Goroutines：ポインタ

sample.go

package main

import (
  "fmt"
  "time"
)

func pcounter( index int, count *int ) {
  for i := 0; i < 5; i++ {
    *count++
    fmt.Println( index, i, *count );
    time.Sleep(100 * time.Millisecond)
  }
}

func counter( index int, count int ) {
  for i := 0; i < 5; i++ {
    count++
    fmt.Println( index, i, count );
    time.Sleep(100 * time.Millisecond)
  }
}

func main() {
  i := 0
  go pcounter( 1, &i )
  go pcounter( 2, &i )
  go counter( 3, i )
  time.Sleep(1000 * time.Millisecond)
  fmt.Println( i )
}