Memory model of the nRF5340: fully compliant with Armv8-m?

[hdiags]

Hello,

We're implementing an application that makes use of C++ std::atomic variables and their associated memory-ordering semantics for inter-processor communication between the application and network cores of the nRF5340.

The Armv8-M Architecture Reference Manual describes the Armv8-M's memory model in chapter B7 and is what we'll be using for reference.

Is the nRF5340 fully compliant to all rules described in chapter B7 of the manual?

Are there any known issues with using C++ atomics (std::atomic) on the nRF5340?

Thanks,

  Colin

[Simon]

Check out https://github.com/zephyrproject-rtos/zephyr/issues/31281

It does not seem like C++ atomics (std::atomic) are supported in NCS/Zephyr at the moment. 

Best regards,

Simon

[hdiags]

Thanks Simon, I hadn't realised that. Do you know regarding the behaviour with respect to the C _Atomic type? (https://en.cppreference.com/w/c/language/atomic)

[hdiags]

Hi Simon, many thanks for your original answer. I wonder whether you know if Zephyr [atomic variables](https://docs.zephyrproject.org/3.0.0/reference/kernel/other/atomic.html) or the Nordic Atomic Operations API work for variables shared across both the network and application cores in the nrf5340?

Many thanks,

  Colin