There are Linux system calls in wide use that are blocking. Both node.js and Golang use native threads to make the system calls and "park and wait" for the resp

There are Linux system calls in wide use that are blocking. Both node.js and Golang use native threads to make the system calls and "park and wait" for the response. The runtimes then take the information from the call and incorporate it back into the user code threads(the one user thread in node.js).