why use of real time operating systems(RTOS) helps code reuse?

I read somewhere that use of RTOS helps code resue?   How ?
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phoffricConnect With a Mentor Commented:
In some embedded processors, there are no OS, so you have to write your own I/O, interrupt handlers, timers, multi-threading, etc. But with an RTOS, if available for the CPU and chipset, you do not have to reinvent the wheel. Perhaps that is what is meant by "RTOS helps code re-use".
ste5anSenior DeveloperCommented:
The kind of OS has nothing to do with code reuse.

Maybe you should give us the source of this quote.
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