Support atomic load and store

[LnnrtS]

This works out of the box

std::atomic<uint32_t> tmp;
tmp = 123;

this doesn't

std::atomic<uint64_t> tmp;
tmp = 123;

because of this

in function `std::__atomic_base<unsigned long long>::store(unsigned long long, std::memory_order)':
undefined reference to `__atomic_store_8'

[ilg-ul]

I don't remember anything about using atomic operations in µOS++.

Where do the atomic definitions come from?

[LnnrtS]

I don't know but I could imagine it knows that the architecture supports atomic operations under some circumstances (everything smaller than words) without further measures.

[ilg-ul]

Then probably it comes from the compiler definitions.

How do you suggest to fix it?

[LnnrtS]

How do you suggest to fix it?

I haven't though much about it but I would guess the actual access has to happen inside some critical section.

[ilg-ul]

inside some critical section

AFAIK, atomics are implemented with some special instructions, not explicit critical sections.