Name: jl125535 Date: 03/03/2003
FULL PRODUCT VERSION :
java version "1.4.1_02"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1_02-b06)
Java HotSpot(TM) Client VM (build 1.4.1_02-b06, mixed mode)
FULL OS VERSION :
Microsoft Windows XP [Version 5.1.2600]
EXTRA RELEVANT SYSTEM CONFIGURATION :
Pentium 4 2.4Ghz, 512MB, Geforce4 Ti 4600 (tested on Nvidia drivers 40.72 and 41.09)
A DESCRIPTION OF THE PROBLEM :
(Regression from 1.4.1_01)
Calling window.createBufferStrategy() often deadlocks (about half the time on my machine.)
This did not occur in 1.4.0, 1.4.1 or 1.4.1_01
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run sample code at:
http://java.sun.com/docs/books/tutorial/extra/fullscreen/example-1dot4/MultiBufferTest.java
It may take several runs for deadlock to occur.
EXPECTED VERSUS ACTUAL BEHAVIOR :
deadlock should not occur.
(See error message)
locks occurs between main and AWT-EventQueue-0 threads on two objects:
a sun.awt.windows.WFramePeer
a java.awt.Component$AWTTreeLock
the main thread obtains locks in this order: WFramePeer, AWTTreeLock.
the awt thread obtains locks in this order: AWTTreeLock, WFramePeer.
thus, deadlock occurs.
ERROR MESSAGES/STACK TRACES THAT OCCUR :
Full thread dump Java HotSpot(TM) Client VM (1.4.1_02-b06 mixed mode):
"AWT-EventQueue-0" prio=7 tid=0x0AC9D450 nid=0x720 waiting for monitor entry [130df000..130dfd8c]
at sun.awt.windows.WComponentPeer.replaceSurfaceData(WComponentPeer.java:316)
- waiting to lock <02AE0350> (a sun.awt.windows.WFramePeer)
- locked <02AE07B0> (a java.awt.Component$AWTTreeLock)
at sun.awt.windows.WComponentPeer.displayChanged(WComponentPeer.java:351)
at sun.awt.windows.WCanvasPeer.displayChanged(WCanvasPeer.java:42)
at sun.awt.windows.WPanelPeer.displayChanged(WPanelPeer.java:118)
at sun.awt.windows.WWindowPeer.displayChanged(WWindowPeer.java:185)
at sun.awt.SunDisplayChanger.notifyListeners(SunDisplayChanger.java:102)
at sun.awt.Win32GraphicsDevice.displayChanged(Win32GraphicsDevice.java:377)
at sun.awt.Win32GraphicsEnvironment.displayChanged(Win32GraphicsEnvironment.java:92)
at sun.awt.windows.WToolkit$4.run(WToolkit.java:723)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:448)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)
"Java2D Disposer" daemon prio=10 tid=0x0AC99C50 nid=0x47c in Object.wait() [1308f000..1308fd8c]
at java.lang.Object.wait(Native Method)
- waiting on <02AE03F8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:111)
- locked <02AE03F8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
at sun.java2d.Disposer.run(Disposer.java:97)
at java.lang.Thread.run(Thread.java:536)
"AWT-Windows" daemon prio=7 tid=0x0AC96050 nid=0x6c0 runnable [1300f000..1300fd8c]
at sun.awt.windows.WToolkit.eventLoop(Native Method)
at sun.awt.windows.WToolkit.run(WToolkit.java:253)
at java.lang.Thread.run(Thread.java:536)
"AWT-Shutdown" prio=5 tid=0x0AC943C8 nid=0x414 in Object.wait() [12fcf000..12fcfd8c]
at java.lang.Object.wait(Native Method)
- waiting on <02AE04C8> (a java.lang.Object)
at java.lang.Object.wait(Object.java:426)
at sun.awt.AWTAutoShutdown.run(AWTAutoShutdown.java:259)
- locked <02AE04C8> (a java.lang.Object)
at java.lang.Thread.run(Thread.java:536)
"Signal Dispatcher" daemon prio=10 tid=0x009A8DE8 nid=0x350 waiting on condition [0..0]
"Finalizer" daemon prio=9 tid=0x009A5378 nid=0x590 in Object.wait() [ab1f000..ab1fd8c]
at java.lang.Object.wait(Native Method)
- waiting on <02F6C358> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:111)
- locked <02F6C358> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
"Reference Handler" daemon prio=10 tid=0x009A3FF8 nid=0x168 in Object.wait() [aadf000..aadfd8c]
at java.lang.Object.wait(Native Method)
- waiting on <02F6C3C0> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:426)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:113)
- locked <02F6C3C0> (a java.lang.ref.Reference$Lock)
"main" prio=5 tid=0x00034648 nid=0x538 waiting for monitor entry [7f000..7fc40]
at sun.awt.windows.WComponentPeer.replaceSurfaceData(WComponentPeer.java:315)
- waiting to lock <02AE07B0> (a java.awt.Component$AWTTreeLock)
at sun.awt.windows.WComponentPeer.createBuffers(WComponentPeer.java:698)
- locked <02AE0350> (a sun.awt.windows.WFramePeer)
at java.awt.Component$FlipBufferStrategy.createBuffers(Component.java:3048)
at java.awt.Component$FlipBufferStrategy.<init>(Component.java:3017)
at java.awt.Component.createBufferStrategy(Component.java:2926)
at java.awt.Window.createBufferStrategy(Window.java:2046)
at java.awt.Component.createBufferStrategy(Component.java:2858)
at java.awt.Window.createBufferStrategy(Window.java:2021)
at MultiBufferTest.<init>(MultiBufferTest.java:42)
at MultiBufferTest.main(MultiBufferTest.java:102)
"VM Thread" prio=5 tid=0x009ECC98 nid=0x20c runnable
"VM Periodic Task Thread" prio=10 tid=0x009A77A0 nid=0x4fc waiting on condition
"Suspend Checker Thread" prio=10 tid=0x009A8428 nid=0x6b4 runnable
Found one Java-level deadlock:
=============================
"AWT-EventQueue-0":
waiting to lock monitor 0x9a4aa4 (object 0x2ae0350, a sun.awt.windows.WFramePeer),
which is held by "main"
"main":
waiting to lock monitor 0x9a4a44 (object 0x2ae07b0, a java.awt.Component$AWTTreeLock),
which is held by "AWT-EventQueue-0"
Java stack information for the threads listed above:
===================================================
"AWT-EventQueue-0":
at sun.awt.windows.WComponentPeer.replaceSurfaceData(WComponentPeer.java:316)
- waiting to lock <02AE0350> (a sun.awt.windows.WFramePeer)
- locked <02AE07B0> (a java.awt.Component$AWTTreeLock)
at sun.awt.windows.WComponentPeer.displayChanged(WComponentPeer.java:351)
at sun.awt.windows.WCanvasPeer.displayChanged(WCanvasPeer.java:42)
at sun.awt.windows.WPanelPeer.displayChanged(WPanelPeer.java:118)
at sun.awt.windows.WWindowPeer.displayChanged(WWindowPeer.java:185)
at sun.awt.SunDisplayChanger.notifyListeners(SunDisplayChanger.java:102)
at sun.awt.Win32GraphicsDevice.displayChanged(Win32GraphicsDevice.java:377)
at sun.awt.Win32GraphicsEnvironment.displayChanged(Win32GraphicsEnvironment.java:92)
at sun.awt.windows.WToolkit$4.run(WToolkit.java:723)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:448)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)
"main":
at sun.awt.windows.WComponentPeer.replaceSurfaceData(WComponentPeer.java:315)
- waiting to lock <02AE07B0> (a java.awt.Component$AWTTreeLock)
at sun.awt.windows.WComponentPeer.createBuffers(WComponentPeer.java:698)
- locked <02AE0350> (a sun.awt.windows.WFramePeer)
at java.awt.Component$FlipBufferStrategy.createBuffers(Component.java:3048)
at java.awt.Component$FlipBufferStrategy.<init>(Component.java:3017)
at java.awt.Component.createBufferStrategy(Component.java:2926)
at java.awt.Window.createBufferStrategy(Window.java:2046)
at java.awt.Component.createBufferStrategy(Component.java:2858)
at java.awt.Window.createBufferStrategy(Window.java:2021)
at MultiBufferTest.<init>(MultiBufferTest.java:42)
at MultiBufferTest.main(MultiBufferTest.java:102)
Found 1 deadlock.
REPRODUCIBILITY :
This bug can be reproduced often.
---------- BEGIN SOURCE ----------
/*
http://java.sun.com/docs/books/tutorial/extra/fullscreen/example-1dot4/MultiBufferTest.java
*/
/**
* This test takes a number up to 13 as an argument (assumes 2 by
* default) and creates a multiple buffer strategy with the number of
* buffers given. This application enters full-screen mode, if available,
* and flips back and forth between each buffer (each signified by a different
* color).
*/
import java.awt.*;
import java.awt.image.BufferStrategy;
public class MultiBufferTest {
private static Color[] COLORS = new Color[] {
Color.red, Color.blue, Color.green, Color.white, Color.black,
Color.yellow, Color.gray, Color.cyan, Color.pink, Color.lightGray,
Color.magenta, Color.orange, Color.darkGray };
private static DisplayMode[] BEST_DISPLAY_MODES = new DisplayMode[] {
new DisplayMode(640, 480, 32, 0),
new DisplayMode(640, 480, 16, 0),
new DisplayMode(640, 480, 8, 0)
};
Frame mainFrame;
public MultiBufferTest(int numBuffers, GraphicsDevice device) {
try {
GraphicsConfiguration gc = device.getDefaultConfiguration();
mainFrame = new Frame(gc);
mainFrame.setUndecorated(true);
mainFrame.setIgnoreRepaint(true);
device.setFullScreenWindow(mainFrame);
if (device.isDisplayChangeSupported()) {
chooseBestDisplayMode(device);
}
Rectangle bounds = mainFrame.getBounds();
mainFrame.createBufferStrategy(numBuffers);
BufferStrategy bufferStrategy = mainFrame.getBufferStrategy();
for (float lag = 2000.0f; lag > 0.00000006f; lag = lag / 1.33f) {
for (int i = 0; i < numBuffers; i++) {
Graphics g = bufferStrategy.getDrawGraphics();
if (!bufferStrategy.contentsLost()) {
g.setColor(COLORS[i]);
g.fillRect(0,0,bounds.width, bounds.height);
bufferStrategy.show();
g.dispose();
}
try {
Thread.sleep((int)lag);
} catch (InterruptedException e) {}
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
device.setFullScreenWindow(null);
}
}
private static DisplayMode getBestDisplayMode(GraphicsDevice device) {
for (int x = 0; x < BEST_DISPLAY_MODES.length; x++) {
DisplayMode[] modes = device.getDisplayModes();
for (int i = 0; i < modes.length; i++) {
if (modes[i].getWidth() == BEST_DISPLAY_MODES[x].getWidth()
&& modes[i].getHeight() == BEST_DISPLAY_MODES[x].getHeight()
&& modes[i].getBitDepth() == BEST_DISPLAY_MODES[x].getBitDepth()
) {
return BEST_DISPLAY_MODES[x];
}
}
}
return null;
}
public static void chooseBestDisplayMode(GraphicsDevice device) {
DisplayMode best = getBestDisplayMode(device);
if (best != null) {
device.setDisplayMode(best);
}
}
public static void main(String[] args) {
try {
int numBuffers = 2;
if (args != null && args.length > 0) {
numBuffers = Integer.parseInt(args[0]);
if (numBuffers < 2 || numBuffers > COLORS.length) {
System.err.println("Must specify between 2 and "
+ COLORS.length + " buffers");
System.exit(1);
}
}
GraphicsEnvironment env = GraphicsEnvironment.
getLocalGraphicsEnvironment();
GraphicsDevice device = env.getDefaultScreenDevice();
MultiBufferTest test = new MultiBufferTest(numBuffers, device);
} catch (Exception e) {
e.printStackTrace();
}
System.exit(0);
}
}
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
lock the window's tree lock during the entire fullscreen/displaymode/bufferstrategy process.
synchronized (mainFrame.getTreeLock()) {
device.setFullScreenWindow(mainFrame);
if (device.isDisplayChangeSupported()) {
chooseBestDisplayMode(device);
}
bounds = mainFrame.getBounds();
mainFrame.createBufferStrategy(numBuffers);
}
(Review ID: 181959)
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Java