Issue #9670: Increase the default stack size for secondary threads on
Mac OS X and FreeBSD to reduce the chances of a crash instead of a
"maximum recursion depth" RuntimeError exception.
(Patch by Ronald Oussoren)
diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
index f977a7f..75235ad 100644
--- a/Lib/test/test_threading.py
+++ b/Lib/test/test_threading.py
@@ -650,6 +650,36 @@
thread.start()
self.assertRaises(RuntimeError, setattr, thread, "daemon", True)
+ def test_recursion_limit(self):
+ # Issue 9670
+ # test that excessive recursion within a non-main thread causes
+ # an exception rather than crashing the interpreter on platforms
+ # like Mac OS X or FreeBSD which have small default stack sizes
+ # for threads
+ script = """if True:
+ import threading
+
+ def recurse():
+ return recurse()
+
+ def outer():
+ try:
+ recurse()
+ except RuntimeError:
+ pass
+
+ w = threading.Thread(target=outer)
+ w.start()
+ w.join()
+ print('end of main thread')
+ """
+ expected_output = "end of main thread\n"
+ p = subprocess.Popen([sys.executable, "-c", script],
+ stdout=subprocess.PIPE)
+ stdout, stderr = p.communicate()
+ data = stdout.decode().replace('\r', '')
+ self.assertEqual(p.returncode, 0, "Unexpected error")
+ self.assertEqual(data, expected_output)
class LockTests(lock_tests.LockTests):
locktype = staticmethod(threading.Lock)