QWinOverlappedIoNotifier introduced

For asynchronous (overlapped) I/O notification on Windows one
can now use the convenience class QWinOverlappedIoNotifier.
It's using one global I/O completion port and a watching thread to
get notified when a read or write operation completes.

Change-Id: If6f904b364be0405580c7e50355529ab136ae3cb
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>

1 files changed, 101 insertions, 0 deletions

diff --git a/src/corelib/io/qwinoverlappedionotifier_p.h b/src/corelib/io/qwinoverlappedionotifier_p.h
new file mode 100644
index 0000000000..2924c21117
--- /dev/null
+++ b/src/corelib/io/qwinoverlappedionotifier_p.h
@@ -0,0 +1,101 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWINOVERLAPPEDIONOTIFIER_P_H
+#define QWINOVERLAPPEDIONOTIFIER_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <qobject.h>
+#include <qt_windows.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Core)
+
+class Q_CORE_EXPORT QWinOverlappedIoNotifier : public QObject
+{
+    Q_OBJECT
+public:
+    QWinOverlappedIoNotifier(QObject *parent = 0);
+    ~QWinOverlappedIoNotifier();
+
+    void setHandle(HANDLE h);
+    HANDLE handle() const { return hHandle; }
+
+    void setEnabled(bool enabled);
+    bool waitForNotified(int msecs);
+
+Q_SIGNALS:
+    void notified(DWORD numberOfBytes, DWORD errorCode);
+    void _q_notify();
+
+private Q_SLOTS:
+    void _q_notified();
+
+private:
+    void notify(DWORD numberOfBytes, DWORD errorCode);
+
+private:
+    HANDLE hHandle;
+    HANDLE hEvent;
+    DWORD lastNumberOfBytes;
+    DWORD lastErrorCode;
+
+    friend class QWinIoCompletionPort;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QWINOVERLAPPEDIONOTIFIER_P_H