[Bug libstdc++/98449] [DR 3343] notify_all_at_thread_exit() should notify on cond while lock is held to avoid a race

[vini.ipsmaker at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98449

Vinícius dos Santos Oliveira <vini.ipsmaker at gmail dot com> changed:

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                 CC|                            |vini.ipsmaker at gmail dot com

--- Comment #2 from Vinícius dos Santos Oliveira <vini.ipsmaker at gmail dot 
com> ---
Created attachment 51126
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51126&action=edit
bugfix

Here's a patch fixing the issue.

If you want a codebase affected by the issue, here's the code for a thread
joining detached threads through a condition variable:
https://gitlab.com/emilua/emilua/-/blob/e5706426305733af02983ecb92a08dd8a00ebf2e/src/main.ypp#L275

Once the condition is met, both resources (mutex + condition variables) are
destroyed just before the application exits. Therefore I cannot use
notify_all_at_thread_exit (there would be a race there).