WaitForMultipleObjects is problematic for a few reasons: * limited to 64 handles. * passes the entire handle buffer to the kernel on every call. That is also

WaitForMultipleObjects is problematic for a few reasons: * limited to 64 handles. * passes the entire handle buffer to the kernel on every call. That is also a key reason poll is worse than epoll/kqueue. A better way is to let the kernel retain the list of handles across calls. * when two handles are signalled, the one earlier in the array is always the one returned. So handle with a lower array index being frequently signalled can starve out your opportunity to process the later ones. * since everything happens by returning an index, when multiple handles are signalled, you can only process one at a time, needing a new syscall for each.