ensure initialized state is visible to other threads

platform/lang-impl/src/com/intellij/util/indexing/FileBasedIndexImpl.java

@@ -125,7 +125,7 @@ public class FileBasedIndexImpl extends FileBasedIndex {
   @Nullable private ScheduledFuture<?> myFlushingFuture;
   private volatile int myLocalModCount;
   private volatile int myFilesModCount;
-
+  private volatile boolean myInitialized; // need this variable for memory barrier
   @Override
   public void requestReindex(@NotNull final VirtualFile file) {
     myChangedFilesCollector.invalidateIndices(file, true);
@@ -347,7 +347,7 @@ public class FileBasedIndexImpl extends FileBasedIndex {
           lastModCount = myLocalModCount;
         }
       });
-
+      myInitialized = true; // this will ensure that all changes to component's state will be visible to other threads
     }
   }