Add integration tests for single-core machines

[jsuereth]

Is your feature request related to a problem?
It's possible that the C++ API is used on single-core machines. If we don't test our code on single core, it's possible we use threading primitives that require multi-core to make progress, e.g spin-locks.

Describe the solution you'd like
We should at a minimum KNOW if we support single-core machines via running integration tests against them. It could be we explicitly decide not to support single-core usage, but we should at least know the status.

Describe alternatives you've considered
Have not considered alternatives.

Additional context
N/A

[maxgolov]

@jsuereth - is this something we can run on GitHub Action - Linux image, with --cpus=1 option? This may cover Linux, but not Windows nor Mac.

[jsuereth]

I think just using --cpus=1 on Linux is probably fine for now. I"ll add that in a PR after the updated spin-lock (#415) goes through

[github-actions]

This issue was marked as stale due to lack of activity. It will be closed in 7 days if no furthur activity occurs.

[github-actions]

This issue was marked as stale due to lack of activity. It will be closed in 7 days if no furthur activity occurs.

[github-actions]

This issue was marked as stale due to lack of activity. It will be closed in 7 days if no furthur activity occurs.