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30 .Dd September 17, 2011
35 .Nd duplicate an locale
41 .Fn duplocale "locale_t locale"
43 Duplicates an existing
47 that refers to the same locale values but has an independent internal state.
48 Various functions, such as
50 require a persistent state.
51 These functions formerly used static variables and calls to them from multiple
52 threads had undefined behavior.
53 They now use fields in the
55 associated with the current thread by
57 These calls are therefore only thread safe on threads with a unique per-thread
59 The locale returned by this call must be freed with
69 This function conforms to
74 should make a copy of the
76 implicitly to ensure thread safety,
77 and a copy of the global locale should be installed lazily on each thread.
78 The FreeBSD implementation does not do this,
79 for compatibility with Darwin.