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Diffstat (limited to 'src/foundation/macos/Qt3DSUnixMutex.cpp')
-rw-r--r-- | src/foundation/macos/Qt3DSUnixMutex.cpp | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/src/foundation/macos/Qt3DSUnixMutex.cpp b/src/foundation/macos/Qt3DSUnixMutex.cpp new file mode 100644 index 0000000..bbc5582 --- /dev/null +++ b/src/foundation/macos/Qt3DSUnixMutex.cpp @@ -0,0 +1,120 @@ +/**************************************************************************** +** +** 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 |