我遇到了一个问题,即使在go子例程中更新了该值之后,返回的整数值也与一个集合相同。我好像搞不清出了什么问题。
//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)
}https://play.golang.org/p/ODjSBb0YugK
任何指点都会受到赞赏。
谢谢!
发布于 2018-09-30 04:03:50
启动goroutine的函数返回一个HostUptimeReporter。
func NewHostUpTimeReporter(updateIntervalInSeconds int) HostUptimeReporter {返回一个像这样的完整结构,返回一个结构的副本,因此goroutine和NewHostUpTimeReporter调用者正在查看不同的内容。您希望返回一个指针,以便它们共享数据:
// -----------------------------------------------------v
func NewHostUpTimeReporter(updateIntervalInSeconds int) *HostUptimeReporter {
    instance := &HostUptimeReporter{updateInterval: updateIntervalInSeconds, shutdownSignal: make(chan bool), uptime:59}
    // ---------^
    ...https://stackoverflow.com/questions/52574401
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