Suspend

Parks this task's work until question is answered. update commits with the superstep like any other; the run then pauses at the end of the superstep - siblings finish and commit, but no further superstep starts until a resume. The answer schedules resumeAt with Resumed(question, answer). That continuation stands in for this task: it fills this task's join arrival, so a barrier this task belongs to stays closed until the continuation completes.