Golang死锁展示

package main

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

type value struct {
    mu    sync.Mutex
    value int
}

func main() {
    var wg sync.WaitGroup

    printSum := func(v1, v2 *value) {
        defer wg.Done()
        v1.mu.Lock()
        defer v1.mu.Unlock()
        time.Sleep(2 * time.Second)
        v2.mu.Lock()
        defer v2.mu.Unlock()
        fmt.Printf("Sum=%v\n", v1.value+v2.value)
    }

    var a, b value
    wg.Add(2)
    go printSum(&a, &b)
    go printSum(&b, &a)
    wg.Wait()
}

a，b互相等待对方释放锁，形成死锁。
程序输出，

image.png