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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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "foundation/Qt3DS.h"
#include "foundation/Qt3DSMutex.h"
#include "foundation/Qt3DSAssert.h"
#include "foundation/Qt3DSAtomic.h"
#include <pthread.h>
namespace qt3ds {
namespace foundation {
namespace {
pthread_mutex_t *getMutex(MutexImpl *impl)
{
return reinterpret_cast<pthread_mutex_t *>(impl);
}
}
MutexImpl::MutexImpl()
{
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(getMutex(this), &attr);
pthread_mutexattr_destroy(&attr);
}
MutexImpl::~MutexImpl() { pthread_mutex_destroy(getMutex(this)); }
bool MutexImpl::lock() { return !pthread_mutex_lock(getMutex(this)); }
bool MutexImpl::trylock() { return !pthread_mutex_trylock(getMutex(this)); }
bool MutexImpl::unlock() { return !pthread_mutex_unlock(getMutex(this)); }
const QT3DSU32 MutexImpl::size = sizeof(pthread_mutex_t);
class ReadWriteLockImpl
{
public:
ReadWriteLockImpl(NVAllocatorCallback &alloc)
: mAllocator(alloc)
{
}
NVAllocatorCallback &mAllocator;
pthread_mutex_t mutex;
volatile int readerCounter;
};
ReadWriteLock::ReadWriteLock(NVAllocatorCallback &alloc)
{
mImpl = QT3DS_NEW(alloc, ReadWriteLockImpl)(alloc);
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&mImpl->mutex, &attr);
pthread_mutexattr_destroy(&attr);
mImpl->readerCounter = 0;
}
ReadWriteLock::~ReadWriteLock()
{
pthread_mutex_destroy(&mImpl->mutex);
QT3DS_FREE(mImpl->mAllocator, mImpl);
}
void ReadWriteLock::lockReader()
{
pthread_mutex_lock(&mImpl->mutex);
atomicIncrement(&mImpl->readerCounter);
pthread_mutex_unlock(&mImpl->mutex);
}
void ReadWriteLock::lockWriter()
{
pthread_mutex_lock(&mImpl->mutex);
while (mImpl->readerCounter != 0)
;
}
void ReadWriteLock::unlockReader() { atomicDecrement(&mImpl->readerCounter); }
void ReadWriteLock::unlockWriter() { pthread_mutex_unlock(&mImpl->mutex); }
} // namespace foundation
} // namespace qt3ds
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