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go语言for循环中的break
source link: https://segmentfault.com/a/1190000040507680
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go语言for循环中的break
发布于 今天 16:23
今天遇到一个小坑，就是在for包裹的select中使用break，只会跳出select，不会跳出for循环，case如下:
func main() {
cxt,cancel := context.WithCancel(context.Background())
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
for {
select {
case <-cxt.Done():
time.Sleep(time.Second)
fmt.Println("it cancel")
break
//只会跳出select 不会跳出for循环
//在这里可以直接return
//或者配合label标签推出循环
default:
fmt.Println("Go go go")
time.Sleep(time.Second)
}
}
}()
time.Sleep(1500*time.Millisecond)
cancel()
wg.Wait()
}
Go go go Go go go it cancel it cancel it cancel it cancel it cancel ··· //死循环
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