有人遇到过 Golang select case 语句和 default 语句都没执行的情况吗？

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程序大致逻辑如下，会正常运行一段时间，receiving msg和sleeping会交替打印，但运行一段时间后最后输出一段pipeline sleeping之后就再也没有日志了，没有pipeline terminate，没有 panic，也没有到 defer 那一步

var sigChan = make(chan os.Signal, 1) func init() { signal.Notify( sigChan, os.Kill, os.Interrupt, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT, ) } func (ip *InnerPipeline) Run() { defer func() { log.Infof("pipeline<%s> defer exit", ip.name) }() for { select { case im := <-ip.messageQueue: log.Debugf("receiving msg %+v", im) // some logic .... xxxxxxxxxxxxxxx log.Debugf("quit case") case <-sigChan: log.Infof("pipeline terminate") return default: log.Debugf("current chan len: %d", len(ip.messageQueue)) // some logic .... xxxxxxxxxxxxxxx log.Debugf("pipeline<%s> sleeping...", ip.name) time.Sleep(50 * time.Millisecond) } } }

Supplement 1 Aug 10, 2021

忘了描述了，主程序没有结束，msg produce 的地方依然在打印日志

```golang
func main() {
pipeline := NewInnerPipeline("name", 1000)

// some msg produce logic
xxxxxxxxx

go pipeline.Run()

// other logic
xxxxxxx
}

```

13 replies 2021-08-10 18:53:48 +08:00