I need to update common storage from my IEFU85 SMF exit. I am currently using a 
compare and swap loop to serialize on this update but I think there is a 
problem with this approach and looking at using SETLOCK. My question is... 

IEFU85 is in cross memory mode. I need the CMS lock. To get the CMS lock you 
must have the CML or LOCAL lock first. Since IEFU85 is in cross memory mode 
must I get the CML lock or can I get the LOCAL lock?

Part 2: If I must get the CML lock which address space should I place in R11?

Note: I never used locking before so if I have stated anything incorrectly, 
please correct me. I also have not delted with cross memory before.

Part 3: To issue the SETLOCK command, do I have to worry about AR mode before 
issuing in an SMF exit?

Thanks  

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