How to divide tasks to be done by Nios II processor & Logic elements?

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Everything, that needs computing power, goes to the part with logic elements and VHDL, simple tasks like rs232 communication go to C code on Nios II.

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Thanks for your reply, linas... Correct me if I am wrong as I am really a beginner here, I thought I want the C code to do the tedious tasks instead of simple tasks cause VHDL tends to become very long for complicated task due to its low level language

sorting algorithm -

if-else comparison -

switching on and off -

Can I assign the switching signals array in C language, then send one by one bit to the switching circuits represented in logic elements (VHDL)?

I think I still don't quite get the idea, sorry, do you mind to give me links/resources in order to learn how to determine/divide the workloads for Nios II processor (C language) and logic elements (VHDL)?

Appreciate your time