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diff --git a/ext/Log4Qt/src/helpers/appenderattachable.cpp b/ext/Log4Qt/src/helpers/appenderattachable.cpp
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+++ b/ext/Log4Qt/src/helpers/appenderattachable.cpp
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+/******************************************************************************
+ *
+ * package:     Log4Qt
+ * file:        appenderattachable.cpp
+ * created:     Dezember 2010
+ * author:      Andreas Bacher
+ *
+ *
+ * Copyright 2007 Andreas Bacher
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ ******************************************************************************/
+
+
+
+/******************************************************************************
+ * Dependencies
+ ******************************************************************************/
+
+
+#include "helpers/appenderattachable.h"
+#include "varia/listappender.h"
+#include "appender.h"
+
+#include <QtCore/QDebug>
+
+namespace Log4Qt
+{
+
+
+/**************************************************************************
+ * Declarations
+ **************************************************************************/
+
+
+
+/**************************************************************************
+ * C helper functions
+ **************************************************************************/
+
+
+
+/**************************************************************************
+ * Class implementation: Filter
+ **************************************************************************/
+AppenderAttachable::AppenderAttachable() :
+#if QT_VERSION < QT_VERSION_CHECK(4, 4, 0)
+        mAppenderGuard()
+#else
+        mAppenderGuard(QReadWriteLock::Recursive)
+#endif
+{
+}
+
+QList<Appender *> AppenderAttachable::appenders() const
+{
+    QReadLocker locker(&mAppenderGuard);
+
+    QList<Appender *> result;
+    Appender *p_appender;
+    Q_FOREACH(p_appender, mAppenders)
+        result << p_appender;
+
+    return result;
+}
+
+void AppenderAttachable::addAppender(Appender *pAppender)
+{
+    // Avoid deadlock:
+    // - Handle warnings, before write lock is aquired
+
+    // Keep objects with a 0 reference count safe
+    LogObjectPtr < Appender > p_appender = pAppender;
+
+    {
+        QReadLocker locker(&mAppenderGuard);
+
+        if (!p_appender) {
+            //logger()->warn("Adding null Appender to Logger '%1'", name());
+            return;
+        }
+
+        if (mAppenders.contains(p_appender)) {
+            //logger()->warn("Adding of duplicate appender '%2' to logger '%1'",
+                //name(), p_appender->name());
+            return;
+        }
+    }
+    {
+        QWriteLocker locker(&mAppenderGuard);
+
+        if (mAppenders.contains(p_appender))
+            return;
+        mAppenders.append(p_appender);
+    }
+}
+
+Appender *AppenderAttachable::appender(const QString &rName) const
+{
+    QReadLocker locker(&mAppenderGuard);
+
+    Appender *p_appender;
+    Q_FOREACH(p_appender, mAppenders)
+        if (p_appender->name() == rName)
+            return p_appender;
+    return 0;
+}
+
+bool AppenderAttachable::isAttached(Appender *pAppender) const
+{
+    QReadLocker locker(&mAppenderGuard);
+
+    // Keep objects with a 0 reference count safe
+    LogObjectPtr < Appender > p_appender = pAppender;
+
+    return mAppenders.contains(p_appender);
+}
+
+void AppenderAttachable::removeAllAppenders()
+{
+// Avoid deadlock:
+// - Only log warnings without having the write log aquired
+// - Hold a reference to all appenders so that the remove does not
+//   destruct the appender over the reference count while the write
+//   log is held. The appender may log messages.
+
+    //logger()->trace("Removing all appenders from logger '%1'", name());
+
+    QList < LogObjectPtr<Appender> > appenders;
+    {
+        QWriteLocker locker(&mAppenderGuard);
+        QMutableListIterator < LogObjectPtr<Appender> > i(mAppenders);
+        while (i.hasNext()) {
+            Appender *p_appender = i.next();
+            ListAppender *p_listappender = qobject_cast<ListAppender*> (p_appender);
+            if (p_listappender && p_listappender->configuratorList())
+                continue;
+            else {
+                appenders << p_appender;
+                i.remove();
+            }
+        }
+    }
+    appenders.clear();
+}
+
+    void AppenderAttachable::removeAppender(Appender *pAppender)
+    {
+    // Avoid deadlock:
+    // - Only log warnings without having the write log aquired
+    // - Hold a reference to the appender so that the remove does not
+    //   destruct the appender over the reference count while the write
+    //   log is held. The appender may log messages.
+
+    LogObjectPtr < Appender > p_appender = pAppender;
+
+    if (!p_appender) {
+        //logger()->warn("Request to remove null Appender from Logger '%1'", name());
+        return;
+    }
+    int n;
+    {
+        QWriteLocker locker(&mAppenderGuard);
+
+        n = mAppenders.removeAll(p_appender);
+    }
+    if (n == 0) {
+        //logger()->warn(
+        //      "Request to remove Appender '%2', which is not part of Logger '%1' appenders",
+        //      name(), p_appender->name());
+    return;
+    }
+}
+
+void AppenderAttachable::removeAppender(const QString &rName)
+{
+    Appender *p_appender = appender(rName);
+    if (p_appender)
+        removeAppender(p_appender);
+}
+
+
+/**************************************************************************
+ * Implementation: Operators, Helper
+ **************************************************************************/
+
+
+} // namespace Log4Qt