Hello devs, A (possible) dead loop is found when I use python-daemon and multiprocessing together in PyPy 4.0.1, which does not appear in Python(2.6 or 2.7). Also it does not appear in earlier PyPy versions (2.0.2)
Reproduce:
First install python-daemon:
pypy_pip install python-daemon
Use the following test script (also available in attachment):
#!/usr/bin/pypy
import daemon
import multiprocessing
def test():
q = multiprocessing.Queue(64)
if __name__ == '__main__':
with daemon.DaemonContext():
test()
When executing the script with pypy:
pypy test.py
The background service does not exit, and is consuming 100% CPU:
ps aux | grep pypy
root 7769 99.1 0.5 235332 46812 ? R 17:52 2:09 pypy test.py
root 7775 0.0 0.0 103252 804 pts/1 S+ 17:54 0:00 grep pypy
Executing the script with python:
python2.7 test.py
And the background service normally exits.
Environment:
I'm using CentOS 6.5, with portable PyPy distribution for linux
(https://bitbucket.org/squeaky/portable-pypy/downloads/pypy-4.0.1-linux_x86_64-portable.tar.bz2)
I run the script on system built-in python (python 2.6.6), a compiled CPython
(2.7.11), and pypy from epel-release(pypy 2.0.2, python 2.7.2), and the problem
does not appear. Though the compiled CPython is 2.7.11 and PyPy 4.0.4 is python
2.7.10, I think that does not matter much.
Please contact if you have any questions or ideas.
2015-12-23
hubo
test.py
Description: Binary data
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