Name: mf23781 Date: 11/25/97


Here is a major deadlock situation in AWT/Lightweights. This problem occurs on
JDK 1.1.4 and JDK 1.1.5.
If you look below, you see that we create a modal dialog in our main thread
(12) and then when a JButton is hit, we create a second modal dialog within the
AWT-EventQueue-0 thread (5). On the AWT-Dispatch-Proxy thread (10), a
setCursor is being performed (not by us but by the system) which is causing a
deadlock between threads 5 and 10.
If I make the dialog in thread 5 non-modal, the deadlock goes away, but this is
not a viable solution for us.

Group system:
 1. (java.lang.Thread)0xf600d0 Finalizer thread cond. waitin
 2. (java.lang.Thread)0xf655b0 Debugger agent running
 3. (sun.tools.debug.BreakpointHandler)0xf78ff0 Breakpoint handler cond. waitin
 4. (sun.tools.debug.StepHandler)0xf79078 Step handler cond. waitin
 5. (java.awt.EventDispatchThread)0xf7f1f8 AWT-EventQueue-0 running
 6. (java.lang.Thread)0xf7f2a8 AWT-Windows running
 7. (java.lang.Thread)0xf7f358 TimerQueue running
 8. (sun.awt.ScreenUpdater)0xf7b1d8 Screen Updater running
 9. (sun.awt.AWTFinalizer)0xf7b298 AWT-Finalizer running
10. (java.awt.EventDispatchThread)0xf85db0 AWT-Dispatch-Proxy running
Group main:
11. (java.lang.Thread)0xf600a8 main running
Group lotus.sametime.apps.blimp.BLIMp.main:
12. (sun.tools.debug.MainThread)0xf7d0d0 main running
Group BLIMp:
Group PacketThreadManager:
13. (lotus.sametime.protocol.net.PacketParserThread)0xf8ab38 PacketParserThread
Group SocketManager:
14. (lotus.sametime.protocol.net.SocketManager$SelectThread)0xf8acb8 SelectThre
Group BLIMp:
Group PacketThreadManager:
13. (lotus.sametime.protocol.net.PacketParserThread)0xf8ab38 PacketParserThread
Group SocketManager:
14. (lotus.sametime.protocol.net.SocketManager$SelectThread)0xf8acb8 SelectThre

main 1Ù where 5
   1Ù sun.awt.windows.WDialogPeer.show (WDialogPeer:55)
   2Ù java.awt.Dialog.show (Dialog:220)
   3Ù java.awt.Component.show (Component:498)
   4Ù java.awt.Component.setVisible (Component:460)
   5Ù lotus.sametime.apps.blimp.LoginDialog.actionPerformed (LoginDialog:482)
   6Ù com.sun.java.swing.AbstractButton.fireActionPerformed (AbstractButton:759)
   7Ù com.sun.java.swing.AbstractButton$ForwardActionEvents.actionPerformed
(AbstractButton$ForwardActionEvents:794)
   8Ù com.sun.java.swing.DefaultButtonModel.fireActionPerformed
(DefaultButtonModel:314)
   9Ù com.sun.java.swing.DefaultButtonModel.setPressed (DefaultButtonModel:212)
   10Ù com.sun.java.swing.basic.BasicButtonListener.mouseReleased
(BasicButtonListener:135)
   11Ù java.awt.Component.processMouseEvent (Component:2284)
   12Ù java.awt.Component.processEvent (Component:2129)
   13Ù java.awt.Container.processEvent (Container:890)
   14Ù java.awt.Component.dispatchEventImpl (Component:1764)
   15Ù java.awt.Container.dispatchEventImpl (Container:935)
   16Ù java.awt.Component.dispatchEvent (Component:1704)
   17Ù java.awt.LightweightDispatcher.retargetMouseEvent
(LightweightDispatcher:1539)
   18Ù java.awt.LightweightDispatcher.processMouseEvent
(LightweightDispatcher:1448)
   19Ù java.awt.LightweightDispatcher.dispatchEvent (LightweightDispatcher:1383)
   20Ù java.awt.Container.dispatchEventImpl (Container:922)
   21Ù java.awt.Window.dispatchEventImpl (Window:443)
   22Ù java.awt.Component.dispatchEvent (Component:1704)
   23Ù java.awt.EventDispatchThread.run (EventDispatchThread:63)

main 1Ù where 10
   1Ù java.awt.Component.setCursor (Component:1193)
   2Ù java.awt.LightweightDispatcher.setMouseTarget (LightweightDispatcher:1508)
   3Ù java.awt.LightweightDispatcher.processMouseEvent
(LightweightDispatcher:1464)
   4Ù java.awt.LightweightDispatcher.dispatchEvent (LightweightDispatcher:1383)
   5Ù java.awt.Container.dispatchEventImpl (Container:922)
   6Ù java.awt.Window.dispatchEventImpl (Window:443)
   7Ù java.awt.Component.dispatchEvent (Component:1704)
   8Ù java.awt.EventDispatchThread.run (EventDispatchThread:63)

main 1Ù where 12
   1Ù sun.awt.windows.WDialogPeer.show (WDialogPeer:55)
   2Ù java.awt.Dialog.show (Dialog:220)
   3Ù java.awt.Component.show (Component:498)
   4Ù java.awt.Component.setVisible (Component:460)
   5Ù lotus.sametime.apps.blimp.BLIMp.login (BLIMp:438)
   6Ù lotus.sametime.apps.blimp.BLIMp.main (BLIMp:1095)
   7Ù sun.tools.debug.MainThread.run (MainThread:55)

- Michael

======================================================================

  I wish I had a small test case. Both problems (4095123 & 4095124) occur
  with the same code, which is not large itself but requires JNDI, LDAP,
  and SWING.

  I tried to reduce the problem down but the problem just doesn't
  occur. I am not sure if its timing related or what. These problems
  have occurred on Win32 (NT and 95). I haven't tested any other
  platform.