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Your comment is rude and factually very wrong. The new languages we discuss are definitely not written by "current hipsters", whatever you meant with that.

How does the OS implement concurrency, which is a userspace problem?

Software interrupts alone are not enough, you still need some language support to it. I am not sure you really know what concurrency even means...

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> concurrency, which is a userspace problem

This is another gross misconception, like an attention to manage resources from the userspace, the way JVMs or Node are trying to do by poorly reimplementing OS subsystems.

Concurrency primitives must be implemented by an OS - it will eliminate all the userspace problems - no busy-waiting, no polling, no waking up for every descriptor, etc.

Ignoring an underlying OS instead of having thin wrappers, like Plan9 from userspace does, is exactly what is called ignorance (lack of awareness of a better way).

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