private static void RegisterForReadable(TSocket tsocket)
{
bool register = tsocket.SetRegistered();
EPollInterop.EPollControl(tsocket.ThreadContext.EPollFd,
register ? EPollOperation.Add : EPollOperation.Modify,
tsocket.Fd,
EPollEvents.Readable | EPollEvents.OneShot,
EPollData(tsocket.Fd));
}