Python crash with multiple JVM threads

[forman]

The Python interpreter crashes when we call from multiple JVM threads at the same time. See

• PyObjectTest.testCreateProxyAndCallSingleThreaded() --> ok
• PyObjectTest.testCreateProxyAndCallMultiThreaded() --> crash

It is for sure a GIL-related bug. Look here for very similar problems:

• http://stackoverflow.com/questions/15470367/pyeval-initthreads-in-python-3-how-when-to-call-it-the-saga-continues-ad-naus
• http://stackoverflow.com/questions/10625584/embedding-python-in-multithreaded-c-application
• http://stackoverflow.com/questions/4866701/python-pygilstate-ensure-release-causes-segfault-while-returning-to-c-from-p

[bcdev]

Background information and how-tos:

• Embedding Python in Multi-Threaded C/C++ Applications - http://www.linuxjournal.com/article/3641
• Python Doc: Thread State and the Global Interpreter Lock - http://docs.python.org/3/c-api/init.html
• http://www.codevate.com/blog/7-concurrency-with-embedded-python-in-a-multi-threaded-c-application
• https://wiki.python.org/moin/GlobalInterpreterLock
• http://www.dabeaz.com/python/UnderstandingGIL.pdf

[forman]

I've posted the solution as an answer to http://stackoverflow.com/questions/10625584/embedding-python-in-multithreaded-c-application