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//使用通道同步goroutine
func printNumbers(w chan bool) {
	for i := 0; i < 10; i++ {
		time.Sleep(1 * time.Microsecond)
		fmt.Printf("%d ", i)
	}
	w <- true
}

func printLetters(w chan bool) {
	for i := 'A'; i < 'A'+10; i++ {
		time.Sleep(1 * time.Microsecond)
		fmt.Printf("%c ", i)
	}
	w <- true
}

func main() {
	w1, w2 := make(chan bool), make(chan bool)
	go printNumbers(w1)
	go printLetters(w2)
	<-w1
	<-w2
}

//使用通道实现消息传递
func thrower(c chan int) {
	for i := 0; i < 5; i++ {
		c <- i
		fmt.Println("Threw  >>", i)
	}
}

func catcher(c chan int) {
	for i := 0; i < 5; i++ {
		num := <-c
		fmt.Println("Caught <<", num)
	}
}

func main() {
	c := make(chan int, 3)
	go thrower(c)
	go catcher(c)
	time.Sleep(100 * time.Millisecond)
}

//用关闭通道的方式避免死锁
func callerA(c chan string) {
	c <- "Hello World!"
	close(c)
}

func callerB(c chan string) {
	c <- "Hola Mundo!"
	close(c)
}

func main() {
	a, b := make(chan string), make(chan string)
	go callerA(a)
	go callerB(b)
	var msg string
	openA, openB := true, true
	for openA || openB {
		select {
		case msg, openA = <-a:
			if openA {
				fmt.Printf("%s from A\n", msg)
			}			
		case msg, openB = <-b:
			if openB {
				fmt.Printf("%s from B\n", msg)
			}			
		}
	}
}