- xbt_error_t gras_timer_cancel_delay(double interval, void_f_void_t action);
- xbt_error_t gras_timer_cancel_repeat(double interval, void_f_void_t action);
+ void gras_timer_cancel_delay(double interval, void_f_void_t action);
+ void gras_timer_cancel_repeat(double interval, void_f_void_t action);