go func() {
        for {
            total++
            e, b := sentinel.Entry("abc")
            if b != nil {
                // goroutine1 阻塞
                totalBlock++
                fmt.Println("协程熔断了")
                time.Sleep(time.Duration(rand.Uint64()%20) * time.Millisecond)
            } else {
                totalPass++
                if rand.Uint64()%20 > 9 {
                    totalErr++
                    // 将当前调用记录为错误。
                    sentinel.TraceError(e, errors.New("biz error"))
                }
                // goroutine1 通过
                time.Sleep(time.Duration(rand.Uint64()%50+10) * time.Millisecond)
                e.Exit()
            }
        }
    }()
    go func() {
        for {
            total++
            e, b := sentinel.Entry("abc")
            if b != nil {
                // goroutine2 阻塞
                totalBlock++
                time.Sleep(time.Duration(rand.Uint64()%20) * time.Millisecond)
            } else {
                // goroutine2 通过
                totalPass++
                time.Sleep(time.Duration(rand.Uint64()%80) * time.Millisecond)
                e.Exit()
            }
        }
    }()

这两个协程都是直接操作total，totalBlock，totalPass。在不加锁的情况下，会出现重写等线程安全问题吧