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/* Copyright (C) 2022 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef INCLUDED_THREADING_TASKMANAGER
#define INCLUDED_THREADING_TASKMANAGER
#include "ps/Future.h"
#include <memory>
#include <vector>
namespace Threading
{
enum class TaskPriority
{
NORMAL,
LOW
};
/**
* The task manager creates all worker threads on initialisation,
* and manages the task queues.
* See implementation for additional comments.
*/
class TaskManager
{
friend class WorkerThread;
public:
TaskManager();
~TaskManager();
TaskManager(const TaskManager&) = delete;
TaskManager(TaskManager&&) = delete;
TaskManager& operator=(const TaskManager&) = delete;
TaskManager& operator=(TaskManager&&) = delete;
static void Initialise();
static TaskManager& Instance();
/**
* Clears all tasks from the queue. This blocks on started tasks.
*/
void ClearQueue();
/**
* @return the number of threaded workers.
*/
size_t GetNumberOfWorkers() const;
/**
* Push a task to be executed.
*/
template<typename T>
Future<std::invoke_result_t<T>> PushTask(T&& func, TaskPriority priority = TaskPriority::NORMAL)
{
Future<std::invoke_result_t<T>> ret;
DoPushTask(ret.Wrap(std::move(func)), priority);
return ret;
}
private:
TaskManager(size_t numberOfWorkers);
void DoPushTask(std::function<void()>&& task, TaskPriority priority);
class Impl;
std::unique_ptr<Impl> m;
};
} // namespace Threading
#endif // INCLUDED_THREADING_TASKMANAGER
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