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      1 /*
      2  * Licensed to the Apache Software Foundation (ASF) under one or more
      3  * contributor license agreements.  See the NOTICE file distributed with
      4  * this work for additional information regarding copyright ownership.
      5  * The ASF licenses this file to You under the Apache License, Version 2.0
      6  * (the "License"); you may not use this file except in compliance with
      7  * the License.  You may obtain a copy of the License at
      8  *
      9  *     http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  *  Unless required by applicable law or agreed to in writing, software
     12  *  distributed under the License is distributed on an "AS IS" BASIS,
     13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  *
     15  *  See the License for the specific language governing permissions and
     16  *  limitations under the License.
     17  */
     18 
     19 package org.apache.harmony.jpda.tests.jdwp.ThreadReference;
     20 
     21 import org.apache.harmony.jpda.tests.framework.DebuggeeSynchronizer;
     22 import org.apache.harmony.jpda.tests.framework.LogWriter;
     23 import org.apache.harmony.jpda.tests.share.JPDADebuggeeSynchronizer;
     24 import org.apache.harmony.jpda.tests.share.SyncDebuggee;
     25 
     26 
     27 /**
     28  * The class specifies debuggee for <code>org.apache.harmony.jpda.tests.jdwp.ThreadReference.OwnedMonitorsStackDepthInfoTest</code>.
     29  * This debuggee starts the tested thread <code>TESTED_THREAD</code> which
     30  * synchronized with test via the <code>SGNL_READY</code> and
     31  * <code>SGNL_CONTINUE</code> signals.
     32  */
     33 public class OwnedMonitorsStackDepthInfoDebuggee extends SyncDebuggee {
     34 
     35     public static final String TESTED_THREAD = "TestedThread";
     36 
     37     // These two objects are used
     38     static Object waitForStart = new Object();
     39     static Object waitForFinish = new Object();
     40 
     41     @Override
     42     public void run() {
     43         DebuggeeThread thrd = new DebuggeeThread(TESTED_THREAD,
     44                 logWriter, synchronizer);
     45 
     46         synchronized(waitForStart){
     47             thrd.start();
     48             try {
     49                 waitForStart.wait();
     50             } catch (InterruptedException e) {
     51 
     52             }
     53         }
     54 
     55         synchronized(waitForFinish){
     56             logWriter.println("thread is finished");
     57         }
     58     }
     59 
     60     static class DebuggeeThread extends Thread {
     61 
     62         LogWriter logWriter;
     63         DebuggeeSynchronizer synchronizer;
     64 
     65         public DebuggeeThread(String name, LogWriter logWriter,
     66                 DebuggeeSynchronizer synchronizer) {
     67             super(name);
     68             this.logWriter = logWriter;
     69             this.synchronizer = synchronizer;
     70         }
     71 
     72         // Deliberately make several stack frames with known monitor states.
     73 
     74         // 1. No monitors held in the outermost frame.
     75         @Override
     76         public void run() {
     77             run1();
     78         }
     79 
     80         // 2. One monitor ("this") held in the next frame.
     81         private synchronized void run1() {
     82             run2();
     83         }
     84 
     85         // 3. No monitors held in the next frame.
     86         private void run2() {
     87             run3();
     88         }
     89 
     90         // 4. Two monitors held in the frame after that.
     91         private void run3() {
     92             synchronized(OwnedMonitorsStackDepthInfoDebuggee.waitForFinish){
     93 
     94                 synchronized(OwnedMonitorsStackDepthInfoDebuggee.waitForStart){
     95 
     96                     OwnedMonitorsStackDepthInfoDebuggee.waitForStart.notifyAll();
     97 
     98                     logWriter.println(getName() +  ": started");
     99                     synchronizer.sendMessage(JPDADebuggeeSynchronizer.SGNL_READY);
    100 
    101                     logWriter.println(getName() +  ": wait for SGNL_CONTINUE");
    102                     synchronizer.receiveMessage(JPDADebuggeeSynchronizer.SGNL_CONTINUE);
    103                     logWriter.println(getName() +  ": finished");
    104                 }
    105             }
    106         }
    107     }
    108 
    109     public static void main(String [] args) {
    110         runDebuggee(OwnedMonitorsStackDepthInfoDebuggee.class);
    111     }
    112 }
    113