+#ifdef LC_ALL_MASK
+
+/* Cache for the C locale object.
+ Marked volatile so that different threads see the same value
+ (avoids locking). */
+static volatile locale_t c_locale_cache;
+
+/* Return the C locale object, or (locale_t) 0 with errno set
+ if it cannot be created. */
+static inline locale_t
+c_locale (void)
+{
+ if (!c_locale_cache)
+ c_locale_cache = newlocale (LC_ALL_MASK, "C", (locale_t) 0);
+ return c_locale_cache;
+}
+
+#endif
+