Issue #14308: Fix an exception when a "dummy" thread is in the threading module's active list after a fork().
diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
index 1a02ef2..ef04cd3 100644
--- a/Lib/test/test_threading.py
+++ b/Lib/test/test_threading.py
@@ -2,6 +2,8 @@
import test.test_support
from test.test_support import verbose
+from test.script_helper import assert_python_ok
+
import random
import re
import sys
@@ -414,6 +416,33 @@
msg=('%d references still around' %
sys.getrefcount(weak_raising_cyclic_object())))
+ @unittest.skipUnless(hasattr(os, 'fork'), 'test needs fork()')
+ def test_dummy_thread_after_fork(self):
+ # Issue #14308: a dummy thread in the active list doesn't mess up
+ # the after-fork mechanism.
+ code = """if 1:
+ import thread, threading, os, time
+
+ def background_thread(evt):
+ # Creates and registers the _DummyThread instance
+ threading.current_thread()
+ evt.set()
+ time.sleep(10)
+
+ evt = threading.Event()
+ thread.start_new_thread(background_thread, (evt,))
+ evt.wait()
+ assert threading.active_count() == 2, threading.active_count()
+ if os.fork() == 0:
+ assert threading.active_count() == 1, threading.active_count()
+ os._exit(0)
+ else:
+ os.wait()
+ """
+ _, out, err = assert_python_ok("-c", code)
+ self.assertEqual(out, '')
+ self.assertEqual(err, '')
+
class ThreadJoinOnShutdown(BaseTestCase):