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bpo-36402: Add test_threading.test_finalization_shutdown() #13949

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bpo-36402: Add test_threading.test_finalization_shutdown() #13949

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35 changes: 35 additions & 0 deletions Lib/test/test_threading.py
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Original file line number Diff line number Diff line change
Expand Up @@ -583,6 +583,41 @@ def __del__(self):
self.assertEqual(data.splitlines(),
["GC: True True True"] * 2)

def test_finalization_shutdown(self):
# bpo-36402: Py_Finalize() calls threading._shutdown() which must wait
# until Python thread states of all threads get deleted.
#
# Test similar to SubinterpThreadingTests.test_threads_join_2(), but
# finalization of the main interpreter.
code = """if 1:
import os
import threading
import time
import random

def random_sleep():
seconds = random.random() * 0.010
time.sleep(seconds)

class Sleeper:
def __del__(self):
random_sleep()

tls = threading.local()

def f():
# Sleep a bit so that the thread is still running when
# Py_EndInterpreter is called.
random_sleep()
tls.x = Sleeper()
random_sleep()

threading.Thread(target=f).start()
random_sleep()
"""
rc, out, err = assert_python_ok("-c", code)
self.assertEqual(err, b"")

def test_tstate_lock(self):
# Test an implementation detail of Thread objects.
started = _thread.allocate_lock()
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