Semaphore in flutter

Question

Code:

void _test() {
  print(1);
  Timer.run(() {
    print(2);
  });
  print(3);
}

Print 1 3 2.

I want print 1 2 3.

In iOS I can use Semaphore, how can I do this in flutter?

Answer 1

Thanks @jamesdlin, I solved with his comment, below is desired code:

void _test() async {
  print(1);
  Completer<void> completer = Completer();
  Timer.run(() {
    print(2);
    completer.complete();
  });
  await completer.future;
  print(3);
}