client.go

package main

import "net/rpc"

type Region struct {
  X, Y int
}

func main() {
  client, _ := rpc.Dial("tcp", ":8080")

  region := Region{0,0}

  div_call := client.Go("MyRegionServer.GetRegion", 1, &region, nil)
  <-div_call.Done

  println(region.X, region.Y)
}

server.go

package main

import "net"
import "net/rpc"

type Region struct {
  X, Y int
}

type MyRegionServer int

func (s *MyRegionServer) GetRegion(id *int, reply *Region) error {
  println("Someone want's a region with id", *id)

  found_region := Region{10,20}
  reply = &found_region

  println("Let's give him a region", reply.X, reply.Y)

  return nil
}

func main() {
  listener, _ := net.Listen("tcp", ":8080")

  rpc_server := rpc.NewServer()
  rpc_server.Register( new(MyRegionServer) )

  for {
    rpc_server.Accept(listener)
  }
}