[Bug libstdc++/103187] std::counting_semaphore::try_acquire_for does not unblock during wait duration

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103187

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The relevant commit seems to be g:aeaea265cea3a2b2e772af7825351a4ceef29aac but
that *should* only be an optimization to use futexes when available. The fact
it times out without that change suggests the non-futex code has a bug, and
it's probably still there on trunk.