gistfile1.go

func channalselectTest(){
	runtime.GOMAXPROCS(2)
	ch1 := make(chan int)
	ch2 := make(chan int)
	go pump(ch1,2)
	go pump(ch2,5)
	go suck(ch1,ch2)
	time.Sleep(1e9)
}

func pump(ch chan int, step int){
	for i :=0;;i+=step {
		ch <- i
		time.Sleep(5)
	}
}

func suck(ch1, ch2 chan int){
	for {
		select {
		case v:=<-ch1:
			fmt.Printf("%d\n",v)
		case v:=<-ch2:
		_ = v
//			fmt.Printf("receive channel 2: %d\n",v)
		default:
			fmt.Println("non...")
		}
	}
}

/*
期望输出
0
2
4
6
...
中间穿插一些non...

实际上到后面, 两个相邻的数输出虽然还是有序但是差值就都大于2


*/