循环打印ABCgolang

package main

import (
	"sync"
)
var count = 5

func main()  {
	wg := sync.WaitGroup{}
	chanA := make(chan struct{},1)
	chanB := make(chan struct{},2)
	chanC := make(chan struct{},3)
	chanA <- struct{}{}
	wg.Add(3)
	go printA(&wg,chanA,chanB)
	go printB(&wg,chanB,chanC)
	go printC(&wg,chanC,chanA)
	wg.Wait()

}

func printA(wg *sync.WaitGroup, chanA chan struct{}, chanB chan struct{})  {
	defer wg.Done()
	for i:=0;i< count;i++{
		<- chanA
		println("A")
		chanB <- struct{}{}
	}
}
func printB(wg *sync.WaitGroup, chanB chan struct{}, chanC chan struct{})  {
	defer wg.Done()
	for i:=0;i< count;i++{
		<- chanB
		println("B")
		chanC <- struct{}{}
	}
}
func printC(wg *sync.WaitGroup, chanC chan struct{}, chanA chan struct{})  {
	defer wg.Done()
	for i:=0;i< count;i++{
		<- chanC
		println("C")
		chanA <- struct{}{}
	}
}