Initial copy of QtMultimediaKit.

Comes from original repo, with SHA1:
2c82d5611655e5967f5c5095af50c0991c4378b2

src/plugins/directshow/player/directshoweventloop.cpp

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+/****************************************************************************
+**
+** 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 <directshoweventloop.h>
+
+#include <QtCore/qcoreapplication.h>
+#include <QtCore/qcoreevent.h>
+
+class DirectShowPostedEvent
+{
+public:
+    DirectShowPostedEvent(QObject *receiver, QEvent *event)
+        : receiver(receiver)
+        , event(event)
+        , next(0)
+    {
+    }
+
+    ~DirectShowPostedEvent()
+    {
+        delete event;
+    }
+
+    QObject *receiver;
+    QEvent *event;
+    DirectShowPostedEvent *next;
+};
+
+DirectShowEventLoop::DirectShowEventLoop(QObject *parent)
+    : QObject(parent)
+    , m_postsHead(0)
+    , m_postsTail(0)
+    , m_eventHandle(::CreateEvent(0, 0, 0, 0))
+    , m_waitHandle(::CreateEvent(0, 0, 0, 0))
+{
+}
+
+DirectShowEventLoop::~DirectShowEventLoop()
+{
+    ::CloseHandle(m_eventHandle);
+    ::CloseHandle(m_waitHandle);
+
+    for (DirectShowPostedEvent *post = m_postsHead; post; post = m_postsHead) {
+        m_postsHead = m_postsHead->next;
+
+        delete post;
+    }
+}
+
+void DirectShowEventLoop::wait(QMutex *mutex)
+{
+    ::ResetEvent(m_waitHandle);
+
+    mutex->unlock();
+
+    HANDLE handles[] = { m_eventHandle, m_waitHandle };
+    while (::WaitForMultipleObjects(2, handles, false, INFINITE) == WAIT_OBJECT_0)
+        processEvents();
+  
+    mutex->lock();
+}
+
+void DirectShowEventLoop::wake()
+{
+    ::SetEvent(m_waitHandle);
+}
+
+void DirectShowEventLoop::postEvent(QObject *receiver, QEvent *event)
+{
+    QMutexLocker locker(&m_mutex);
+
+    DirectShowPostedEvent *post = new DirectShowPostedEvent(receiver, event);
+
+    if (m_postsTail)
+        m_postsTail->next = post;
+    else
+        m_postsHead = post;
+
+    m_postsTail = post;
+
+    QCoreApplication::postEvent(this, new QEvent(QEvent::User));
+    ::SetEvent(m_eventHandle);
+}
+
+void DirectShowEventLoop::customEvent(QEvent *event)
+{
+    if (event->type() == QEvent::User) {
+        processEvents();
+    } else {
+        QObject::customEvent(event);
+    }
+}
+
+void DirectShowEventLoop::processEvents()
+{
+    QMutexLocker locker(&m_mutex);
+
+    ::ResetEvent(m_eventHandle);
+
+    while(m_postsHead) {
+        DirectShowPostedEvent *post = m_postsHead;
+        m_postsHead = m_postsHead->next;
+
+        if (!m_postsHead)
+            m_postsTail = 0;
+
+        locker.unlock();
+        QCoreApplication::sendEvent(post->receiver, post->event);
+        delete post;
+        locker.relock();
+    }
+}