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Fixes https://github.com/flutter/flutter/issues/152337 Introduces `ui_task_runner` field on `FlutterCustomTaskRunners`. This lets the embedder to specify task runner for UI isolate tasks, allowing for merging platform and UI threads. With custom UI task runner there is no `MessageLoop` anymore for the UI thread, so the message loop task observer can no longer be used to flush microtask queue. Instead the microtask queue is flushed at the end of each `FlutterEngineRunTask` invocation if needed. This is handled internally by the embedder. ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md --------- Co-authored-by: Jonah Williams <jonahwilliams@google.com> Co-authored-by: Loïc Sharma <737941+loic-sharma@users.noreply.github.com>
41 lines
1.0 KiB
C++
41 lines
1.0 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef FLUTTER_FML_TASK_QUEUE_ID_H_
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#define FLUTTER_FML_TASK_QUEUE_ID_H_
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#include "flutter/fml/logging.h"
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namespace fml {
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/**
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* `MessageLoopTaskQueues` task dispatcher's internal task queue identifier.
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*/
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class TaskQueueId {
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public:
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/// This constant indicates whether a task queue has been subsumed by a task
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/// runner.
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static const size_t kUnmerged;
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/// This constant indicates an invalid task queue. Used in embedder
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/// supplied task runners not associated with a task queue.
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static const size_t kInvalid;
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/// Intializes a task queue with the given value as it's ID.
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explicit TaskQueueId(size_t value) : value_(value) {}
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operator size_t() const { // NOLINT(google-explicit-constructor)
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return value_;
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}
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bool is_valid() const { return value_ != kInvalid; }
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private:
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size_t value_ = kUnmerged;
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};
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} // namespace fml
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#endif // FLUTTER_FML_TASK_QUEUE_ID_H_
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