I'm learning Go

go_file_open_test.go

package main

import (
  "os"
  "log"
)

func open(name string, ch chan []byte, errch chan error) {
  file, err := os.Open(name)
  if err != nil {
    errch <- err
    return
  }

  data := make([]byte, 1000)
  count, err := file.Read(data)
  if err != nil {
    errch <- err
    return
  }

  ch <- data[:count]
}

func main() {
  log.Print("start")
  ch := make(chan []byte)
  errch := make(chan error)
  go open("bar.go", ch, errch)
  go open("barb.go", ch, errch)
  go open("hoge.go", ch, errch)
  for i := 0; i < 3; i++ {
    select {
    case bytes := <-ch:
      log.Println(string(bytes))
      if i == 2 {
        log.Println("finished")
        return
      }
    case err := <-errch:
      log.Fatal(err)
    }
  }
}