[Bug libstdc++/104101] [12 Regression] libstdc++ shared_ptr_atomic fails on AIX

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104101

--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>:

https://gcc.gnu.org/g:c3861f79859d96777f86a24261fe639538fd2e1c

commit r12-6708-gc3861f79859d96777f86a24261fe639538fd2e1c
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Tue Jan 18 21:15:05 2022 +0000

    libstdc++: Fix std::atomic<std::shared_ptr<T>> for AIX [PR104101]

    This fixes an on AIX.

    The lock function currently just spins, which should be changed to use
    back-off, and maybe then _M_val.wait(__current) when supported.

    libstdc++-v3/ChangeLog:

            PR libstdc++/104101
            * include/bits/shared_ptr_atomic.h
(_Sp_atomic::_Atomic_count::lock):
            Only use __thread_relax if __cpp_lib_atomic_wait is defined.