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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
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