Bug 690656 - Don't Init XAtom and XEvents listener in non-main thread r=dougt

widget/src/qt/nsWindow.cpp

@@ -131,8 +131,9 @@ using namespace QtMobility;
 #include "keysym2ucs.h"
 #if MOZ_PLATFORM_MAEMO == 6
 #include <X11/Xatom.h>
-static Atom sPluginIMEAtom;
+static Atom sPluginIMEAtom = nsnull;
 #define PLUGIN_VKB_REQUEST_PROP "_NPAPI_PLUGIN_REQUEST_VKB"
+#include <QThread>
 #endif
 #endif //MOZ_X11
 
@@ -258,7 +259,10 @@ nsWindow::nsWindow()
         gGlobalsInitialized = PR_TRUE;
 
 #if defined(MOZ_X11) && (MOZ_PLATFORM_MAEMO == 6)
-        sPluginIMEAtom = XInternAtom(QX11Info::display(), PLUGIN_VKB_REQUEST_PROP, False);
+        // This cannot be called on non-main thread
+        if (QThread::currentThread() == qApp->thread()) {
+            sPluginIMEAtom = XInternAtom(QX11Info::display(), PLUGIN_VKB_REQUEST_PROP, False);
+        }
 #endif
         // It's OK if either of these fail, but it may not be one day.
         initialize_prefs();
@@ -3236,19 +3240,21 @@ nsWindow::SetInputMode(const IMEContext& aContext)
     mIMEContext = aContext;
 
 #if defined(MOZ_X11) && (MOZ_PLATFORM_MAEMO == 6)
-    static QCoreApplication::EventFilter currentEventFilter = NULL;
-    if (mIMEContext.mStatus == nsIWidget::IME_STATUS_PLUGIN && currentEventFilter != x11EventFilter) {
-        // Install event filter for listening Plugin IME state changes
-        previousEventFilter = QCoreApplication::instance()->setEventFilter(x11EventFilter);
-        currentEventFilter = x11EventFilter;
-    } else if (mIMEContext.mStatus != nsIWidget::IME_STATUS_PLUGIN && currentEventFilter == x11EventFilter) {
-        // Remove event filter
-        QCoreApplication::instance()->setEventFilter(previousEventFilter);
-        currentEventFilter = previousEventFilter;
-        previousEventFilter = NULL;
-        QWidget* view = GetViewWidget();
-        if (view) {
-            SetVKBState(view->winId(), VKBUndefined);
+    if (sPluginIMEAtom) {
+        static QCoreApplication::EventFilter currentEventFilter = NULL;
+        if (mIMEContext.mStatus == nsIWidget::IME_STATUS_PLUGIN && currentEventFilter != x11EventFilter) {
+            // Install event filter for listening Plugin IME state changes
+            previousEventFilter = QCoreApplication::instance()->setEventFilter(x11EventFilter);
+            currentEventFilter = x11EventFilter;
+        } else if (mIMEContext.mStatus != nsIWidget::IME_STATUS_PLUGIN && currentEventFilter == x11EventFilter) {
+            // Remove event filter
+            QCoreApplication::instance()->setEventFilter(previousEventFilter);
+            currentEventFilter = previousEventFilter;
+            previousEventFilter = NULL;
+            QWidget* view = GetViewWidget();
+            if (view) {
+                SetVKBState(view->winId(), VKBUndefined);
+            }
         }
     }
 #endif
@@ -3291,7 +3297,7 @@ nsWindow::SetSoftwareKeyboardState(bool aOpen)
         }
 #if defined(MOZ_X11) && (MOZ_PLATFORM_MAEMO == 6)
         // doen't open VKB if plugin did set closed state
-        else {
+        else if (sPluginIMEAtom) {
             QWidget* view = GetViewWidget();
             if (view && GetPluginVKBState(view->winId()) == VKBClose) {
                 return;