diff -r 000000000000 -r 876b1a06bc25 src/publishsubscribe/qsystemreadwritelock_win.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/publishsubscribe/qsystemreadwritelock_win.cpp	Wed Aug 25 15:49:42 2010 +0300
@@ -0,0 +1,330 @@
+/****************************************************************************
+**
+** 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 Qt Mobility Components.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qsystemreadwritelock_p.h"
+
+#include <QSharedMemory>
+#include <QSystemSemaphore>
+
+///#define QSYSTEMREADWRITELOCK_DEBUG 1
+#ifdef QSYSTEMREADWRITELOCK_DEBUG
+#include <QDebug>
+#endif
+
+QT_USE_NAMESPACE
+
+QTM_BEGIN_NAMESPACE
+
+class QSystemReadWriteLockPrivate
+{
+public:
+    QSystemReadWriteLockPrivate(const QString &key, QSystemReadWriteLock::AccessMode mode);
+    ~QSystemReadWriteLockPrivate();
+
+    int &accessCount();
+    unsigned int &waitingReaders();
+    unsigned int &waitingWriters();
+
+    QSystemReadWriteLock::SystemReadWriteLockError convertError(QSystemSemaphore::SystemSemaphoreError error);
+    QSystemReadWriteLock::SystemReadWriteLockError convertError(QSharedMemory::SharedMemoryError error);
+
+    QString m_key;
+
+    QSharedMemory m_counts;
+    QSystemSemaphore m_readerWait;
+    QSystemSemaphore m_writerWait;
+    bool m_isInitialized;
+
+    QSystemReadWriteLock::SystemReadWriteLockError m_error;
+    QString m_errorString;
+};
+
+QSystemReadWriteLockPrivate::QSystemReadWriteLockPrivate(const QString &key, QSystemReadWriteLock::AccessMode mode)
+    :m_key(key), m_counts(key + QLatin1String("_counts")),
+    m_readerWait(key + QLatin1String("_readerWait"), 0, (mode==QSystemReadWriteLock::Create)?QSystemSemaphore::Create:QSystemSemaphore::Open),
+    m_writerWait(key + QLatin1String("_writerWait"), 0, (mode==QSystemReadWriteLock::Create)?QSystemSemaphore::Create:QSystemSemaphore::Open),
+    m_isInitialized(false), m_error(QSystemReadWriteLock::NoError), m_errorString(QString())
+{
+    bool isAttached = false;
+    int retries=5;
+    for (int i=0; i < retries; ++i){
+        if (m_counts.attach()) {
+            isAttached = true;
+            break;
+        }
+        else {
+            if (m_counts.error() == QSharedMemory::NotFound) {
+                if (m_counts.create(3 * sizeof(int))) {
+                    isAttached = true;
+                    break;
+                }
+            }
+        }
+    }
+
+    if (!isAttached) {
+        m_error = convertError(m_counts.error());
+        m_errorString = QObject::tr("QSystemReadWriteLockPrivate::QSystemReadWriteLockPrivate: "
+                                        "Unable to create/attach to shared memory");
+        return;
+    } else {
+        if (mode == QSystemReadWriteLock::Create) {
+            if(!m_counts.lock()) {
+                m_error = convertError(m_counts.error());
+                m_errorString = QObject::tr("QSystemReadWriteLockPrivate::QSystemReadWriteLockPrivate: "
+                                                "Unable to initialize shared memory");
+                return;
+            }
+            int * data = (int *)m_counts.data();
+            ::memset(data, 0, 3 * sizeof(int));
+            m_counts.unlock();
+        }
+        m_isInitialized = true;
+    }
+}
+
+QSystemReadWriteLockPrivate::~QSystemReadWriteLockPrivate()
+{
+}
+
+QSystemReadWriteLock::SystemReadWriteLockError QSystemReadWriteLockPrivate::convertError(QSystemSemaphore::SystemSemaphoreError error)
+{
+    switch(error) {
+        case QSystemSemaphore::NoError:
+            return QSystemReadWriteLock::NoError;
+        case QSystemSemaphore::PermissionDenied:
+            return QSystemReadWriteLock::PermissionDenied;
+        case QSystemSemaphore::KeyError:
+            return QSystemReadWriteLock::KeyError;
+        case QSystemSemaphore::NotFound:
+            return QSystemReadWriteLock::NotFound;
+        case QSystemSemaphore::OutOfResources:
+            return QSystemReadWriteLock::OutOfResources;
+        case QSystemSemaphore::AlreadyExists:
+        case QSystemSemaphore::UnknownError:
+        default:
+            return QSystemReadWriteLock::UnknownError;
+    }
+}
+
+QSystemReadWriteLock::SystemReadWriteLockError QSystemReadWriteLockPrivate::convertError(QSharedMemory::SharedMemoryError error)
+{
+    switch(error){
+        case QSharedMemory::NoError:
+            return QSystemReadWriteLock::NoError;
+        case QSharedMemory::PermissionDenied:
+            return QSystemReadWriteLock::PermissionDenied;
+        case QSharedMemory::KeyError:
+            return QSystemReadWriteLock::KeyError;
+        case QSharedMemory::NotFound:
+            return QSystemReadWriteLock::NotFound;
+        case QSharedMemory::LockError:
+            return QSystemReadWriteLock::LockError;
+        case QSharedMemory::UnknownError:
+        default:
+            return QSystemReadWriteLock::UnknownError;
+    }
+}
+
+QSystemReadWriteLock::QSystemReadWriteLock(const QString &key, AccessMode mode)
+    :d(new QSystemReadWriteLockPrivate(key,mode))
+{
+}
+
+QSystemReadWriteLock::~QSystemReadWriteLock()
+{
+    Q_ASSERT(d);
+    delete d;
+    d = 0;
+}
+
+bool QSystemReadWriteLock::lockForRead()
+{
+#if defined QSYSTEMREADWRITELOCK_DEBUG
+    qDebug() << "QSystemReadWriteLock::lockForRead() <start>\naccessCount ="
+        << d->accessCount() << "\twaitingWriters=" << d->waitingWriters() << "\twaitingReaders=" << d->waitingReaders();
+#endif
+    if (!d->m_isInitialized) {
+        d->m_error = QSystemReadWriteLock::FailedToInitialize;
+        d->m_errorString = QObject::tr("QSystemReadWriteLock::lockForRead(): cannot peform operation, lock initialization had not been successful");
+        return false;
+    }
+
+    if(!d->m_counts.lock()) {
+        d->m_error = d->convertError(d->m_counts.error());
+        d->m_errorString = QObject::tr("QSystemReadWriteLock::lockForRead(): cannot perform operation, locking of shared memory was unsuccessful");
+        return false;
+    }
+
+    while(d->accessCount() < 0 || d->waitingWriters() > 0 ) {
+        ++d->waitingReaders();
+        d->m_counts.unlock();
+        d->m_readerWait.acquire();
+        d->m_counts.lock();
+        --d->waitingReaders();
+    }
+    ++d->accessCount();
+    Q_ASSERT_X(d->accessCount() > 0, "QSystemReadWriteLock::lockForRead()", "Overflow in lock counter");
+#if defined QSYSTEMREADWRITELOCK_DEBUG
+    qDebug() << "QSystemReadWriteLock::lockForRead() <end>\naccessCount ="
+        << d->accessCount() << "\twaitingWriters=" << d->waitingWriters() << "\twaitingReaders=" << d->waitingReaders();
+#endif
+
+    d->m_error = QSystemReadWriteLock::NoError;
+    d->m_errorString.clear();
+    d->m_counts.unlock();
+    return true;
+}
+
+bool QSystemReadWriteLock::lockForWrite()
+{
+#if defined QSYSTEMREADWRITELOCK_DEBUG
+    qDebug() << "QSystemReadWriteLock::lockForWrite() <start>\naccessCount ="
+        << d->accessCount() << "\twaitingWriters=" << d->waitingWriters() << "\twaitingReaders=" << d->waitingReaders();
+#endif
+    if (!d->m_isInitialized) {
+        d->m_error = QSystemReadWriteLock::FailedToInitialize;
+        d->m_errorString = QObject::tr("QSystemReadWriteLock::lockForWrite(): cannot peform operation, lock initialization had not been successful");
+        return false;
+    }
+
+    if(!d->m_counts.lock()) {
+        d->m_error = d->convertError(d->m_counts.error());
+        d->m_errorString = QObject::tr("QSystemReadWriteLock::lockForwrite(): cannot perform operation, locking of shared memory was unsuccessful");
+        return false;
+    }
+
+#if defined QSYSTEMREADWRITELOCK_DEBUG
+    qDebug() << "QSystemReadWriteLock::lockForWrite() <start>\naccessCount =" 
+        << d->accessCount() << "\twaitingWriters=" << d->waitingWriters() << "\twaitingReaders=" << d->waitingReaders();
+#endif
+    while(d->accessCount() != 0) {
+        ++d->waitingWriters();
+        d->m_counts.unlock();
+        d->m_writerWait.acquire();
+        d->m_counts.lock();
+        --d->waitingWriters();
+    }
+    --d->accessCount();
+#if defined QSYSTEMREADWRITELOCK_DEBUG
+    qDebug() << "QSystemReadWriteLock::lockForWrite() <end>\naccessCount =" 
+        << d->accessCount() << "\twaitingWriters=" << d->waitingWriters() << "\twaitingReaders=" << d->waitingReaders();
+#endif
+
+    Q_ASSERT_X(d->accessCount() < 0, "QSystemReadWriteLock::lockForWrite()", "Overflow in lock counter");
+
+    d->m_error = QSystemReadWriteLock::NoError;
+    d->m_errorString.clear();
+    d->m_counts.unlock();
+    return true;
+}
+
+void QSystemReadWriteLock::unlock()
+{
+    if (!d->m_isInitialized) {
+        d->m_error = QSystemReadWriteLock::FailedToInitialize;
+        d->m_errorString = QObject::tr("QSystemReadWriteLock::unlock(): cannot peform operation, lock initialization had not been successful");
+        return;
+    }
+
+    if(!d->m_counts.lock()) {
+        d->m_error = d->convertError(d->m_counts.error());
+        d->m_errorString = QObject::tr("QSystemReadWriteLock::lockForwrite(): cannot perform operation, locking of shared memory was unsuccessful");
+        return;
+    }
+
+    Q_ASSERT_X(d->accessCount() != 0, "QSystemReadWriteLock::unlock()", "Cannot unlock an unlocked lock");
+
+    bool unlocked = false;
+    if (d->accessCount() > 0) {
+        unlocked = --d->accessCount() == 0;
+    } else if (d->accessCount() < 0 && ++d->accessCount() == 0) {
+        unlocked = true;
+    }
+
+    if (unlocked) {
+        if (d->waitingWriters() > 0 ) {
+            d->m_writerWait.release();
+        } else if (d->waitingReaders()) {
+            d->m_readerWait.release(d->waitingReaders());
+        }
+    }
+#if defined QSYSTEMREADWRITELOCK_DEBUG
+    qDebug() << "QSystemReadWriteLock::unlock() <end>\naccessCount =" 
+        << d->accessCount() << "\twaitingWriters=" << d->waitingWriters() << "\twaitingReaders=" << d->waitingReaders();
+#endif
+    d->m_error = QSystemReadWriteLock::NoError;
+    d->m_errorString.clear();
+    d->m_counts.unlock();
+    return;
+}
+
+int& QSystemReadWriteLockPrivate::accessCount()
+{
+    return *((int *)m_counts.data());
+}
+
+unsigned int &QSystemReadWriteLockPrivate::waitingReaders()
+{
+    return *(((unsigned int*)m_counts.data())+1);
+}
+
+unsigned int &QSystemReadWriteLockPrivate::waitingWriters()
+{
+    return *(((unsigned int*)m_counts.data())+2);
+}
+
+QSystemReadWriteLock::SystemReadWriteLockError QSystemReadWriteLock::error() const
+{
+    return d->m_error;
+}
+
+QString QSystemReadWriteLock::errorString() const
+{
+    return d->m_errorString;
+}
+
+QString QSystemReadWriteLock::key() const
+{
+    return d->m_key;
+}
+
+QTM_END_NAMESPACE