--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/com/sun/jdi/TwoThreadsTest.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,245 @@
+/*
+ * 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 6296125
+ * @summary JDI: Disabling an EventRequest can cause a multi-threaded debuggee to hang
+ *
+ * @author jjh
+ *
+ * @run build TestScaffold VMConnection TargetListener TargetAdapter
+ * @run compile -g TwoThreadsTest.java
+ * @run main TwoThreadsTest
+ */
+import com.sun.jdi.*;
+import com.sun.jdi.event.*;
+import com.sun.jdi.request.*;
+
+import java.util.*;
+
+/*
+ * This debuggee basically runs two threads each of
+ * which loop, hitting a bkpt in each iteration.
+ *
+ */
+class TwoThreadsTarg extends Thread {
+ static boolean one = false;
+ static String name1 = "Thread 1";
+ static String name2 = "Thread 2";
+ static int count = 100;
+
+ public static void main(String[] args) {
+ System.out.println("Howdy!");
+ TwoThreadsTarg t1 = new TwoThreadsTarg(name1);
+ TwoThreadsTarg t2 = new TwoThreadsTarg(name2);
+
+ t1.start();
+ t2.start();
+ }
+
+ public TwoThreadsTarg(String name) {
+ super(name);
+ }
+
+ public void run() {
+ if (getName().equals(name1)) {
+ run1();
+ } else {
+ run2();
+ }
+ }
+
+ public void bkpt1(int i) {
+ yield();
+ }
+
+ public void run1() {
+ int i = 0;
+ while (i < count) {
+ i++;
+ bkpt1(i);
+ }
+ }
+
+ public void bkpt2(int i) {
+ yield();
+ }
+
+ public void run2() {
+ int i = 0;
+ while (i < count) {
+ i++;
+ bkpt2(i);
+ }
+ }
+}
+
+/********** test program **********/
+
+public class TwoThreadsTest extends TestScaffold {
+ ReferenceType targetClass;
+ ThreadReference mainThread;
+ BreakpointRequest request1;
+ BreakpointRequest request2;
+ static volatile int bkpts = 0;
+ Thread timerThread;
+ static int waitTime = 20000;
+
+ TwoThreadsTest (String args[]) {
+ super(args);
+ }
+
+ public static void main(String[] args) throws Exception {
+ new TwoThreadsTest(args).startTests();
+ }
+
+ /* BreakpointEvent handler */
+
+ public void breakpointReached(BreakpointEvent event) {
+ if (bkpts == 0) {
+ /*
+ * This thread will watch for n secs to go by with no
+ * calls to this method.
+ */
+ timerThread.start();
+ }
+
+ synchronized("abc") {
+ /*
+ * Note that this will most likely never get to
+ * the number of times the two bkpt lines in the debuggee
+ * are hit because bkpts are lost while they are disabled.
+ */
+ bkpts++;
+ }
+
+ /*
+ * The bug occurs when the requests are disabled
+ * and then re-enabled during the event handler.
+ */
+ request1.disable();
+ request2.disable();
+
+ /*
+ * This code between the disables and enables
+ * is just filler that leaves the requests disabled
+ * for awhile. I suppose a sleep could be used instead
+ */
+ Method mmm = event.location().method();
+ List lvlist;
+ try {
+ lvlist = mmm.variablesByName("i");
+ } catch (AbsentInformationException ee) {
+ failure("FAILED: can't get local var i");
+ return;
+ }
+ LocalVariable ivar = (LocalVariable)lvlist.get(0);
+
+ ThreadReference thr = event.thread();
+ StackFrame sf;
+ try {
+ sf = thr.frame(0);
+ } catch (IncompatibleThreadStateException ee) {
+ failure("FAILED: bad thread state");
+ return;
+ }
+ Value ival = sf.getValue(ivar);
+ println("Got bkpt at: " + event.location() + ", i = " + ival);
+ request1.enable();
+ request2.enable();
+
+ }
+
+ /********** test core **********/
+
+ protected void runTests() throws Exception {
+
+ /*
+ * Get to the top of main()
+ * to determine targetClass and mainThread
+ */
+ BreakpointEvent bpe = startToMain("TwoThreadsTarg");
+ targetClass = bpe.location().declaringType();
+ mainThread = bpe.thread();
+ EventRequestManager erm = vm().eventRequestManager();
+ final Thread mainThread = Thread.currentThread();
+
+ /*
+ * Set event requests
+ */
+ Location loc1 = findMethod(targetClass, "bkpt1", "(I)V").location();
+ Location loc2 = findMethod(targetClass, "bkpt2", "(I)V").location();
+ request1 = erm.createBreakpointRequest(loc1);
+ request2 = erm.createBreakpointRequest(loc2);
+ request1.enable();
+ request2.enable();
+
+ /*
+ * This thread will be started when we get the first bkpt.
+ * (Which we always expect to get).
+ * It awakens every n seconds and checks to see if we
+ * got any breakpoint events while it was asleep.
+ */
+ timerThread = new Thread("test timer") {
+ public void run() {
+ int myBkpts = bkpts;
+ while (true) {
+ try {
+ Thread.sleep(waitTime);
+ System.out.println("bkpts = " + bkpts);
+ if (myBkpts == bkpts) {
+ // no bkpt for 'waitTime' secs
+ failure("failure: Debuggee appears to be hung");
+ vmDisconnected = true;
+ // This awakens the main thread which is
+ // waiting for a VMDisconnect.
+ mainThread.interrupt();
+ break;
+ }
+ myBkpts = bkpts;
+ } catch (InterruptedException ee) {
+ // If the test completes, this occurs.
+ println("timer Interrupted");
+ break;
+ }
+ }
+ }
+ };
+
+ /*
+ * resume the target, listening for events
+ */
+ listenUntilVMDisconnect();
+ timerThread.interrupt();
+ /*
+ * deal with results of test
+ * if anything has called failure("foo") testFailed will be true
+ */
+ if (!testFailed) {
+ println("TwoThreadsTest: passed; bkpts = " + bkpts);
+ } else {
+ throw new Exception("TwoThreadsTest: failed; bkpts = " + bkpts);
+ }
+ }
+}