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qreadwritelock.h

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**
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**
** This file is part of the QtCore module of the Qt Toolkit.
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** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
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** additional rights. These rights are described in the Trolltech GPL
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#ifndef QREADWRITELOCK_H
#define QREADWRITELOCK_H

#include <QtCore/qglobal.h>
#include <limits.h>

QT_BEGIN_HEADER

QT_MODULE(Core)

#ifndef QT_NO_THREAD

struct QReadWriteLockPrivate;

00058 class Q_CORE_EXPORT QReadWriteLock
{
public:
    QReadWriteLock();
    ~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;
};

00079 class Q_CORE_EXPORT QReadLocker
{
public:
    inline QReadLocker(QReadWriteLock *readWriteLock);

00084     inline ~QReadLocker()
    { unlock(); }

00087     inline void unlock()
    {
        if (q_lock) {
            if ((q_val & quintptr(1u)) == quintptr(1u)) {
                q_val &= ~quintptr(1u);
                q_lock->unlock();
            }
        }
    }

00097     inline void relock()
    {
        if (q_lock) {
            if ((q_val & quintptr(1u)) == quintptr(0u)) {
                q_lock->lockForRead();
                q_val |= quintptr(1u);
            }
        }
    }

00107     inline QReadWriteLock *readWriteLock() const
    { return reinterpret_cast<QReadWriteLock *>(q_val & ~quintptr(1u)); }

private:
    Q_DISABLE_COPY(QReadLocker)
    union {
        QReadWriteLock *q_lock;
        quintptr q_val;
    };
};

00118 inline QReadLocker::QReadLocker(QReadWriteLock *areadWriteLock)
    : q_lock(areadWriteLock)
{ relock(); }

00122 class Q_CORE_EXPORT QWriteLocker
{
public:
    inline QWriteLocker(QReadWriteLock *readWriteLock);

00127     inline ~QWriteLocker()
    { unlock(); }

00130     inline void unlock()
    {
        if (q_lock) {
            if ((q_val & quintptr(1u)) == quintptr(1u)) {
                q_val &= ~quintptr(1u);
                q_lock->unlock();
            }
        }
    }

00140     inline void relock()
    {
        if (q_lock) {
            if ((q_val & quintptr(1u)) == quintptr(0u)) {
                q_lock->lockForWrite();
                q_val |= quintptr(1u);
            }
        }
    }

00150     inline QReadWriteLock *readWriteLock() const
    { return reinterpret_cast<QReadWriteLock *>(q_val & ~quintptr(1u)); }

private:
    Q_DISABLE_COPY(QWriteLocker)
    union{
        QReadWriteLock *q_lock;
        quintptr q_val;
    };
};

00161 inline QWriteLocker::QWriteLocker(QReadWriteLock *areadWriteLock)
    : q_lock(areadWriteLock)
{ relock(); }

#else // QT_NO_THREAD

class Q_CORE_EXPORT QReadWriteLock
{
public:
    inline explicit QReadWriteLock() { }
    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_HEADER

#endif // QREADWRITELOCK_H

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