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73 lines
2.1 KiB
C++
73 lines
2.1 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_SHELL_PLATFORM_WINDOWS_WIN32_TASK_RUNNER_H_
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#define FLUTTER_SHELL_PLATFORM_WINDOWS_WIN32_TASK_RUNNER_H_
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#include <windows.h>
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#include <chrono>
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#include <deque>
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#include <functional>
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#include <mutex>
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#include <queue>
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#include <thread>
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#include "flutter/shell/platform/embedder/embedder.h"
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namespace flutter {
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// A custom task runner that integrates with user32 GetMessage semantics so that
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// host app can own its own message loop and flutter still gets to process
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// tasks on a timely basis.
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class Win32TaskRunner {
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public:
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using TaskExpiredCallback = std::function<void(const FlutterTask*)>;
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Win32TaskRunner(DWORD main_thread_id,
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const TaskExpiredCallback& on_task_expired);
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~Win32TaskRunner();
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// Returns if the current thread is the thread used by the win32 event loop.
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bool RunsTasksOnCurrentThread() const;
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std::chrono::nanoseconds ProcessTasks();
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// Post a Flutter engine tasks to the event loop for delayed execution.
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void PostTask(FlutterTask flutter_task, uint64_t flutter_target_time_nanos);
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private:
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using TaskTimePoint = std::chrono::steady_clock::time_point;
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struct Task {
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uint64_t order;
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TaskTimePoint fire_time;
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FlutterTask task;
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struct Comparer {
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bool operator()(const Task& a, const Task& b) {
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if (a.fire_time == b.fire_time) {
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return a.order > b.order;
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}
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return a.fire_time > b.fire_time;
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}
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};
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};
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DWORD main_thread_id_;
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TaskExpiredCallback on_task_expired_;
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std::mutex task_queue_mutex_;
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std::priority_queue<Task, std::deque<Task>, Task::Comparer> task_queue_;
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std::condition_variable task_queue_cv_;
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Win32TaskRunner(const Win32TaskRunner&) = delete;
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Win32TaskRunner& operator=(const Win32TaskRunner&) = delete;
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static TaskTimePoint TimePointFromFlutterTime(
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uint64_t flutter_target_time_nanos);
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};
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} // namespace flutter
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#endif // FLUTTER_SHELL_PLATFORM_WINDOWS_WIN32_TASK_RUNNER_H_
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