blob: 29359aa9a48438a3132f741266a1eb4b706b1fc9 [file] [log] [blame]
// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'dart:async';
import 'package:async_helper/async_minitest.dart';
const ms = const Duration(milliseconds: 1);
/// Allows two asynchronous executions to synchronize.
/// Calling [wait] and waiting for the returned future to complete will wait for
/// the other executions to call [wait] again. At that point, the waiting
/// execution is allowed to continue (the returned future completes), and the
/// more resent call to [wait] is now the waiting execution.
class Sync {
Completer? _completer = null;
// Release whoever is currently waiting and start waiting yourself.
Future wait([v]) {
_completer = Completer();
return _completer!.future;
// Release whoever is currently waiting.
void release([v]) {
_completer = null;
expectList(stream, list) {
return stream.toList().then((v) {
expect(v, equals(list));
Stream<int> mkStream(int n) async* {
for (int i = 0; i < n; i++) yield i;