have changed
self.assertNotEqual(sorted(origworkerpids), sorted(finalworkerpids))
p.close()
p.join()