1 files changed, 10 insertions, 6 deletions
diff --git a/src/gui/kernel/qwindowsysteminterface.cpp b/src/gui/kernel/qwindowsysteminterface.cpp
index 40a298226a..5f61853a6d 100644
--- a/src/gui/kernel/qwindowsysteminterface.cpp
+++ b/src/gui/kernel/qwindowsysteminterface.cpp
@@ -340,13 +340,11 @@ QT_DEFINE_QPA_EVENT_HANDLER(void, handleExposeEvent, QWindow *window, const QReg
     QWindowSystemInterfacePrivate::handleWindowSystemEvent<Delivery>(e);
 }
 
-QT_DEFINE_QPA_EVENT_HANDLER(void, handleCloseEvent, QWindow *window, bool *accepted)
+QT_DEFINE_QPA_EVENT_HANDLER(bool, handleCloseEvent, QWindow *window)
 {
-    if (window) {
-        QWindowSystemInterfacePrivate::CloseEvent *e =
-                new QWindowSystemInterfacePrivate::CloseEvent(window, accepted);
-        QWindowSystemInterfacePrivate::handleWindowSystemEvent<Delivery>(e);
-    }
+    Q_ASSERT(window);
+    auto *event = new QWindowSystemInterfacePrivate::CloseEvent(window);
+    return QWindowSystemInterfacePrivate::handleWindowSystemEvent<Delivery>(event);
 }
 
 /*!
@@ -619,6 +617,7 @@ bool QWindowSystemInterface::isTouchDeviceRegistered(const QTouchDevice *device)
 static int g_nextPointId = 1;
 
 // map from device-independent point id (arbitrary) to "Qt point" ids
+QMutex QWindowSystemInterfacePrivate::pointIdMapMutex;
 typedef QMap<quint64, int> PointIdMap;
 Q_GLOBAL_STATIC(PointIdMap, g_pointIdMap)
 
@@ -636,6 +635,8 @@ Q_GLOBAL_STATIC(PointIdMap, g_pointIdMap)
 */
 static int acquireCombinedPointId(quint8 deviceId, int pointId)
 {
+    QMutexLocker locker(&QWindowSystemInterfacePrivate::pointIdMapMutex);
+
     quint64 combinedId64 = (quint64(deviceId) << 32) + pointId;
     auto it = g_pointIdMap->constFind(combinedId64);
     int uid;
@@ -695,6 +696,8 @@ QList<QTouchEvent::TouchPoint>
     }
 
     if (states == Qt::TouchPointReleased) {
+        QMutexLocker locker(&QWindowSystemInterfacePrivate::pointIdMapMutex);
+
         // All points on deviceId have been released.
         // Remove all points associated with that device from g_pointIdMap.
         // (On other devices, some touchpoints might still be pressed.
@@ -714,6 +717,7 @@ QList<QTouchEvent::TouchPoint>
 
 void QWindowSystemInterfacePrivate::clearPointIdMap()
 {
+    QMutexLocker locker(&QWindowSystemInterfacePrivate::pointIdMapMutex);
     g_pointIdMap->clear();
     g_nextPointId = 1;
 }