Acess variable that was set by thread

[ag0aep6g]

On Monday, 8 August 2022 at 13:31:04 UTC, Steven Schveighoffer 
wrote:
> On 8/8/22 6:17 AM, ag0aep6g wrote:
[...]
>> Never ever use `__gshared` ever. It's a glaring safety hole. 
>> Use `shared` instead.
>
> If you are interfacing with C, you need __gshared. But yeah, 
> you should use shared in this case.

A quick test suggests that `extern(C) extern shared` works fine.

As far as I can tell, `__gshared` is only ever ok-ish when you 
want to access a shared C variable in a single-threaded program. 
And then you're still setting yourself up for failure if you 
later add more threads.

So, never ever use `__gshared` (in multi-threaded code) ever.