| /* |
| * Copyright (c) 2005, 2015, 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 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 driver 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); |
| } |
| } |
| } |