How to simulate long time process (sleep) in Dart?

Question

I want to stop/sleep executing to simulate long time process, unfortunately I can't find information about it. I've read the following topic (How can I "sleep" a Dart program), but it isn't what I look for.

For example sleep() function from dart:io packages isn't applicable, because this package is not available in a browser.

For example:

import 'dart:html';
main() {
  // I want to "sleep"/hang executing during several seconds
  // and only then run the rest of function's body
  querySelect('#loading').remove();
  ...other functions and actions...
}

I know that there is Timer class to make callbacks after some time, but still it doesn't prevent the execution of program as a whole.

score 3 · Accepted Answer · edited Jul 07 '22 at 01:54

3

There is no way to stop execution. You can either use a Timer, Future.delayed, or just use an endless loop which only ends after certain time has passed.

edited Jul 07 '22 at 01:54

answered Apr 15 '15 at 12:03

Günter Zöchbauer

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1

Thanks Gunter, I like answers like this) Strict, idiomatic and simple – Timur Fayzrakhmanov Apr 15 '15 at 12:14

score 2 · Answer 2 · answered Apr 18 '15 at 18:56

If you want a stop the world sleeping function, you could do it entirely yourself. I will mention that I don't recommend you do this, it's a very bad idea to stop the world, but if you really want it:

void sleep(Duration duration) {
  var ms = duration.inMilliseconds;
  var start = new DateTime.now().millisecondsSinceEpoch;
  while (true) {
    var current = new DateTime.now().millisecondsSinceEpoch;
    if (current - start >= ms) {
      break;
    }
  }
}

void main() {
  print("Begin.");
  sleep(new Duration(seconds: 2));
  print("End.");
}

Very interesting approach!) Thank you for suggestion! – Timur Fayzrakhmanov Apr 19 '15 at 05:46 — Timur Fayzrakhmanov, Apr 19 '15 at 05:46

How to simulate long time process (sleep) in Dart?

2 Answers2