assess what subroutines are currently being called

I have a top level widget event timer that calls a sub routine 
periodically and does some checks. 

I'd like to add some code, for specific reasons, to be able to assess 
what other subroutines are currently being executed with the mainloop.  
Is this possible?  I'd expect the call to always indicate the event sub 
to be running so any additional subs is what I am interested in.

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