Created attachment 882722 [details] reproducer Description of problem: pthreading.monkey_patch() changes threading.Lock only after threading._MainThread has been initialized with the predefined Lock. For some reason, when it's time to __stop() the main thread, _MainThread.__block.notify_all() fails. I'm not aware of any side effects of this, but it's ugly and sounds dangerous. Version-Release number of selected component (if applicable): pthreading-0.1.3 How reproducible: 100% Steps to Reproduce: 1. pthreading.monkey_patch() 2. call os.fork from a thread (see attached reproducer) Actual results: Traceback (most recent call last): File "fork_exception.py", line 11, in after_fork orig_after_fork() File "/usr/lib64/python2.7/threading.py", line 1239, in _after_fork thread._Thread__stop() File "/usr/lib64/python2.7/threading.py", line 874, in __stop self.__block.notify_all() File "/usr/lib64/python2.7/threading.py", line 409, in notifyAll self.notify(len(self.__waiters)) File "/usr/lib64/python2.7/threading.py", line 386, in notify raise RuntimeError("cannot notify on un-acquired lock") RuntimeError: cannot notify on un-acquired lock Exception RuntimeError: RuntimeError('cannot notify on un-acquired lock',) in <module 'threading' from '/usr/lib64/python2.7/threading.pyc'> ignored Expected results: silence
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