100 lines
2.7 KiB
C++
100 lines
2.7 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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*/
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#pragma once
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namespace base {
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using Task = lambda<void()>;
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// An attempt to create/use a TaskQueue or one of the default queues
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// after the main() has returned leads to an undefined behaviour.
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class TaskQueue {
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enum class Type {
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Main, // Unique queue for main thread tasks.
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Serial,
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Concurrent,
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Special, // Unique special queue for thread pool lists terminal item.
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};
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public:
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enum class Priority {
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Normal,
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Background,
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};
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// Creating custom serial queues.
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TaskQueue(Priority priority) : TaskQueue(Type::Serial, priority) {
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}
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// Default main and two concurrent queues.
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static TaskQueue &Main();
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static TaskQueue &Normal();
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static TaskQueue &Background();
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void Put(Task &&task);
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static void ProcessMainTasks();
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static void ProcessMainTasks(TimeMs max_time_spent);
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~TaskQueue();
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private:
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static bool ProcessOneMainTask();
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TaskQueue(Type type, Priority priority);
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bool IsMyThread() const;
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bool SerialTaskInProcess() const {
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return (destroyed_flag_ != nullptr);
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}
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const Type type_;
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const Priority priority_;
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QList<Task*> tasks_; // TODO: std_::deque_of_moveable<Task>
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QMutex tasks_mutex_; // Only for the main queue.
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// Only for the other queues, not main.
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class TaskThreadPool;
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QWeakPointer<TaskThreadPool> weak_thread_pool_;
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class TaskQueueList;
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struct TaskQueueListEntry {
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TaskQueue *before = nullptr;
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TaskQueue *after = nullptr;
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};
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// Thread pool queues linked list.
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static constexpr int kAllQueuesList = 0;
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// Thread pool queues linked list with excluded Background queues.
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static constexpr int kOnlyNormalQueuesList = 1;
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static constexpr int kQueuesListsCount = 2;
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TaskQueueListEntry list_entries_[kQueuesListsCount];
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// Only for Serial queues: non-null value means a task is currently processed.
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bool *destroyed_flag_ = nullptr;
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};
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} // namespace base
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