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+/* Table that maps a locale object to the names of the locale categories.
+ Copyright (C) 2018-2022 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2018. */
+
+#if HAVE_WORKING_USELOCALE && HAVE_NAMELESS_LOCALES
+
+# include <stddef.h>
+# include <locale.h>
+
+# include "glthread/lock.h"
+
+struct locale_categories_names
+ {
+ /* Locale category -> name (allocated with indefinite extent). */
+ const char *category_name[6];
+ };
+
+/* A hash table of fixed size. Multiple threads can access it read-only
+ simultaneously, but only one thread can insert into it or remove from it
+ at the same time.
+ This hash table has global scope, so that when an application uses both
+ GNU libintl and gnulib, the application sees only one hash table. (When
+ linking statically with libintl, the fact that localename-table.c is a
+ separate compilation unit resolves the duplicate symbol conflict. When
+ linking with libintl as a shared library, we rely on ELF and the symbol
+ conflict resolution implemented in the ELF dynamic loader here.)
+ Both the libintl overrides and the gnulib overrides of the functions
+ newlocale, duplocale, freelocale see the same hash table (and the same lock).
+ For this reason, the internal layout of the hash table and the hash function
+ MUST NEVER CHANGE. If you need to change the internal layout or the hash
+ function, introduce versioning by appending a version suffix to the symbols
+ at the linker level. */
+# define locale_hash_function libintl_locale_hash_function
+# define locale_hash_table libintl_locale_hash_table
+# define locale_lock libintl_locale_lock
+
+extern size_t _GL_ATTRIBUTE_CONST locale_hash_function (locale_t x);
+
+/* A node in a hash bucket collision list. */
+struct locale_hash_node
+ {
+ struct locale_hash_node *next;
+ locale_t locale;
+ struct locale_categories_names names;
+ };
+
+# define LOCALE_HASH_TABLE_SIZE 101
+extern struct locale_hash_node * locale_hash_table[LOCALE_HASH_TABLE_SIZE];
+
+/* This lock protects the locale_hash_table against multiple simultaneous
+ accesses (except that multiple simultaneous read accesses are allowed). */
+
+gl_rwlock_define(extern, locale_lock)
+
+#endif