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[0:02] <jimbaker> cleanup_hang, definitely possible. ThreadState has the potential to leak like this. to be fixed in the next version of jython - unfortunately we couldn't do it for 2.5.x, since backwards breaking api change
[0:05] <jimbaker> or for that matter PySystemState, as you implicate (shadow() is my hack to avoid backwards-breaking api changes). also to be fixed.
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[0:23] <jimbaker> in fact, as i just looked at shadow support, this seems like something that should be done sooner than later
[0:24] <jimbaker> that is, a trivial branch
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[7:32] -christel- [Global Notice] Hi all, it would appear that we are the target of a dos attack this morning -- far from what you fancy before you've had your coffee! I apologise for the inconvenience, and we'll be working closely with our sponsors to try drop this traffic at the door.
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[19:43] <cleanup_hang> if a jython script imports threading (from Lib/threading.py) then a _MainThread() is created (line 273)
[19:44] <cleanup_hang> when _MainThread() is created, it registers the thread with _threading (from org/python/modules/_threading/_threading.java)
[19:44] <cleanup_hang> The registration map is *NOT* a java.lang.ThreadLocal construct
[19:45] <cleanup_hang> when an interpreter cleans up, it waits for all registered threads to die
[19:46] <cleanup_hang> so if two interpreters are concurrently created, and both import threading, then both threads will thusly be registered in the static _threading._threads map.
[19:47] <cleanup_hang> at that point, with both threads in the map, when the first one tries to cleanup and calls into _MainThread.__exitfunc() it will wait (JavaThread.join()) for the the second to complete.
[19:48] <cleanup_hang> ie, it will be waiting indefinitely for an unrelated thread.
[19:49] <cleanup_hang> One solution is to add a timeout to the join() call in _MainThread.__exitfunc()
[19:49] <cleanup_hang> A second solution is to make the guts of org/python/modules/_threading/_threading have some flavor of thread-locality (eg, java.lang.ThreadLocal)
[19:50] <cleanup_hang> fyi
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[19:52] <pjenvey_> if the PythonInterpreters have separate PySystemStates (sys module, and thus a different accompanying sys.modules) should in theory avoid this too
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[19:56] <cleanup_hang> I'm running 2.5.2, and each interpreter is created with it's own shadowed PySystemState and ThreadState.
[19:57] <cleanup_hang> we ran into some 'shared PySystemState' issues before, and ensuring we have separate PySystemStates, each with shadow() call on them, fixed those issues.
[19:58] <cleanup_hang> This issue is specific to a "import threading" (or the like) call, which implicitly creates a new _MainThread() and registers it.
[20:00] <cleanup_hang> in other words, concurrently executing on N separate interpreters is working just fine *IFF* *ONE* of those interpreters ever actually imports threading. If > 1 concurrently executing interpreters import threading, then some of the interpreters will hang on a .cleanup() call.
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[21:01] <jimbaker> cleanup_hang, maybe monkeypatch threading._register_thread and _unregister_thread (and referring functions) to not do this registration
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[21:01] <jimbaker> this might be a workaround for you
[21:01] <jimbaker> we will definitely want to audit any static fields like this for 2.6
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