golang select

监听多个文件描述符状态
1.随机性，多个case同时满足，随机返回一个
2.没有default会阻塞

package main

import (
	"fmt"
)

func main() {

	ch1 := make(chan int, 1)
	ch2 := make(chan int, 1)

	ch1 <- 1
	ch2 <- 2

	select {
	case val := <-ch1:
		fmt.Printf("read ch1: %d\n", val)
	case val := <-ch2:
		fmt.Printf("read ch2: %d\n", val)
	}
}