ostrich.go

package main

import (
	"fmt"
	"sync"
	"time"
	"math/rand"
)

type member struct {
	name string
	isOchi bool
}

func main() {
	var furi sync.WaitGroup
	var boke sync.WaitGroup
	var act sync.WaitGroup
	for _, m := range members() {
		if m.isOchi == false {
			furi.Add(1)
		} else {
			boke.Add(1)
		}
		act.Add(1)
	}

	for _, m := range members() {
		go action(m, furi, boke, act)
	}

	act.Wait()
}

func action(m member, furi sync.WaitGroup, boke sync.WaitGroup, act sync.WaitGroup) {
	defer act.Done()
	if false == m.isOchi {
		time.Sleep(time.Duration(rand.Intn(5000)) * time.Millisecond)
		fmt.Printf("%s: 私がやります！\n", m.name)
		furi.Done()
		boke.Wait()
		fmt.Printf("%s: どうぞどうぞ！\n", m.name)
	} else {
		furi.Wait()
		fmt.Printf("%s: じゃあ、私がやります・・・\n", m.name)
		boke.Done()
	}
}

func members() []member {
	return []member{
		member{"higo", false},
		member{"jimon", false},
		member{"ryuhei", true},
	}
}