Issue #23799: Added test.test_support.start_threads() for running and
cleaning up multiple threads.
diff --git a/Lib/test/test_threadedtempfile.py b/Lib/test/test_threadedtempfile.py
index 81d9687..c2c30de 100644
--- a/Lib/test/test_threadedtempfile.py
+++ b/Lib/test/test_threadedtempfile.py
@@ -18,7 +18,7 @@
 
 import tempfile
 
-from test.test_support import threading_setup, threading_cleanup, run_unittest, import_module
+from test.test_support import start_threads, run_unittest, import_module
 threading = import_module('threading')
 import unittest
 import StringIO
@@ -46,25 +46,12 @@
 
 class ThreadedTempFileTest(unittest.TestCase):
     def test_main(self):
-        threads = []
-        thread_info = threading_setup()
-
-        for i in range(NUM_THREADS):
-            t = TempFileGreedy()
-            threads.append(t)
-            t.start()
-
-        startEvent.set()
-
-        ok = 0
-        errors = []
-        for t in threads:
-            t.join()
-            ok += t.ok_count
-            if t.error_count:
-                errors.append(str(t.getName()) + str(t.errors.getvalue()))
-
-        threading_cleanup(*thread_info)
+        threads = [TempFileGreedy() for i in range(NUM_THREADS)]
+        with start_threads(threads, startEvent.set):
+            pass
+        ok = sum(t.ok_count for t in threads)
+        errors = [str(t.getName()) + str(t.errors.getvalue())
+                  for t in threads if t.error_count]
 
         msg = "Errors: errors %d ok %d\n%s" % (len(errors), ok,
             '\n'.join(errors))