// select.gopackage mainimport ( "fmt" "time" //"time")func main() { //声明一个channel ch := make(chan int) //声明一个匿名函数，传入一个参数整型channel类型ch go func(ch chan int) { ch <- 1 //往channel写入一个数据，此时阻塞 }(ch) //由于goroutine执行太快，先让它sleep 1秒 time.Sleep(time.Second) select { //读取ch，解除阻塞 case <-ch: fmt.Print("come to read ch!") default: fmt.Print("come to default!") }}

// select.go//整型channel类型ch一直处于读取状态，所以处于阻塞,使用select实现超时控制package mainimport ( "fmt" "time")func main() { ch := make(chan int) //buffer channel,1个元素前非阻塞 timeout := make(chan int, 1) go func() { time.Sleep(time.Second) //写channel timeout <- 1 }() select { //读channel case <-ch: fmt.Print("come to read ch!") //没有读到channel，实现超时控制 case <-timeout: fmt.Print("come to timeout!") } fmt.Print("end of code!")}

// select.go//使用time.After实现超时控制package mainimport ( "fmt" "time")func main() { ch := make(chan int) select { case <-ch: fmt.Print("come to read ch!") case <-time.After(time.Second): fmt.Print("come to timeout!") } fmt.Print("end of code!")}