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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 2012-04-19 23:55:01 +02:00
parent c45868ec69
commit 52849bfaa3
3 changed files with 36 additions and 0 deletions
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29
Lib/test/test_threading.py
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@ -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 @@ class ThreadTests(BaseTestCase):
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):