/** Blocks until the activity is terminated, or until the timeout is elapsed
* Raises: timeout exception.*/
virtual Activity* wait_for(double timeout) = 0;
+ /** Blocks until the activity is terminated, or until the time limit is reached
+ * Raises: timeout exception. */
+ void wait_until(double time_limit);
+
/** Cancel that activity */
virtual Activity* cancel() = 0;
/** Retrieve the current state of the activity */
