goでLチカの練習 その２

グリーン、イエロー、レッドの順に点灯。

package main
import(
	"fmt"
	"time"
	"sync"
)
var mutex sync.Mutex
func A() {
	for {
		mutex.Lock()
		time.Sleep(500 * time.Millisecond)
		fmt.Println("green on")
		time.Sleep(500 * time.Millisecond)
		fmt.Println("green off")
		mutex.Unlock()
		time.Sleep(1500 * time.Millisecond)
	}
}
func B() {
	for {
		mutex.Lock()
		time.Sleep(500 * time.Millisecond)
		fmt.Println("yellow on")
		time.Sleep(500 * time.Millisecond)
		fmt.Println("yellow off")
		mutex.Unlock()
		time.Sleep(1500 * time.Millisecond)
	}
}
func C() {
	for {
		mutex.Lock()
		time.Sleep(500 * time.Millisecond)
		fmt.Println("red on")
		time.Sleep(500 * time.Millisecond)
		fmt.Println("red off")
		mutex.Unlock()
		time.Sleep(1500 * time.Millisecond)
	}
}
func main() {
	go A()
	go B()
	go C()
	var input string
	fmt.Scanln(&input)
}