Method checkShutdown

fdbrpc/sim2.actor.cpp:926–930

		return f;
	}
	ACTOR static Future<Void> checkShutdown(Sim2* self, TaskPriority taskID) {
		wait(success(self->getCurrentProcess()->shutdownSignal.getFuture()));
		self->setCurrentTask(taskID);
		return Void();
	}
	Future<class Void> yield(TaskPriority taskID) override {
		if (taskID == TaskPriority::DefaultYield)
			taskID = currentTaskID;