Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/audaspace/include/util/Barrier.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 Barrier.h
+* @ingroup util
+* The Barrier class.
+*/
+
+#include "Audaspace.h"
+
+#include <mutex>
+#include <condition_variable>
+
+AUD_NAMESPACE_BEGIN
+/**
+* This represents a barrier mechanism for thread sychronization.
+*/
+class Barrier 
+{
+private:
+	/**
+	* A mutex needed to use a condition variable.
+	*/
+	std::mutex m_mutex;
+
+	/**
+	* Condition varieble used to sync threads.
+	*/
+	std::condition_variable m_condition;
+	
+	/**
+	* Number of threads that need to reach the barrier for it to lift.
+	*/
+	unsigned int m_threshold;
+
+	/**
+	* Conter that count from threshold to 0.
+	*/
+	unsigned int m_count;
+
+	/**
+	* Variable used for predicate check in the condition variable wait.
+	*/
+	unsigned int m_generation;
+
+	// delete copy constructor and operator=
+	Barrier(const Barrier&) = delete;
+	Barrier& operator=(const Barrier&) = delete;
+public:
+	/**
+	* Creates a new Barrier object.
+	* \param count the number of threads that need to reach the barrier for it to lift.
+	*/
+	Barrier(unsigned int count);
+	virtual ~Barrier();
+
+	/**
+	* Makes the caller thread wait until enough threads are stopped by this method.
+	*/
+	void wait();
+};
+AUD_NAMESPACE_END