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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QREADWRITELOCK_H
#define QREADWRITELOCK_H
#include <QtCore/qglobal.h>
QT_BEGIN_NAMESPACE
#if QT_CONFIG(thread)
class QReadWriteLockPrivate;
class Q_CORE_EXPORT QReadWriteLock
{
public:
enum RecursionMode { NonRecursive, Recursive };
explicit QReadWriteLock(RecursionMode recursionMode = NonRecursive);
~QReadWriteLock();
void lockForRead();
bool tryLockForRead();
bool tryLockForRead(int timeout);
void lockForWrite();
bool tryLockForWrite();
bool tryLockForWrite(int timeout);
void unlock();
private:
Q_DISABLE_COPY(QReadWriteLock)
QAtomicPointer<QReadWriteLockPrivate> d_ptr;
enum StateForWaitCondition { LockedForRead, LockedForWrite, Unlocked, RecursivelyLocked };
StateForWaitCondition stateForWaitCondition() const;
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_val) {
if ((q_val & quintptr(1u)) == quintptr(1u)) {
q_val &= ~quintptr(1u);
readWriteLock()->unlock();
}
}
}
inline void relock()
{
if (q_val) {
if ((q_val & quintptr(1u)) == quintptr(0u)) {
readWriteLock()->lockForRead();
q_val |= quintptr(1u);
}
}
}
inline QReadWriteLock *readWriteLock() const
{ return reinterpret_cast<QReadWriteLock *>(q_val & ~quintptr(1u)); }
private:
Q_DISABLE_COPY(QReadLocker)
quintptr q_val;
};
inline QReadLocker::QReadLocker(QReadWriteLock *areadWriteLock)
: q_val(reinterpret_cast<quintptr>(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_val) {
if ((q_val & quintptr(1u)) == quintptr(1u)) {
q_val &= ~quintptr(1u);
readWriteLock()->unlock();
}
}
}
inline void relock()
{
if (q_val) {
if ((q_val & quintptr(1u)) == quintptr(0u)) {
readWriteLock()->lockForWrite();
q_val |= quintptr(1u);
}
}
}
inline QReadWriteLock *readWriteLock() const
{ return reinterpret_cast<QReadWriteLock *>(q_val & ~quintptr(1u)); }
private:
Q_DISABLE_COPY(QWriteLocker)
quintptr q_val;
};
inline QWriteLocker::QWriteLocker(QReadWriteLock *areadWriteLock)
: q_val(reinterpret_cast<quintptr>(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_CONFIG(thread)
class Q_CORE_EXPORT QReadWriteLock
{
public:
enum RecursionMode { NonRecursive, Recursive };
inline explicit QReadWriteLock(RecursionMode = NonRecursive) noexcept { }
inline ~QReadWriteLock() { }
void lockForRead() noexcept { }
bool tryLockForRead() noexcept { return true; }
bool tryLockForRead(int timeout) noexcept { Q_UNUSED(timeout); return true; }
void lockForWrite() noexcept { }
bool tryLockForWrite() noexcept { return true; }
bool tryLockForWrite(int timeout) noexcept { Q_UNUSED(timeout); return true; }
void unlock() noexcept { }
private:
Q_DISABLE_COPY(QReadWriteLock)
};
class Q_CORE_EXPORT QReadLocker
{
public:
inline explicit QReadLocker(QReadWriteLock *) noexcept { }
inline ~QReadLocker() noexcept { }
void unlock() noexcept { }
void relock() noexcept { }
QReadWriteLock *readWriteLock() noexcept { return nullptr; }
private:
Q_DISABLE_COPY(QReadLocker)
};
class Q_CORE_EXPORT QWriteLocker
{
public:
inline explicit QWriteLocker(QReadWriteLock *) noexcept { }
inline ~QWriteLocker() noexcept { }
void unlock() noexcept { }
void relock() noexcept { }
QReadWriteLock *readWriteLock() noexcept { return nullptr; }
private:
Q_DISABLE_COPY(QWriteLocker)
};
#endif // QT_CONFIG(thread)
QT_END_NAMESPACE
#endif // QREADWRITELOCK_H
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