Xiang Zhang added the comment:
I write a simple example which behaviour is like Steven's example.
import os
import sys
import threading
import ctypes
import time
def test():
while True:
print(time.time())
_thread = threading.Thread(target=test)
pid = os.fork()
if pid > 0:
sys.exit(0)
_thread.start()
Run this with py3.4 emits one print and then comes fatal error:
[code]$ python3 ctypes_test.py
1460964519.9721818
[code]$ Fatal Python error: could not acquire lock for <_io.BufferedWriter
name='<stdout>'> at interpreter shutdown, possibly due to daemon threads
Thread 0x00007f41fdadf700 (most recent call first):
File "ctypes_test.py", line 9 in test
File "/usr/lib/python3.4/threading.py", line 868 in run
File "/usr/lib/python3.4/threading.py", line 920 in _bootstrap_inner
File "/usr/lib/python3.4/threading.py", line 888 in _bootstrap
Current thread 0x00007f41ff9a9700 (most recent call first):
^C
Without import ctypes, it's OK.
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<http://bugs.python.org/issue26793>
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