Multithreading go例程中更新后未返回更新值

我遇到了一个问题，返回的整数值与设置的整数值相同，即使在go子例程中更新了整数值。我似乎不知道出了什么问题

//HostUptimeReporter - struct
type HostUptimeReporter struct {
    updateInterval int
    uptime int
    shutdownSignal chan bool

}

//NewHostUpTimeReporter - create reporter instance
func NewHostUpTimeReporter(updateIntervalInSeconds int) HostUptimeReporter {
    instance := HostUptimeReporter{updateInterval: updateIntervalInSeconds, shutdownSignal: make(chan bool), uptime:59}
    ticker := time.NewTicker(time.Duration(updateIntervalInSeconds) * time.Second)
    go func() {
        for {
            select {
            case <-ticker.C:
                instance.uptime += updateIntervalInSeconds          
                fmt.Printf("updated uptime:%v\n", instance.uptime)
            case <-instance.shutdownSignal:
                ticker.Stop()
                return
            }
        }
    }()

    return instance
}

//Shutdown - shuts down the go routine
func (hupr *HostUptimeReporter) Shutdown(){
    hupr.shutdownSignal <- true
}

func main() {

    hurp := NewHostUpTimeReporter(2)
    defer hurp.Shutdown()
    fmt.Printf("current uptime:%v\n", hurp.uptime)
    time.Sleep(3*time.Second)
    fmt.Printf("new uptime:%v\n", hurp.uptime)

}

//HostUptimeReporter-struct
类型HostUptimeReporter结构{
更新区间整数
正常运行时间
关闭信号chan bool
}
//NewHostUpTimeReporter-创建报告器实例
func NewHostUpTimeReporter（updateIntervalinsSeconds int）HostUptimeReporter{
实例：=HostUptimeReporter{updateInterval:updateIntervalInSeconds，ShutdowSignal:make（chan bool），正常运行时间：59}
ticker:=time.NewTicker（time.Duration（updateIntervalInSeconds）*time.Second）
go func（）{
为了{
挑选{
case启动goroutine的函数返回一个HostUptimeReporter

：

func NewHostUpTimeReporter(updateIntervalInSeconds int) HostUptimeReporter {

像这样返回整个结构将返回该结构的副本，因此goroutine和

NewHostUpTimeReporter

调用程序将查看不同的内容。您希望返回指针，以便它们共享数据：

// -----------------------------------------------------v
func NewHostUpTimeReporter(updateIntervalInSeconds int) *HostUptimeReporter {
    instance := &HostUptimeReporter{updateInterval: updateIntervalInSeconds, shutdownSignal: make(chan bool), uptime:59}
    // ---------^
    ...

---

启动goroutine的函数将返回一个

HostUptimeReporter

：

func NewHostUpTimeReporter(updateIntervalInSeconds int) HostUptimeReporter {

像这样返回整个结构将返回该结构的副本，因此goroutine和

NewHostUpTimeReporter

调用程序将查看不同的内容。您希望返回指针，以便它们共享数据：

// -----------------------------------------------------v
func NewHostUpTimeReporter(updateIntervalInSeconds int) *HostUptimeReporter {
    instance := &HostUptimeReporter{updateInterval: updateIntervalInSeconds, shutdownSignal: make(chan bool), uptime:59}
    // ---------^
    ...