I need to make an action when current custiodian shutdowns.

Now I have something like

(define (with-status main-custodian)
   (define a-box (make-custodian-box (current-custodian) #t))
   (parameterize ([current-custodian main-custodian])
       (thread (λ ()
                  (sync a-box)
                  (do-logoff))))

And in main program

(thread (lambda ()
          (define main-custodian (current-custodian))
          (parameterize ([current-custodian (make-custodian])
            ....
            (with-status main-custodian)
            ...)))

Is it the only way or can I somehow make a thread outside of the current 
custodian?

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