https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106772

--- Comment #15 from Mkkt Bkkt <valera.mironow at gmail dot com> ---
>  If you have an atomic counter and want to signal when it has been 
> incremented, you cannot tell from the previous value whether another thread 
> is waiting.

I wrote it example.

Do you talk about like semaphore usage?

As I know in libstdc++ semaphore use bare wait without touching waiters_pool.
Am I wrong?

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