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+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial Usage
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QREADWRITELOCK_H
+#define QREADWRITELOCK_H
+
+#include <QtCore/qglobal.h>
+#include <limits.h> // ### Qt 5: remove
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Core)
+
+#ifndef QT_NO_THREAD
+
+struct QReadWriteLockPrivate;
+
+class Q_CORE_EXPORT QReadWriteLock
+{
+public:
+ enum RecursionMode { NonRecursive, Recursive };
+
+ QReadWriteLock(); // ### Qt 5: merge with below
+ QReadWriteLock(RecursionMode recursionMode);
+ ~QReadWriteLock();
+
+ void lockForRead();
+ bool tryLockForRead();
+ bool tryLockForRead(int timeout);
+
+ void lockForWrite();
+ bool tryLockForWrite();
+ bool tryLockForWrite(int timeout);
+
+ void unlock();
+
+private:
+ Q_DISABLE_COPY(QReadWriteLock)
+ QReadWriteLockPrivate *d;
+
+ friend class QWaitCondition;
+};
+
+#if defined(Q_CC_MSVC)
+#pragma warning( push )
+#pragma warning( disable : 4312 ) // ignoring the warning from /Wp64
+#endif
+
+class Q_CORE_EXPORT QReadLocker
+{
+public:
+ inline QReadLocker(QReadWriteLock *readWriteLock);
+
+ inline ~QReadLocker()
+ { unlock(); }
+
+ inline void unlock()
+ {
+ if (q_lock) {
+ if ((q_val & quintptr(1u)) == quintptr(1u)) {
+ q_val &= ~quintptr(1u);
+ q_lock->unlock();
+ }
+ }
+ }
+
+ inline void relock()
+ {
+ if (q_lock) {
+ if ((q_val & quintptr(1u)) == quintptr(0u)) {
+ q_lock->lockForRead();
+ q_val |= quintptr(1u);
+ }
+ }
+ }
+
+ inline QReadWriteLock *readWriteLock() const
+ { return reinterpret_cast<QReadWriteLock *>(q_val & ~quintptr(1u)); }
+
+private:
+ Q_DISABLE_COPY(QReadLocker)
+ union {
+ QReadWriteLock *q_lock;
+ quintptr q_val;
+ };
+};
+
+inline QReadLocker::QReadLocker(QReadWriteLock *areadWriteLock)
+ : q_lock(areadWriteLock)
+{
+ Q_ASSERT_X((q_val & quintptr(1u)) == quintptr(0),
+ "QReadLocker", "QReadWriteLock pointer is misaligned");
+ relock();
+}
+
+class Q_CORE_EXPORT QWriteLocker
+{
+public:
+ inline QWriteLocker(QReadWriteLock *readWriteLock);
+
+ inline ~QWriteLocker()
+ { unlock(); }
+
+ inline void unlock()
+ {
+ if (q_lock) {
+ if ((q_val & quintptr(1u)) == quintptr(1u)) {
+ q_val &= ~quintptr(1u);
+ q_lock->unlock();
+ }
+ }
+ }
+
+ inline void relock()
+ {
+ if (q_lock) {
+ if ((q_val & quintptr(1u)) == quintptr(0u)) {
+ q_lock->lockForWrite();
+ q_val |= quintptr(1u);
+ }
+ }
+ }
+
+ inline QReadWriteLock *readWriteLock() const
+ { return reinterpret_cast<QReadWriteLock *>(q_val & ~quintptr(1u)); }
+
+
+private:
+ Q_DISABLE_COPY(QWriteLocker)
+ union{
+ QReadWriteLock *q_lock;
+ quintptr q_val;
+ };
+};
+
+inline QWriteLocker::QWriteLocker(QReadWriteLock *areadWriteLock)
+ : q_lock(areadWriteLock)
+{
+ Q_ASSERT_X((q_val & quintptr(1u)) == quintptr(0),
+ "QWriteLocker", "QReadWriteLock pointer is misaligned");
+ relock();
+}
+
+#if defined(Q_CC_MSVC)
+#pragma warning( pop )
+#endif
+
+#else // QT_NO_THREAD
+
+class Q_CORE_EXPORT QReadWriteLock
+{
+public:
+ enum RecursionMode { NonRecursive, Recursive };
+ inline explicit QReadWriteLock(RecursionMode = NonRecursive) { }
+ inline ~QReadWriteLock() { }
+
+ static inline void lockForRead() { }
+ static inline bool tryLockForRead() { return true; }
+ static inline bool tryLockForRead(int timeout) { Q_UNUSED(timeout); return true; }
+
+ static inline void lockForWrite() { }
+ static inline bool tryLockForWrite() { return true; }
+ static inline bool tryLockForWrite(int timeout) { Q_UNUSED(timeout); return true; }
+
+ static inline void unlock() { }
+
+private:
+ Q_DISABLE_COPY(QReadWriteLock)
+};
+
+class Q_CORE_EXPORT QReadLocker
+{
+public:
+ inline QReadLocker(QReadWriteLock *) { }
+ inline ~QReadLocker() { }
+
+ static inline void unlock() { }
+ static inline void relock() { }
+ static inline QReadWriteLock *readWriteLock() { return 0; }
+
+private:
+ Q_DISABLE_COPY(QReadLocker)
+};
+
+class Q_CORE_EXPORT QWriteLocker
+{
+public:
+ inline explicit QWriteLocker(QReadWriteLock *) { }
+ inline ~QWriteLocker() { }
+
+ static inline void unlock() { }
+ static inline void relock() { }
+ static inline QReadWriteLock *readWriteLock() { return 0; }
+
+private:
+ Q_DISABLE_COPY(QWriteLocker)
+};
+
+#endif // QT_NO_THREAD
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QREADWRITELOCK_H