func runtime_pollWait(ctx uintptr, mode int) int
func runtime_pollWaitCanceled(ctx uintptr, mode int)
func runtime_pollReset(ctx uintptr, mode int) int
func runtime_pollSetDeadline(ctx uintptr, d int64, mode int)
func runtime_pollUnblock(ctx uintptr)
func runtime_isPollServerDescriptor(fd uintptr) bool

type pollDesc struct {
	runtimeCtx uintptr
}

var serverInit sync.Once

func (pd *pollDesc) init(fd *FD) error {

	unlock(&pd.lock)
	if rg != nil {
		netpollgoready(rg, 3)
	}
	if wg != nil {
		netpollgoready(wg, 3)
	}
	netpollAdjustWaiters(delta)
}

//go:linkname poll_runtime_pollUnblock internal/poll.runtime_pollUnblock
func poll_runtime_pollUnblock(pd *pollDesc) {
	lock(&pd.lock)
	if pd.closing {
		throw("runtime: unblock on closing polldesc")
	}
	pd.closing = true
	pd.rseq++
	pd.wseq++
	var rg, wg *g