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After pre-roll we know if there have been any mutations made to the IOS embedded UIViews. If there are any mutations and the thread configuration is such chat the mutations will be committed on an illegal thread (GPU thread), we merge the threads and keep them merged until the lease expires. The lease is currently set to expire after 10 frames of no mutations. If there are any mutations in the interim we extend the lease. TaskRunnerMerger will ultimately be responsible for enforcing the correct thread configurations. This configuration will be inactive even after this change since still use the same thread when we create the iOS engine. That is slated to change in the coming PRs.
64 lines
1.3 KiB
C++
64 lines
1.3 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_MESSAGE_LOOP_H_
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#define FLUTTER_FML_MESSAGE_LOOP_H_
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#include "flutter/fml/macros.h"
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#include "flutter/fml/task_runner.h"
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namespace fml {
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class TaskRunner;
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class MessageLoopImpl;
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class MessageLoop {
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public:
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FML_EMBEDDER_ONLY
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static MessageLoop& GetCurrent();
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bool IsValid() const;
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void Run();
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void Terminate();
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void AddTaskObserver(intptr_t key, fml::closure callback);
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void RemoveTaskObserver(intptr_t key);
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fml::RefPtr<fml::TaskRunner> GetTaskRunner() const;
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// Exposed for the embedder shell which allows clients to poll for events
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// instead of dedicating a thread to the message loop.
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void RunExpiredTasksNow();
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void SwapTaskQueues(MessageLoop* other);
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static void EnsureInitializedForCurrentThread();
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static bool IsInitializedForCurrentThread();
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~MessageLoop();
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static TaskQueueId GetCurrentTaskQueueId();
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private:
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friend class TaskRunner;
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friend class MessageLoopImpl;
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fml::RefPtr<MessageLoopImpl> loop_;
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fml::RefPtr<fml::TaskRunner> task_runner_;
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MessageLoop();
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fml::RefPtr<MessageLoopImpl> GetLoopImpl() const;
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FML_DISALLOW_COPY_AND_ASSIGN(MessageLoop);
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};
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} // namespace fml
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#endif // FLUTTER_FML_MESSAGE_LOOP_H_
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