Thread safe queue for VLC Event Handling

Change-Id: I0e9b30639667a807cc316c89356803d99fa83ef8

avmedia/source/vlc/wrapper/ThreadsafeQueue.cxx

+#include "ThreadsafeQueue.hxx"
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avmedia/source/vlc/wrapper/ThreadsafeQueue.hxx

+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you 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 .
+ */
+#ifndef _THREADSAFE_QUEUE_HXX
+#define _THREADSAFE_QUEUE_HXX
+#include <queue>
+#include <iostream>
+#include <osl/mutex.hxx>
+#include <osl/conditn.hxx>
+#include <boost/noncopyable.hpp>
+
+namespace avmedia {
+namespace vlc {
+
+template<class T>
+class ThreadsafeQueue : boost::noncopyable
+{
+public:
+    ThreadsafeQueue();
+
+    void push( const T& data );
+    void pop( T& data );
+
+private:
+    std::queue< T > mQueue;
+    mutable ::osl::Mutex mMutex;
+    ::osl::Condition mCondition;
+};
+
+template<class T>
+ThreadsafeQueue<T>::ThreadsafeQueue()
+{
+}
+
+template<class T>
+void ThreadsafeQueue<T>::push( const T& data )
+{
+    ::osl::MutexGuard guard( mMutex );
+    mQueue.push( data );
+    mCondition.set();
+}
+
+template<class T>
+void ThreadsafeQueue<T>::pop( T& data )
+{
+    mMutex.acquire();
+    if ( mQueue.empty() )
+    {
+        mMutex.release();
+        mCondition.wait();
+        mCondition.reset();
+    }
+
+    ::osl::MutexGuard guard( mMutex );
+
+    data = mQueue.front();
+    mQueue.pop();
+}
+
+}
+}
+
+#endif // _THREADSAFE_QUEUE_HXX
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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