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DUPLOCALE(3) FreeBSD Library Functions Manual DUPLOCALE(3) NAME duplocale - duplicate an locale LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <locale.h> locale_t duplocale(locale_t locale); DESCRIPTION Duplicates an existing locale_t returning a new locale_t that refers to the same locale values but has an independent internal state. Various functions, such as mblen(3) require a persistent state. These functions formerly used static variables and calls to them from multiple threads had undefined behavior. They now use fields in the locale_t associated with the current thread by uselocale(3). These calls are therefore only thread safe on threads with a unique per-thread locale. The locale returned by this call must be freed with freelocale(3). SEE ALSO freelocale(3), localeconv(3), newlocale(3), querylocale(3), uselocale(3), xlocale(3) STANDARDS This function conforms to IEEE Std 1003.1-2008 ("POSIX.1"). BUGS Ideally, uselocale(3) should make a copy of the locale_t implicitly to ensure thread safety, and a copy of the global locale should be installed lazily on each thread. The FreeBSD implementation does not do this, for compatibility with Darwin. FreeBSD 14.1-RELEASE-p8 September 17, 2011 FreeBSD 14.1-RELEASE-p8