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Our embedded code is based on Infineon Aurix Tricore TC29x Microcontroller.

In our main function, core 0 starts core 1. How to find out which C functions are running in which core? Is it possible some C functions are running in both core?
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After Core 0 and Core 1 are started, we start our embedded operating system. I believe this embedded operating systems is based on OSEK/VDX Specification.

This OS decides which tasks will execute in which core? Person writing source code doesn't decide which tasks will execute on which core?
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You can read the CORE_ID register to find out which core you are running in.
The micro starts in core 0. If you choose to enable the other cores, you end up with 3 separate processes.
So you might for example choose to run all your foreground (main loop) on core 0, and point your interrupts at core 1.
What your OS does, I can't say.
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