Hello Rubyists,
As part of issue #11700, I am trying to get all failing tests to run & pass 
on JRuby. I have solved some issues & got almost all tests green. but there 
is this async stream test[1] which I have trouble debugging. to run this, 
just copy-paste following commands[2], assuming you are using rvm. 

This test hangs on ActionController::Live:Response. My guess, its due the 
fact MRI has GIL/GVL & JRuby is truly multi-threaded. so looking for for 
some assistance on debugging this issue or general advice on how to approach 
threading 
issues.  so we could get this code to work correctly on JRuby. Thanks

Regards,
Gaurish Sharma
PS: Its possible that if you run this test, it just passes fine. in which 
case, run is multiple times until you get a failure. This random behaviour 
is what makes debugging threading issues hard.





[1] 
https://github.com/rails/rails/blob/master/actionpack/test/controller/live_stream_test.rb#L208-L227
[2] https://gist.github.com/gaurish/7386298

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