package main

import "fmt"

func main() {

	messages := make(chan string)

	signals := make(chan bool)

	select {

	case msg := <-messages:

		fmt.Println("received message", msg)

	default:

		fmt.Println("no message received")

	}

	msg := "hi"

	select {

	case messages <- msg:

		fmt.Println("sent message", msg)

	default:

		fmt.Println("no message sent")

	}

	select {

	case msg := <-messages:

		fmt.Println("received message", msg)

	case sig := <-signals:

		fmt.Println("received signal", sig)

	default:

		fmt.Println("no activity")

	}

}