diff --git a/src/gui/kernel/qwindowsysteminterface.cpp b/src/gui/kernel/qwindowsysteminterface.cpp
index 3500792f4e..78bce0f0e3 100644
--- a/src/gui/kernel/qwindowsysteminterface.cpp
+++ b/src/gui/kernel/qwindowsysteminterface.cpp
@@ -901,26 +901,23 @@ Q_GUI_EXPORT QDebug operator<<(QDebug dbg, const QWindowSystemInterface::TouchPo
 }
 #endif
 
+// The following functions are used by testlib, and need to be synchronous to avoid
+// race conditions with plugins delivering native events from secondary threads.
+
 Q_GUI_EXPORT void qt_handleMouseEvent(QWindow *w, const QPointF &local, const QPointF &global, Qt::MouseButtons b, Qt::KeyboardModifiers mods, int timestamp)
 {
-    QWindowSystemInterfacePrivate::MouseEvent e(w, timestamp, local, global, b, mods, Qt::MouseEventNotSynthesized);
-    QGuiApplicationPrivate::processWindowSystemEvent(&e);
+    bool wasSynchronous = QWindowSystemInterfacePrivate::synchronousWindowSystemEvents;
+    QWindowSystemInterface::setSynchronousWindowSystemEvents(true);
+    QWindowSystemInterface::handleMouseEvent(w, timestamp, local, global, b, mods);
+    QWindowSystemInterface::setSynchronousWindowSystemEvents(wasSynchronous);
 }
 
 Q_GUI_EXPORT void qt_handleKeyEvent(QWindow *w, QEvent::Type t, int k, Qt::KeyboardModifiers mods, const QString & text = QString(), bool autorep = false, ushort count = 1)
 {
-    unsigned long timestamp = QWindowSystemInterfacePrivate::eventTime.elapsed();
-
-    // This is special handling needed for OS X which eventually will call sendEvent(), on other platforms
-    // this might not be safe, e.g., on Android. See: QGuiApplicationPrivate::processKeyEvent() for
-    // shortcut overriding on other platforms.
-#if defined(Q_OS_OSX)
-    if (t == QEvent::KeyPress && QWindowSystemInterface::tryHandleShortcutEvent(w, timestamp, k, mods, text))
-        return;
-#endif // Q_OS_OSX
-
-    QWindowSystemInterfacePrivate::KeyEvent e(w, timestamp, t, k, mods, text, autorep, count);
-    QGuiApplicationPrivate::processWindowSystemEvent(&e);
+    bool wasSynchronous = QWindowSystemInterfacePrivate::synchronousWindowSystemEvents;
+    QWindowSystemInterface::setSynchronousWindowSystemEvents(true);
+    QWindowSystemInterface::handleKeyEvent(w, t, k, mods, text, autorep, count);
+    QWindowSystemInterface::setSynchronousWindowSystemEvents(wasSynchronous);
 }
 
 Q_GUI_EXPORT bool qt_sendShortcutOverrideEvent(QObject *o, ulong timestamp, int k, Qt::KeyboardModifiers mods, const QString &text = QString(), bool autorep = false, ushort count = 1)
@@ -928,37 +925,37 @@ Q_GUI_EXPORT bool qt_sendShortcutOverrideEvent(QObject *o, ulong timestamp, int
     return QWindowSystemInterface::tryHandleShortcutEventToObject(o, timestamp, k, mods, text, autorep, count);
 }
 
+static QWindowSystemInterface::TouchPoint touchPoint(const QTouchEvent::TouchPoint& pt)
+{
+    QWindowSystemInterface::TouchPoint p;
+    p.id = pt.id();
+    p.flags = pt.flags();
+    p.normalPosition = pt.normalizedPos();
+    p.area = pt.screenRect();
+    p.pressure = pt.pressure();
+    p.state = pt.state();
+    p.velocity = pt.velocity();
+    p.rawPositions = pt.rawScreenPositions();
+    return p;
+}
+static QList<struct QWindowSystemInterface::TouchPoint> touchPointList(const QList<QTouchEvent::TouchPoint>& pointList)
+{
+    QList<struct QWindowSystemInterface::TouchPoint> newList;
+
+    Q_FOREACH (QTouchEvent::TouchPoint p, pointList)
+        newList.append(touchPoint(p));
+
+    return newList;
+}
+
 Q_GUI_EXPORT void qt_handleTouchEvent(QWindow *w, QTouchDevice *device,
                                 const QList<QTouchEvent::TouchPoint> &points,
                                 Qt::KeyboardModifiers mods = Qt::NoModifier)
 {
-    unsigned long timestamp = QWindowSystemInterfacePrivate::eventTime.elapsed();
-
-    if (!points.size()) // Touch events must have at least one point
-        return;
-
-    if (!QTouchDevicePrivate::isRegistered(device)) // Disallow passing bogus, non-registered devices.
-        return;
-
-    QEvent::Type type;
-    Qt::TouchPointStates states;
-
-    QList<QTouchEvent::TouchPoint>::const_iterator point = points.constBegin();
-    QList<QTouchEvent::TouchPoint>::const_iterator end = points.constEnd();
-    while (point != end) {
-        states |= point->state();
-        ++point;
-    }
-
-    // Determine the event type based on the combined point states.
-    type = QEvent::TouchUpdate;
-    if (states == Qt::TouchPointPressed)
-        type = QEvent::TouchBegin;
-    else if (states == Qt::TouchPointReleased)
-        type = QEvent::TouchEnd;
-
-    QWindowSystemInterfacePrivate::TouchEvent e(w, timestamp, type, device, points, mods);
-    QGuiApplicationPrivate::processWindowSystemEvent(&e);
+    bool wasSynchronous = QWindowSystemInterfacePrivate::synchronousWindowSystemEvents;
+    QWindowSystemInterface::setSynchronousWindowSystemEvents(true);
+    QWindowSystemInterface::handleTouchEvent(w, device, touchPointList(points), mods);
+    QWindowSystemInterface::setSynchronousWindowSystemEvents(wasSynchronous);
 }
 
 QWindowSystemEventHandler::~QWindowSystemEventHandler()