チャネル&&ゴルーチンのケース演習

package main

import(
	"fmt"
)
func writeNum(numChan chan int){
	for i := 1; i <= 2000; i++ {
		numChan<- i
	}
	close(numChan)
}

func readNum(numChan chan int,resChan chan int,exitChan chan bool) {
	res := 0
	for{
		//n,ok := <-numChan
		n := <-numChan
		if len(numChan) == 0{
			break
		}
		fmt.Printf("读取到的数据=%v\n", n)
		for i := 1; i <= n; i++ {
			res += i	
		}
		resChan<- res
	}
	fmt.Println("协程工作完成！！！")
	exitChan<- true
}
func main() {
	resChan := make(chan int,2000)
	numChan := make(chan int,2000)
	exitChan := make(chan bool,8)
	go writeNum(numChan)
	for i := 1; i <= 8; i++ {
		go readNum(numChan,resChan,exitChan)
	}
	for{
		if len(exitChan) == 8{
			fmt.Println("主线程即将结束")
			close(exitChan)
			close(resChan)
			break
		}
	}
	
	i := 1
	for v := range resChan {
		fmt.Printf("res[%v] = %v\n",i,v)
		i++
	}
}