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// Go 的_通道选择器_ 让你可以同时等待多个通道操作。
// Go 协程和通道以及选择器的结合是 Go 的一个强大特性。

package main

import "time"
import "fmt"

func main() {

	c1 := make(chan string, 1)

	go func() {
		time.Sleep(time.Second * 2)
		c1 <- "result 1"
	}()

	select {

	case res := <-c1:
		fmt.Println(res)

	case <-time.After(time.Second * 1):
		fmt.Println("timeout 1")

	}

	c2 := make(chan string, 1)
	go func() {
		time.Sleep(time.Second * 2)
		c2 <- "result 2"
	}()

	select {

	case res := <-c2:
		fmt.Println(res)

	case <-time.After(time.Second * 3):
		fmt.Println("timeout 2")
	}
}