golang死锁

package main

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

var (
	x,y int
	wg sync.WaitGroup
	lockX sync.Mutex   //用来锁变量x
	lockY sync.Mutex   //用来锁变量y
)

func LockA()  {
	defer wg.Done()
	lockX.Lock()    //将x锁住
	x++
	time.Sleep(time.Second)  //给函数LockB时间，用来锁住y
	lockY.Lock()   //将y锁住
	y++
	lockY.Unlock()
	lockX.Unlock()
}

func LockB()  {
	defer wg.Done()
	lockY.Lock()  //将y锁住
	y++
	time.Sleep(time.Second)   //给函数LockA时间，用来锁住x
	lockX.Lock()  //将x锁住
	x++
	lockX.Unlock()
	lockY.Unlock()
}

func main() {
	wg.Add(2)
	go LockA()
	go LockB()
	wg.Wait()

	fmt.Println("x = ", x)
	fmt.Println("y = ", y)
}

运行结果：

fatal error: all goroutines are asleep - deadlock!

goroutine 1 [semacquire]:
sync.runtime_Semacquire(0x0)