-#define _nc_lock_global(name) pthread_mutex_lock(&_nc_globals.mutex_##name)
-#define _nc_unlock_global(name) pthread_mutex_unlock(&_nc_globals.mutex_##name)
+extern NCURSES_EXPORT(void) _nc_mutex_init(pthread_mutex_t *);
+extern NCURSES_EXPORT(int) _nc_mutex_lock(pthread_mutex_t *);
+extern NCURSES_EXPORT(int) _nc_mutex_trylock(pthread_mutex_t *);
+extern NCURSES_EXPORT(int) _nc_mutex_unlock(pthread_mutex_t *);
+#define _nc_lock_global(name) _nc_mutex_lock(&_nc_globals.mutex_##name)
+#define _nc_try_global(name) _nc_mutex_trylock(&_nc_globals.mutex_##name)
+#define _nc_unlock_global(name) _nc_mutex_unlock(&_nc_globals.mutex_##name)