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+/****************************************************************************
+**
+** Copyright (C) 2008-2012 NVIDIA Corporation.
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef QT3DS_FOUNDATION_THREAD_SAFE_QUEUE_H
+#define QT3DS_FOUNDATION_THREAD_SAFE_QUEUE_H
+#include "foundation/Qt3DSMutex.h"
+#include "foundation/Qt3DSSemaphore.h"
+#include "EASTL/vector.h"
+
+namespace qt3ds {
+namespace foundation {
+
+ template <typename TObjType, typename TAllocator = EASTLAllocatorType>
+ class ThreadSafeQueue
+ {
+ public:
+ static const QT3DSU32 MaxQueue = 0xffffffff;
+
+ protected:
+ eastl::vector<TObjType, TAllocator> mQueue;
+ Semaphore mGetSemaphore;
+ Semaphore mPutSemaphore;
+ Mutex mMutex;
+ const QT3DSU32 mMaxCount;
+
+ public:
+ ThreadSafeQueue(NVAllocatorCallback &alloc, QT3DSU32 maxCount = MaxQueue)
+ : mMutex(alloc)
+ , mGetSemaphore(alloc, 0, maxCount)
+ , mPutSemaphore(alloc, maxCount, maxCount)
+ , mMaxCount(maxCount)
+ {
+ mQueue.clear();
+ }
+
+ bool push(const TObjType &obj, QT3DSU32 milliseconds = MaxQueue)
+ {
+ if (mPutSemaphore.wait(milliseconds)) {
+ Mutex::ScopedLock __locker(mMutex);
+ mQueue.push_back(obj);
+ mGetSemaphore.post();
+ return true;
+ }
+ return false;
+ }
+
+ bool pop(TObjType &obj, QT3DSU32 milliseconds = 0)
+ {
+ if (mGetSemaphore.wait(milliseconds)) {
+ Mutex::ScopedLock __locker(mMutex);
+ obj = mQueue.back();
+ mQueue.pop_back();
+ mPutSemaphore.post();
+ return true;
+ }
+ return false;
+ }
+
+ bool isFull()
+ {
+ Mutex::ScopedLock __locker(mMutex);
+ return mQueue.size() >= mMaxCount;
+ }
+
+ bool isEmpty()
+ {
+ Mutex::ScopedLock __locker(mMutex);
+ return mQueue.size() == 0;
+ }
+
+ void clear()
+ {
+ Mutex::ScopedLock __locker(mMutex);
+ while (!mQueue.empty()) {
+ if (mGetSemaphore.wait(MaxQueue)) {
+ mQueue.pop_back();
+ mPutSemaphore.post();
+ }
+ }
+ }
+ };
+}
+}
+
+#endif \ No newline at end of file