--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/auto/qsharedmemory/src/qsystemlock_win.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,182 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 "qsystemlock.h"
+#include "qsystemlock_p.h"
+#include <qdebug.h>
+#include <QtCore>
+QSystemLockPrivate::QSystemLockPrivate() :
+        semaphore(0), semaphoreLock(0),
+	lockCount(0), error(QSystemLock::NoError)
+{
+}
+
+void QSystemLockPrivate::setErrorString(const QString &function)
+{
+    BOOL windowsError = GetLastError();
+    if (windowsError == 0)
+        return;
+    errorString = function + QLatin1String(": ")
+                    + QLatin1String("Unknown error");
+    error = QSystemLock::UnknownError;
+    qWarning() << errorString << "key" << key << (int)windowsError << semaphore << semaphoreLock;
+}
+
+/*!
+    \internal
+
+    Setup the semaphore
+ */
+HANDLE QSystemLockPrivate::handle()
+{
+    // don't allow making handles on empty keys
+    if (key.isEmpty())
+        return 0;
+
+    // Create it if it doesn't already exists.
+    if (semaphore == 0) {
+        QString safeName = makeKeyFileName();
+        semaphore = CreateSemaphore(0, MAX_LOCKS, MAX_LOCKS, (wchar_t*)safeName.utf16());
+
+        if (semaphore == 0) {
+            setErrorString(QLatin1String("QSystemLockPrivate::handle"));
+            return 0;
+        }
+    }
+
+    if (semaphoreLock == 0) {
+        QString safeLockName = QSharedMemoryPrivate::makePlatformSafeKey(key + QLatin1String("lock"), QLatin1String("qipc_systemlock_"));
+        semaphoreLock = CreateSemaphore(0, 1, 1, (wchar_t*)safeLockName.utf16());
+
+        if (semaphoreLock == 0) {
+            setErrorString(QLatin1String("QSystemLockPrivate::handle"));
+            return 0;
+        }
+    }
+
+    return semaphore;
+}
+
+/*!
+    \internal
+
+    Cleanup the semaphore
+ */
+void QSystemLockPrivate::cleanHandle()
+{
+    if (semaphore && !CloseHandle(semaphore))
+        setErrorString(QLatin1String("QSystemLockPrivate::cleanHandle:"));
+    if (semaphoreLock && !CloseHandle(semaphoreLock))
+        setErrorString(QLatin1String("QSystemLockPrivate::cleanHandle:"));
+    semaphore = 0;
+    semaphoreLock = 0;
+}
+
+bool QSystemLockPrivate::lock(HANDLE handle, int count)
+{
+    if (count == 1) {
+	WaitForSingleObject(handle, INFINITE);
+	return true;
+    }
+
+    int i = count;
+    while (i > 0) {
+	if (WAIT_OBJECT_0 == WaitForSingleObject(handle, 0)) {
+	    --i;
+	} else {
+	    // undo what we have done, sleep and then try again later
+	    ReleaseSemaphore(handle, (count - i), 0);
+	    i = count;
+	    ReleaseSemaphore(semaphoreLock, 1, 0);
+	    Sleep(1);
+	    WaitForSingleObject(semaphoreLock, INFINITE);
+	}
+    }
+    return true;
+}
+
+bool QSystemLockPrivate::unlock(HANDLE handle, int count)
+{
+    if (0 == ReleaseSemaphore(handle, count, 0)) {
+        setErrorString(QLatin1String("QSystemLockPrivate::unlock"));
+        return false;
+    }
+    return true;
+}
+
+/*!
+    \internal
+
+    modifySemaphore handles recursive behavior and modifies the semaphore.
+ */
+bool QSystemLockPrivate::modifySemaphore(QSystemLockPrivate::Operation op,
+        QSystemLock::LockMode mode)
+{
+    if (0 == handle())
+        return false;
+
+    if ((lockCount == 0 && op == Lock) || (lockCount > 0 && op == Unlock)) {
+        if (op == Unlock) {
+            --lockCount;
+            Q_ASSERT(lockCount >= 0);
+            if (lockCount > 0)
+                return true;
+        }
+
+        int count = (mode == QSystemLock::ReadWrite) ? MAX_LOCKS : 1;
+        if (op == Lock) {
+            lock(semaphoreLock, 1);
+            lock(semaphore, count);
+            if (count != MAX_LOCKS) unlock(semaphoreLock, 1);
+	    lockedMode = mode;
+        } else {
+            if (count == MAX_LOCKS) unlock(semaphoreLock, 1);
+	    unlock(semaphore, count);
+        }
+
+    }
+    if (op == Lock)
+        lockCount++;
+
+    return true;
+}
+