1 files changed, 95 insertions, 0 deletions
diff --git a/qtools/qmutex.cpp b/qtools/qmutex.cpp
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+++ b/qtools/qmutex.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, 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 are unsure which license is appropriate for your use, please
+** contact the sales department at http://www.qtsoftware.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <stdio.h>
+
+#include "qglobal.h"
+
+#include "qmutex.h"
+#include "qmutex_p.h"
+
+QMutex::QMutex() : d(new QMutexPrivate())
+{
+}
+
+QMutex::~QMutex()
+{
+  delete d;
+}
+
+void QMutex::lock()
+{
+    //printf("%p: QMutex::lock(): enter\n",this);
+    bool isLocked;
+    isLocked = d->contenders.testAndSet(0, 1);
+    if (!isLocked)
+    {
+      isLocked = d->contenders.fetchAndAdd(1)==0;
+      if (!isLocked)
+      {
+        // didn't get the lock, wait for it
+        //printf("%p: QMutex::lock(): wait() %d\n",this,(int)d->contenders);
+        d->wait();
+
+        // release lock
+        d->contenders.fetchAndAdd(-1);
+      }
+    }
+    //printf("%p: QMutex::lock(): leave\n",this);
+}
+
+bool QMutex::tryLock()
+{
+    bool isLocked = d->contenders.testAndSet(0, 1);
+    return isLocked;
+}
+
+void QMutex::unlock()
+{
+    //printf("%p: QMutex::unlock(): enter %d\n",this,(int)d->contenders);
+    if (!d->contenders.testAndSet(1, 0))
+    {
+         //printf("%p: QMutex::unlock(): wakeUp()\n",this);
+         d->wakeUp();
+    }
+    //printf("%p: QMutex::unlock(): leave\n",this);
+}
+