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Issue #14308: Fix an exception when a dummy thread is in the threading module's active list after a fork().

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This commit is contained in:
Antoine Pitrou 2012-04-20 00:05:17 +02:00
commit dd5aa36f17
3 changed files with 35 additions and 0 deletions
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29
Lib/test/test_threading.py
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@ -2,6 +2,8 @@
import test.support
from test.support import verbose, strip_python_stderr, import_module
from test.script_helper import assert_python_ok
import random
import re
import sys
@ -415,6 +417,33 @@ class ThreadTests(BaseTestCase):
t = threading.Thread(daemon=True)
self.assertTrue(t.daemon)
@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, b'')
self.assertEqual(err, b'')
class ThreadJoinOnShutdown(BaseTestCase):