1、select实现的超时机制

示例：

 

package mainimport (	"fmt"	"time")func main() {	ch := make(chan int)	quit := make(chan bool)	//新开一个协程	go func() {		for {			select {			case num := <-ch:				fmt.Println("num = ", num)			case <-time.After(3 * time.Second):				fmt.Println("超时")				quit <- true			}		}	}() //别忘了()	for i := 0; i < 5; i++ {		ch <- i		time.Sleep(time.Second)	}	<-quit	fmt.Println("程序结束")}

执行结果：

 

num =  0num =  1num =  2num =  3num =  4超时程序结束