PERLVAR(G, hints_mutex, perl_mutex) /* Mutex for refcounted he refcounting */
PERLVAR(G, locale_mutex, perl_mutex) /* Mutex for setlocale() changing */
-# ifdef HAS_NEWLOCALE
-PERLVAR(G, C_locale_obj, locale_t)
-# endif
+#endif
+/* Proxy for HAS_POSIX_2008_LOCALE, since that is not defined in time for this */
+#if defined(HAS_NEWLOCALE) && ! defined(NO_POSIX_2008_LOCALE)
+PERLVAR(G, C_locale_obj, locale_t)
#endif
#ifdef DEBUGGING
handle keywords, and only the last function in the chain (built into
the Perl core) will normally return C<KEYWORD_PLUGIN_DECLINE>.
+For thread safety, modules should not set this variable directly.
+Instead, use the function L</wrap_keyword_plugin>.
+
=cut
*/
+#if defined(USE_ITHREADS)
+PERLVAR(G, keyword_plugin_mutex, perl_mutex) /* Mutex for PL_keyword_plugin */
+#endif
PERLVARI(G, keyword_plugin, Perl_keyword_plugin_t, Perl_keyword_plugin_standard)
PERLVARI(G, op_sequence, HV *, NULL) /* dump.c */