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b81f12a549
Change-Id: I0fa2ee2561dd0bc399d88868d790d56e6df3c94d Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/134940 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Lasse R.H. Nielsen <lrn@google.com>
42 lines
1.2 KiB
Dart
42 lines
1.2 KiB
Dart
// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'dart:async';
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import 'package:async_helper/async_minitest.dart';
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const ms = const Duration(milliseconds: 1);
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/// Allows two asynchronous executions to synchronize.
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///
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/// Calling [wait] and waiting for the returned future to complete will wait for
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/// the other executions to call [wait] again. At that point, the waiting
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/// execution is allowed to continue (the returned future completes), and the
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/// more resent call to [wait] is now the waiting execution.
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class Sync {
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Completer? _completer = null;
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// Release whoever is currently waiting and start waiting yourself.
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Future wait([v]) {
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_completer?.complete(v);
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_completer = Completer();
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return _completer!.future;
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}
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// Release whoever is currently waiting.
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void release([v]) {
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_completer?.complete(v);
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_completer = null;
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}
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}
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expectList(stream, list) {
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return stream.toList().then((v) {
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expect(v, equals(list));
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});
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}
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Stream<int> mkStream(int n) async* {
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for (int i = 0; i < n; i++) yield i;
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}
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