all, collate, ctype, messages,
monetary, numeric or time. For
details, please consult the C library locale documentation. See also section
2.19.1. Please note that the locale is shared between all threads
and thread-safe usage of setlocale/3
is in general not possible. Do locale operations before starting threads
or thoroughly study threading aspects of locale support in your
environment before using in multithreaded environments. Locale settings
are used by format_time/3, collation_key/2
and locale_sort/2.
The messages locale defines the language used by
print_message/2.
Note that this locale is not available on all operating system. Notably
Windows does not support this category. See
win_get_user_preferred_ui_languages/2.