src/java.desktop/windows/native/libawt/windows/awt_Toolkit.cpp

@@ -319,10 +319,11 @@
 
     // initialize kb state array
     ::GetKeyboardState(m_lastKeyboardState);
 
     m_waitEvent = ::CreateEvent(NULL, FALSE, FALSE, NULL);
+    isInDoDragDropLoop = FALSE;
     eventNumber = 0;
 }
 
 AwtToolkit::~AwtToolkit() {
 /*

@@ -2661,12 +2662,19 @@
 JNIEXPORT jboolean JNICALL
 Java_sun_awt_windows_WToolkit_syncNativeQueue(JNIEnv *env, jobject self, jlong timeout)
 {
     AwtToolkit & tk = AwtToolkit::GetInstance();
     DWORD eventNumber = tk.eventNumber;
+    if (!tk.isInDoDragDropLoop) {
     tk.PostMessage(WM_SYNC_WAIT, 0, 0);
-    ::WaitForSingleObject(tk.m_waitEvent, INFINITE);
+        for(long t = 2; t < timeout &&
+               WAIT_TIMEOUT == ::WaitForSingleObject(tk.m_waitEvent, 2); t+=2) {
+            if (tk.isInDoDragDropLoop) {
+                break;
+            }
+        }
+    }
     DWORD newEventNumber = tk.eventNumber;
     return (newEventNumber - eventNumber) > 2;
 }
 
 } /* extern "C" */