3threadlock.go

package main

import (
	"fmt"
	"sync"
	"time"
)

func main() {
	c := make(chan string, 3)
	var mux1, mux2, mux3 sync.Mutex

	mux1.Lock()
	go func() {
		time.Sleep(2 * time.Second)
		c <- "first thread"
		mux1.Unlock()
	}()

	mux2.Lock()
	go func() {
		time.Sleep(3 * time.Second)
		c <- "second thread"
		mux2.Unlock()
	}()

	mux3.Lock()
	go func() {
		time.Sleep(1 * time.Second)
		c <- "third thread"
		mux3.Unlock()

	}()

	mux1.Lock()
	fmt.Println("unlocked 1")
	mux2.Lock()
	fmt.Println("unlocked 2")
	mux3.Lock()
	fmt.Println("unlocked 3")
	fmt.Println(<-c)
	fmt.Println(<-c)
	fmt.Println(<-c)
	mux1.Unlock()
	mux2.Unlock()
	mux3.Unlock()

}