Every operating system kernel also presents a synchronous interface to asynchronous I/O. What Go provides is more efficient multithreading in certain cases, pri

Every operating system kernel also presents a synchronous interface to asynchronous I/O. What Go provides is more efficient multithreading in certain cases, primarily because the kernel scheduler doesn't need to be involved on context switches. But this could be fixed at the kernel level with something like Windows' fibers or Google's SwitchTo patches.