How to make a worker call itself and verify that the call came from that same worker

Hello!
Sometimes I have to run quite big functions that take longer than 10 ms of CPU time. That's why I was wondering if it's possible for a worker to call itself to "split" the request in a few smaller request (that would fix the CPU time issue right?).

I guess it is possible with service bindings (can I bind a worker to itself?) but is it possible to make sure that the request came from the same worker? I wouldn't want someone to find the URL and be able to call the parts of the functions...
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