J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /** |
| 25 | * @test |
| 26 | * @bug 6296125 |
| 27 | * @summary JDI: Disabling an EventRequest can cause a multi-threaded debuggee to hang |
| 28 | * |
| 29 | * @author jjh |
| 30 | * |
| 31 | * @run build TestScaffold VMConnection TargetListener TargetAdapter |
| 32 | * @run compile -g TwoThreadsTest.java |
| 33 | * @run main TwoThreadsTest |
| 34 | */ |
| 35 | import com.sun.jdi.*; |
| 36 | import com.sun.jdi.event.*; |
| 37 | import com.sun.jdi.request.*; |
| 38 | |
| 39 | import java.util.*; |
| 40 | |
| 41 | /* |
| 42 | * This debuggee basically runs two threads each of |
| 43 | * which loop, hitting a bkpt in each iteration. |
| 44 | * |
| 45 | */ |
| 46 | class TwoThreadsTarg extends Thread { |
| 47 | static boolean one = false; |
| 48 | static String name1 = "Thread 1"; |
| 49 | static String name2 = "Thread 2"; |
| 50 | static int count = 100; |
| 51 | |
| 52 | public static void main(String[] args) { |
| 53 | System.out.println("Howdy!"); |
| 54 | TwoThreadsTarg t1 = new TwoThreadsTarg(name1); |
| 55 | TwoThreadsTarg t2 = new TwoThreadsTarg(name2); |
| 56 | |
| 57 | t1.start(); |
| 58 | t2.start(); |
| 59 | } |
| 60 | |
| 61 | public TwoThreadsTarg(String name) { |
| 62 | super(name); |
| 63 | } |
| 64 | |
| 65 | public void run() { |
| 66 | if (getName().equals(name1)) { |
| 67 | run1(); |
| 68 | } else { |
| 69 | run2(); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | public void bkpt1(int i) { |
| 74 | yield(); |
| 75 | } |
| 76 | |
| 77 | public void run1() { |
| 78 | int i = 0; |
| 79 | while (i < count) { |
| 80 | i++; |
| 81 | bkpt1(i); |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | public void bkpt2(int i) { |
| 86 | yield(); |
| 87 | } |
| 88 | |
| 89 | public void run2() { |
| 90 | int i = 0; |
| 91 | while (i < count) { |
| 92 | i++; |
| 93 | bkpt2(i); |
| 94 | } |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | /********** test program **********/ |
| 99 | |
| 100 | public class TwoThreadsTest extends TestScaffold { |
| 101 | ReferenceType targetClass; |
| 102 | ThreadReference mainThread; |
| 103 | BreakpointRequest request1; |
| 104 | BreakpointRequest request2; |
| 105 | static volatile int bkpts = 0; |
| 106 | Thread timerThread; |
| 107 | static int waitTime = 20000; |
| 108 | |
| 109 | TwoThreadsTest (String args[]) { |
| 110 | super(args); |
| 111 | } |
| 112 | |
| 113 | public static void main(String[] args) throws Exception { |
| 114 | new TwoThreadsTest(args).startTests(); |
| 115 | } |
| 116 | |
| 117 | /* BreakpointEvent handler */ |
| 118 | |
| 119 | public void breakpointReached(BreakpointEvent event) { |
| 120 | if (bkpts == 0) { |
| 121 | /* |
| 122 | * This thread will watch for n secs to go by with no |
| 123 | * calls to this method. |
| 124 | */ |
| 125 | timerThread.start(); |
| 126 | } |
| 127 | |
| 128 | synchronized("abc") { |
| 129 | /* |
| 130 | * Note that this will most likely never get to |
| 131 | * the number of times the two bkpt lines in the debuggee |
| 132 | * are hit because bkpts are lost while they are disabled. |
| 133 | */ |
| 134 | bkpts++; |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * The bug occurs when the requests are disabled |
| 139 | * and then re-enabled during the event handler. |
| 140 | */ |
| 141 | request1.disable(); |
| 142 | request2.disable(); |
| 143 | |
| 144 | /* |
| 145 | * This code between the disables and enables |
| 146 | * is just filler that leaves the requests disabled |
| 147 | * for awhile. I suppose a sleep could be used instead |
| 148 | */ |
| 149 | Method mmm = event.location().method(); |
| 150 | List lvlist; |
| 151 | try { |
| 152 | lvlist = mmm.variablesByName("i"); |
| 153 | } catch (AbsentInformationException ee) { |
| 154 | failure("FAILED: can't get local var i"); |
| 155 | return; |
| 156 | } |
| 157 | LocalVariable ivar = (LocalVariable)lvlist.get(0); |
| 158 | |
| 159 | ThreadReference thr = event.thread(); |
| 160 | StackFrame sf; |
| 161 | try { |
| 162 | sf = thr.frame(0); |
| 163 | } catch (IncompatibleThreadStateException ee) { |
| 164 | failure("FAILED: bad thread state"); |
| 165 | return; |
| 166 | } |
| 167 | Value ival = sf.getValue(ivar); |
| 168 | println("Got bkpt at: " + event.location() + ", i = " + ival); |
| 169 | request1.enable(); |
| 170 | request2.enable(); |
| 171 | |
| 172 | } |
| 173 | |
| 174 | /********** test core **********/ |
| 175 | |
| 176 | protected void runTests() throws Exception { |
| 177 | |
| 178 | /* |
| 179 | * Get to the top of main() |
| 180 | * to determine targetClass and mainThread |
| 181 | */ |
| 182 | BreakpointEvent bpe = startToMain("TwoThreadsTarg"); |
| 183 | targetClass = bpe.location().declaringType(); |
| 184 | mainThread = bpe.thread(); |
| 185 | EventRequestManager erm = vm().eventRequestManager(); |
| 186 | final Thread mainThread = Thread.currentThread(); |
| 187 | |
| 188 | /* |
| 189 | * Set event requests |
| 190 | */ |
| 191 | Location loc1 = findMethod(targetClass, "bkpt1", "(I)V").location(); |
| 192 | Location loc2 = findMethod(targetClass, "bkpt2", "(I)V").location(); |
| 193 | request1 = erm.createBreakpointRequest(loc1); |
| 194 | request2 = erm.createBreakpointRequest(loc2); |
| 195 | request1.enable(); |
| 196 | request2.enable(); |
| 197 | |
| 198 | /* |
| 199 | * This thread will be started when we get the first bkpt. |
| 200 | * (Which we always expect to get). |
| 201 | * It awakens every n seconds and checks to see if we |
| 202 | * got any breakpoint events while it was asleep. |
| 203 | */ |
| 204 | timerThread = new Thread("test timer") { |
| 205 | public void run() { |
| 206 | int myBkpts = bkpts; |
| 207 | while (true) { |
| 208 | try { |
| 209 | Thread.sleep(waitTime); |
| 210 | System.out.println("bkpts = " + bkpts); |
| 211 | if (myBkpts == bkpts) { |
| 212 | // no bkpt for 'waitTime' secs |
| 213 | failure("failure: Debuggee appears to be hung"); |
| 214 | vmDisconnected = true; |
| 215 | // This awakens the main thread which is |
| 216 | // waiting for a VMDisconnect. |
| 217 | mainThread.interrupt(); |
| 218 | break; |
| 219 | } |
| 220 | myBkpts = bkpts; |
| 221 | } catch (InterruptedException ee) { |
| 222 | // If the test completes, this occurs. |
| 223 | println("timer Interrupted"); |
| 224 | break; |
| 225 | } |
| 226 | } |
| 227 | } |
| 228 | }; |
| 229 | |
| 230 | /* |
| 231 | * resume the target, listening for events |
| 232 | */ |
| 233 | listenUntilVMDisconnect(); |
| 234 | timerThread.interrupt(); |
| 235 | /* |
| 236 | * deal with results of test |
| 237 | * if anything has called failure("foo") testFailed will be true |
| 238 | */ |
| 239 | if (!testFailed) { |
| 240 | println("TwoThreadsTest: passed; bkpts = " + bkpts); |
| 241 | } else { |
| 242 | throw new Exception("TwoThreadsTest: failed; bkpts = " + bkpts); |
| 243 | } |
| 244 | } |
| 245 | } |