This is basically "There is no Thread": https://blog.stephencleary.com/2013/11/there-is-no-thread.html https://blog.stephencleary.com/2013/11/there-is-no-threa

This is basically "There is no Thread": https://blog.stephencleary.com/2013/11/there-is-no-thread.html https://blog.stephencleary.com/2013/11/there-is-no-thread.ht... There are times when you can offload an asynchronous task to non-CPU hardware, in which case the blocking thread can disappear. The thread reappears when the hardware asynchronously informs the CPU of task completion. (This idea is what Node.JS is entirely reliant upon.) Consider if we didn't have timing hardware to handle this task for us. We could implement a timer with a spin-loop thread which checks the clock and fires off events.