Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/audaspace/include/util/ThreadPool.h

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+/*******************************************************************************
+* Copyright 2015-2016 Juan Francisco Crespo Galán
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*   http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+******************************************************************************/
+
+#pragma once
+
+/**
+* @file ThreadPool.h
+* @ingroup util
+* The ThreadPool class.
+*/
+
+#include "Audaspace.h"
+
+#include <mutex>
+#include <condition_variable>
+#include <vector>
+#include <thread>
+#include <queue>
+#include <future>
+#include <functional>
+
+AUD_NAMESPACE_BEGIN
+/**
+* This represents pool of threads.
+*/
+class AUD_API ThreadPool
+{
+private:
+	/** 
+	* A queue of tasks.
+	*/
+	std::queue<std::function<void()>> m_queue;
+
+	/**
+	* A vector of thread objects.
+	*/
+	std::vector<std::thread> m_threads;
+
+	/**
+	* A mutex for synchronization.
+	*/
+	std::mutex m_mutex;
+
+	/**
+	* A condition variable used to stop the threads when there are no tasks.
+	*/
+	std::condition_variable m_condition;
+
+	/**
+	* Stop flag.
+	*/
+	bool m_stopFlag;
+
+	/**
+	* The number fo threads.
+	*/
+	unsigned int m_numThreads;
+
+	// delete copy constructor and operator=
+	ThreadPool(const ThreadPool&) = delete;
+	ThreadPool& operator=(const ThreadPool&) = delete;
+public:
+	/**
+	* Creates a new ThreadPool object.
+	* \param count The number of threads of the pool. It must not be 0.
+	*/
+	ThreadPool(unsigned int count);
+
+	virtual ~ThreadPool();
+
+	/**
+	* Enqueues a new task for the threads to realize.
+	* \param t A function that realices a task.
+	* \param args The arguments of the task.
+	* \return A future of the same type as the return type of the task.
+	*/
+	template<class T, class... Args>
+	auto enqueue(T&& t, Args&&... args)
+	{
+		using pkgdTask = std::packaged_task<typename std::invoke_result<T, Args...>::type()>;
+
+		std::shared_ptr<pkgdTask> task = std::make_shared<pkgdTask>(std::bind(std::forward<T>(t), std::forward<Args>(args)...));
+		auto result = task->get_future();
+
+		m_mutex.lock();
+		m_queue.emplace([task]() { (*task)(); });
+		m_mutex.unlock();
+
+		m_condition.notify_one();
+		return result;
+	}
+
+	/**
+	* Retrieves the number of threads of the pool.
+	* \return The number of threads.
+	*/
+	unsigned int getNumOfThreads();
+
+private:
+
+	/**
+	* Worker thread function.
+	*/
+	void threadFunction();
+};
+AUD_NAMESPACE_END