Derek Xu
1d69b0b980
This change makes it so that when the VM detects that a timer is at least 100 ms overdue, it sends a warning in a VM Service event on the 'Timer' stream. TEST=Built an Android Flutter app with a modified Engine that contained a `sleep` call in `eventhandler_linux.cc` and confirmed that the warning event got sent, built an iOS Flutter app with a modified Engine that contained a `sleep` call in `eventhandler_macos.cc` and verified that the warning event got sent, pkg/vm_service/test/overdue_timer_detection_test CoreLibraryReviewExempt: This CL does not include any core library API changes, only VM Service implementation changes. Change-Id: Ie8db047116b7f63cfb5413f763eaf56c7bdd6975 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/409500 Reviewed-by: Ben Konyi <bkonyi@google.com> Commit-Queue: Derek Xu <derekx@google.com>
67 lines
2.0 KiB
Dart
67 lines
2.0 KiB
Dart
// Copyright (c) 2025, 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 'dart:io' show sleep;
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import 'package:test/test.dart';
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import 'package:vm_service/vm_service.dart';
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import 'common/service_test_common.dart';
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import 'common/test_helper.dart';
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Future<void> testeeMain() async {
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final completer = Completer<void>();
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late final Timer t;
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t = Timer(
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const Duration(milliseconds: 100),
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() {
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t.cancel();
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completer.complete();
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},
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);
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// Sleep for 201 ms to force [t] to fire at least 100 ms late. This allows us
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// to expect to receive at least one 'TimerSignificantlyOverdue' event in
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// [tests] below, because a 'TimerSignificantlyOverdue' event should be fired
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// whenever a timer is identified to be at least 100 ms overdue.
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sleep(const Duration(milliseconds: 201));
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await completer.future;
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}
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final tests = <IsolateTest>[
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hasPausedAtStart,
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(VmService service, IsolateRef isolateRef) async {
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final completer = Completer<void>();
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late final StreamSubscription<Event> sub;
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sub = service.onTimerEvent.listen((Event event) async {
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if (event.kind == 'TimerSignificantlyOverdue') {
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final detailsRegex = RegExp(
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r'A timer should have fired (\d+) ms ago, but just fired now.',
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);
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final millisecondsOverdueAsString =
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detailsRegex.firstMatch(event.details!)!.group(1)!;
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expect(
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int.parse(millisecondsOverdueAsString),
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greaterThanOrEqualTo(100),
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);
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await sub.cancel();
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completer.complete();
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}
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});
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await service.streamListen(EventStreams.kTimer);
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await service.resume(isolateRef.id!);
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await completer.future;
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},
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];
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Future<void> main([args = const <String>[]]) => runIsolateTests(
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args,
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tests,
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'overdue_timer_detection_test.dart',
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testeeConcurrent: testeeMain,
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pauseOnStart: true,
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);
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