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+/*
+ * Copyright 2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/* @test
+ @bug 4905777
+ @summary PrintWriter.println(Object) oversynchronized, can deadlock
+*/
+
+import java.io.PrintWriter;
+
+public class OversynchronizedTest extends Thread {
+ private static PrintWriter writer = new PrintWriter(System.out);
+ private static TestObj testObj = new TestObj("This is a test.", writer);
+ private static int loopNum = 100;
+
+ public void run() {
+ for(int i=0; i<loopNum; i++) {
+ testObj.test();
+
+ //passing an object to PrintWriter.println might cause deadlock
+ //if the object has a synchronized toString() method.
+ //using PrintWriter.println(testObj.toString()) won't have a problem
+ writer.println(testObj);
+ }
+ }
+
+ public static void main(String args[]) throws Exception {
+ // should no NullPointerException
+ writer.println((Object)null);
+
+ int num = 5;
+
+ OversynchronizedTest[] t = new OversynchronizedTest[num];
+ for(int i=0; i<num; i++) {
+ t[i] = new OversynchronizedTest();
+ t[i].start();
+ }
+
+ for(int i=0; i <num; i++) {
+ t[i].join();
+ }
+
+ System.out.println("Test completed");
+ }
+}
+
+class TestObj {
+ String mStr;
+
+ TestObj(String str, PrintWriter writer) {
+ mStr = str;
+ this.writer = writer;
+ }
+
+ synchronized void test() {
+ try {
+ long t = Math.round(Math.random()*10);
+ Thread.currentThread().sleep(t);
+ } catch (InterruptedException e) {
+ // jtreg timeout?
+ // Only jtreg will interrupt this thread so it knows what to do:
+ e.printStackTrace();
+ }
+
+ //the following line might cause hang if there is PrintWriter.println(testObj)
+ //called by other threads.
+ writer.println("In test().");
+ }
+
+ synchronized public String toString() {
+ writer.println("Calling toString\n");
+ return mStr;
+ }
+
+ private PrintWriter writer;
+}