go 中channel的一个用法

package main

import (
	"fmt"
	"time"
)

type SomeStr struct {
	val     int
	process chan struct{}
}

func SendTask(taskCh chan SomeStr) {
	done := make(chan struct{})
	taskCh <- SomeStr{val: 100, process: done}
	fmt.Println("waitting done")
	<-done
	fmt.Println("task is over")
}

func main() {
	taskCh := make(chan SomeStr)
	go SendTask(taskCh)

	for {
		select {
		case v := <-taskCh:
			fmt.Println("recv val:", v.val)
			close(v.process)
			time.Sleep(time.Second)
			return
		}
	}
}