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/*
* Copyright (c) 2002, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
@test
@bug 4760364
@summary Tests that the deadlock doesn't happen when two apps request
selection data from each other.
@key headful
*/
import java.awt.EventQueue;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.ClipboardOwner;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
public class DataConversionDeadlockTest {
public static void main(String[] args) {
DataConversionDeadlockTest parent = new DataConversionDeadlockTest();
parent.start();
}
public void start() {
try {
String javaPath = System.getProperty("java.home", "");
String cmd = javaPath + File.separator + "bin" +
File.separator + "java -cp " +
System.getProperty("test.classes", ".") +
" DataConversionDeadlockTestChild";
Process process = Runtime.getRuntime().exec(cmd);
ProcessResults pres = ProcessResults.doWaitFor(process);
if (pres.stderr != null && pres.stderr.length() > 0) {
System.err.println("========= Child VM System.err ========");
System.err.print(pres.stderr);
System.err.println("======================================");
}
if (pres.stdout != null && pres.stdout.length() > 0) {
System.err.println("========= Child VM System.out ========");
System.err.print(pres.stdout);
System.err.println("======================================");
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
class DataConversionDeadlockTestChild implements ClipboardOwner, Runnable {
private static final Toolkit toolkit = Toolkit.getDefaultToolkit();
private static final Clipboard clipboard = toolkit.getSystemClipboard();
private static final Clipboard selection = toolkit.getSystemSelection();
private static final Transferable t = new StringSelection("TEXT");
public void lostOwnership(Clipboard cb, Transferable contents) {
ClipboardUtil.setClipboardContents(selection, t, this);
new Thread(this).start();
}
public void run() {
for (int i = 0; i < 100; i++) {
EventQueue.invokeLater(new Runnable() {
public void run() {
ClipboardUtil.getClipboardContents(clipboard, null);
}
});
}
}
public static void main(String[] args) {
if (clipboard == null || selection == null) {
return;
}
ClipboardUtil.setClipboardContents(clipboard, t, null);
for (int i = 0; i < 100; i++) {
EventQueue.invokeLater(new Runnable() {
public void run() {
ClipboardUtil.getClipboardContents(selection, null);
}
});
}
}
}
class ClipboardUtil {
public static void setClipboardContents(Clipboard cb,
Transferable contents,
ClipboardOwner owner) {
synchronized (cb) {
boolean set = false;
while (!set) {
try {
cb.setContents(contents, owner);
set = true;
} catch (IllegalStateException ise) {
try { Thread.sleep(100); }
catch (InterruptedException e) { e.printStackTrace(); }
}
}
}
}
public static Transferable getClipboardContents(Clipboard cb,
Object requestor) {
synchronized (cb) {
while (true) {
try {
Transferable t = cb.getContents(requestor);
return t;
} catch (IllegalStateException ise) {
try { Thread.sleep(100); }
catch (InterruptedException e) { e.printStackTrace(); }
}
}
}
}
}
class ProcessResults {
public int exitValue;
public String stdout;
public String stderr;
public ProcessResults() {
exitValue = -1;
stdout = "";
stderr = "";
}
/**
* Method to perform a "wait" for a process and return its exit value.
* This is a workaround for <code>Process.waitFor()</code> never returning.
*/
public static ProcessResults doWaitFor(Process p) {
ProcessResults pres = new ProcessResults();
InputStream in = null;
InputStream err = null;
try {
in = p.getInputStream();
err = p.getErrorStream();
boolean finished = false;
while (!finished) {
try {
while (in.available() > 0) {
pres.stdout += (char)in.read();
}
while (err.available() > 0) {
pres.stderr += (char)err.read();
}
// Ask the process for its exitValue. If the process
// is not finished, an IllegalThreadStateException
// is thrown. If it is finished, we fall through and
// the variable finished is set to true.
pres.exitValue = p.exitValue();
finished = true;
}
catch (IllegalThreadStateException e) {
// Process is not finished yet;
// Sleep a little to save on CPU cycles
Thread.currentThread().sleep(500);
}
}
if (in != null) in.close();
if (err != null) err.close();
}
catch (Throwable e) {
System.err.println("doWaitFor(): unexpected exception");
e.printStackTrace();
}
return pres;
}
}
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