-xbt_os_timer_t xbt_os_timer_new(void);
-void xbt_os_timer_free(xbt_os_timer_t timer);
-void xbt_os_timer_start(xbt_os_timer_t timer);
-void xbt_os_timer_stop(xbt_os_timer_t timer);
-double xbt_os_timer_elapsed(xbt_os_timer_t timer);
+XBT_PUBLIC xbt_os_timer_t xbt_os_timer_new(void);
+XBT_PUBLIC void xbt_os_timer_free(xbt_os_timer_t timer);
+XBT_PUBLIC void xbt_os_timer_start(xbt_os_timer_t timer);
+XBT_PUBLIC void xbt_os_timer_stop(xbt_os_timer_t timer);
+XBT_PUBLIC double xbt_os_timer_elapsed(xbt_os_timer_t timer);