[Bug 296410] sprintf/vfprintf not thread safe on AArch64 due to localeconv_l using atomic_store_int, with relaxed semantics

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=296410

Konstantin Belousov <kib@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kib@FreeBSD.org

--- Comment #1 from Konstantin Belousov <kib@FreeBSD.org> ---
It is easy to change to store_rel in lib/libc/locale/localeconv.c, but is it
enough?

Suppose that we did not observed numeric_locale_changed != 0, but did observed
new values from some loaded fields.  Could this inconsistency cause issues?

If yes, we need something like seqlocks, as used by timecounters and
filedescriptors.

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