Hi,
It’s better to not use sync.Cond. Instead, use a channel to do a jame job. 
There is even a issue to discuss remove it.

在2024年7月19日星期五 UTC+8 04:07:26<Robert Engels> 写道:

> But I think that Done() is for the outer which prevents the broadcast. By 
> putting it in the defer all of the subscribers should be waiting on the 
> condition when it occurs. 
>
> Caveat- not looking at code - just remembering. 
>
> On Jul 18, 2024, at 3:01 PM, Lammie Jonson <jrub...@gmail.com> wrote:
>
> 
>
>
> >> defer goroutineRunning.Done()
>
> This doesn't work. Each invocation of subscribe() has it's own 
> sync.WaitGroup. It's just used it appears to ensure that the enclosed 
> goroutine is running before subscribe() returns 
>
>
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