John McCutchan
291befa1cd
A TimelineTask represents an asynchronous track of operations on the timeline.
The old API allowed multiple isolates to emit events simultaneously on the same task or to start / finish events in any order. This isn't supported by our UI and probably many other tools that consume trace-event.
With this change, operations within a TimelineTask must complete in the reverse order of their start calls (aka a stack). You can pass a TimelineTask from one isolate to another but you must first complete all open operations before passing it.
Example:
var task = new TimelineTask();
task.start('Some phase');
await someFuture;
task.finish();
Also: Add support for instant events.
R=rmacnak@google.com
Review URL: https://codereview.chromium.org/1412183008 .
24 lines
567 B
Dart
24 lines
567 B
Dart
// Copyright (c) 2015, 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:developer';
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import 'package:expect/expect.dart';
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void testUnbalancedStartFinish() {
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Timeline.startSync('A');
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Timeline.finishSync();
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bool exceptionCaught = false;
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try {
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Timeline.finishSync();
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} catch (e) {
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exceptionCaught = true;
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}
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Expect.isTrue(exceptionCaught);
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}
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void main() {
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testUnbalancedStartFinish();
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}
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