There is no equivalent to epoll on Windows. There is select (that just happens to get slower when socket's numerical id gets larger). There is also IOCP, which is an ass-backward epoll - a typical Microsoftish contraption that was supposed to be better by being more universal, but ended up being a retarded piece of disaster compared to epoll. I killed a couple of months trying to push and shape IOCP back into the BSD style API, and in the end it worked, but the guts were ugly and the process was utterly unpleasant.

So, no, the "subsystem for unix-based applications" is a no go.