runtimeCtx uintptr
}

var serverInit sync.Once

func (pd *pollDesc) init(fd *FD) error {
	serverInit.Do(runtime_pollServerInit)
	ctx, errno := runtime_pollOpen(uintptr(fd.Sysfd))
	if errno != 0 {
		return errnoErr(syscall.Errno(errno))
	}
	pd.runtimeCtx = ctx
	return nil
}

func (pd *pollDesc) close() {
	if pd.runtimeCtx == 0 {
		return
	}
	runtime_pollClose(pd.runtimeCtx)
	pd.runtimeCtx = 0
}