[gnutls-devel] GnuTLS | WIP: fixed operation under multiple threads (!935)

[Development of GNU's TLS library]

I agree that an atomic variable would not fix the issue properly, but having a temporary variable sounds like it might trigger some Time-Of-Check-Time-To-Use types bugs, which might be harder to debug.
I don't think there's a way around having a mutex here is you need to check a flag and do some processing depending on the value of that flag, especially if that means updating some states afterward.

That being said, maybe this commit is fine for the time being, as it indeed fixes the observable issue. Another follow up issue could be spawned of out it

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