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locale.c: Mitigate unsafe threaded locales
This a new set of macros and functions to do locale changing and querying for platforms where perl is compiled with threads, but the platform doesn't have thread-safe locale handling. All it does is: 1) The return of setlocale() is always safely saved in a per-thread buffer, and 2) setlocale() is protected by a mutex from other threads which are using perl's locale functions. This isn't much, but it might be enough to get some programs to work on such platforms which rarely change or query the locale.
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