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AM2634: Multicore data exchange - SDK example project question

Part Number: AM2634

Hi TI Expert,

I am referring to 'IPC Spinlock Sharedmem' example project from SDK. I see "gUserSharedMem" variable is defined in both r5fss0-0 and r5fss0-1 projects.

could you please let me know if it is compulsory to define a variable that I want to use in multiple cores on all the cores?

Or can I simply define it and extern it in one main core and then include the header file in other cores path to access that variable?

Thanks!