fixed multi-threading issues with HighlightedListViewItem

git-svn-id: svn://svn.code.sf.net/p/processhacker/code@2512 21ef857c-d57f-4fe0-8362-d861dc6d29cd

1.x/trunk/CHANGELOG.txt

@@ -8,6 +8,7 @@ Process Hacker
    * #2920711 - "Value was either too large or too small for an Int32."
    * #2920734 - "Found a reproducible bug : Value does not fall within..."
    * Missing service descriptions in dumps
+   * Multi-threading issues with highlighting
 
 1.9
  * NEW/IMPROVED:

1.x/trunk/ProcessHacker/UI/HighlightedListViewItem.cs

@@ -95,8 +95,11 @@ namespace ProcessHacker.UI
                 // Execute the pre-queue items.
                 _list.BeginUpdate();
 
-                while (_preQueue.Count > 0)
-                    _preQueue.Dequeue().Invoke();
+                lock (_preQueue)
+                {
+                    while (_preQueue.Count > 0)
+                        _preQueue.Dequeue().Invoke();
+                }
 
                 _list.EndUpdate();
 
@@ -111,8 +114,11 @@ namespace ProcessHacker.UI
                         {
                             _list.BeginUpdate();
 
-                            while (_queue.Count > 0)
-                                _queue.Dequeue().Invoke();
+                            lock (_queue)
+                            {
+                                while (_queue.Count > 0)
+                                    _queue.Dequeue().Invoke();
+                            }
 
                             _list.EndUpdate();
                         }));
@@ -125,12 +131,14 @@ namespace ProcessHacker.UI
 
         public void Enqueue(MethodInvoker method)
         {
-            _queue.Enqueue(method);
+            lock (_queue)
+                _queue.Enqueue(method);
         }
 
         public void EnqueuePre(MethodInvoker method)
         {
-            _preQueue.Enqueue(method);
+            lock (_preQueue)
+                _preQueue.Enqueue(method);
         }
 
         public void Dispose()