Is thread a windows concept?

Question

So i was reading "CLR via C#" and found this line "A thread is a Windows concept whose job is to virtualize the CPU". Really? Was single\multi thread originally from Windows?

Googling for justification did not help and hence seeking help from the community.

Answer 1

I suppose what the author really meant is that threading as a mechanism is something that is being managed by Windows and not .NET framework.

Answer 2

Short answer: No, it's not solely a Windows concept, and the concept has been around for quite a long time.