Go - WaitGroup

package main

import (
	"fmt"
	"sync"
)

//WaitGroup用于等待一组线程的结束。父线程调用Add方法来设定应等待的线程的数量。每个被等待的线程在结束时应调用Done方法。同时，主线程里可以调用Wait方法阻塞至所有线程结束

func main() {
	var wg sync.WaitGroup
	wg.Add(2)
	c := make(chan int)
	go send(c, &wg)
	go receive(c, &wg)
	wg.Wait()
}

func receive(c chan int, wg *sync.WaitGroup) {
	for i := range c {
		fmt.Println(i)
	}
	wg.Done()
}

func send(c chan int, wg *sync.WaitGroup) {
	for i := 0; i < 10; i++ {
		c <- i
	}

	close(c)
	wg.Done()
}