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Workaround for Sun JDK bug 4796548 which still exists in java for OS X

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This commit is contained in:
Brian Matzon 2005-08-20 19:09:02 +00:00
parent 4e3a47e343
commit 7b57affe3c
1 changed files with 38 additions and 5 deletions
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43
src/java/org/lwjgl/opengl/AWTSurfaceLock.java
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@ -33,6 +33,9 @@ package org.lwjgl.opengl;
import java.awt.Canvas;
import java.nio.ByteBuffer;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import org.lwjgl.LWJGLException;
import org.lwjgl.LWJGLUtil;
@ -44,17 +47,21 @@ import org.lwjgl.LWJGLUtil;
* @version $Revision$
*/
final class AWTSurfaceLock {
private final static int WAIT_DELAY_MILLIS = 100;
private final ByteBuffer lock_buffer;
private final static int WAIT_DELAY_MILLIS = 100;
private final ByteBuffer lock_buffer;
private boolean firstLockSucceeded = false;
public AWTSurfaceLock() {
lock_buffer = createHandle();
}
private static native ByteBuffer createHandle();
public ByteBuffer lockAndGetHandle(Canvas canvas) throws LWJGLException {
while (!lockAndInitHandle(lock_buffer, canvas)) {
while (!privilegedLockAndInitHandle(canvas)) {
LWJGLUtil.log("Could not get drawing surface info, retrying...");
try {
Thread.sleep(WAIT_DELAY_MILLIS);
@ -62,12 +69,38 @@ final class AWTSurfaceLock {
LWJGLUtil.log("Interrupted while retrying: " + e);
}
}
return lock_buffer;
}
private boolean privilegedLockAndInitHandle(final Canvas canvas) throws LWJGLException {
// Workaround for Sun JDK bug 4796548 which still exists in java for OS X
// We need to elevate priveleges because of an AWT bug. Please see
// http://192.18.37.44/forums/index.php?topic=10572 for a discussion.
// It is only needed on first call, so we avoid it on all subsequent calls
// due to performance.
if (firstLockSucceeded)
return lockAndInitHandle(lock_buffer, canvas);
else
try {
final Object result = AccessController.doPrivileged(new PrivilegedExceptionAction() {
public Object run() throws LWJGLException {
return Boolean.valueOf(lockAndInitHandle(lock_buffer, canvas));
}
});
firstLockSucceeded = ((Boolean) result).booleanValue();
return firstLockSucceeded;
} catch (PrivilegedActionException e) {
throw (LWJGLException) e.getException();
}
}
private static native boolean lockAndInitHandle(ByteBuffer lock_buffer, Canvas canvas) throws LWJGLException;
protected void unlock() throws LWJGLException {
nUnlock(lock_buffer);
}
private static native void nUnlock(ByteBuffer lock_buffer) throws LWJGLException;
}
}