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From "weldon washburn (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HARMONY-3864) [drlvm][thread] VM sometimes hangs after ThreadGroup.setMaxPriority()
Date Mon, 18 Jun 2007 16:30:26 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-3864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

weldon washburn reassigned HARMONY-3864:
----------------------------------------

    Assignee: weldon washburn

> [drlvm][thread] VM sometimes hangs after ThreadGroup.setMaxPriority()
> ---------------------------------------------------------------------
>
>                 Key: HARMONY-3864
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3864
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: Windows and Linux
>            Reporter: Vera Petrashkova
>            Assignee: weldon washburn
>            Priority: Minor
>
> The following test demonstrates that sometimes VM hangs on some thread after invocation
of 
> the  method ThreadGroup.setMaxPriority(int) 
> ------------------ThreadGroupTest.java-----------------
> import java.io.*;
> public class ThreadGroupTest {
>     public static int nmbTG = 20;
>     public static int nmbTH = 20;
>     public static boolean isDaemon = false;
>     public static boolean setPrior = false;
>     public static void main(String[] args) {
>         if ((args.length >= 1) && "true".equals(args[0])) {
>             isDaemon = true;
>         }
>         if ((args.length >= 2) && "true".equals(args[1])) {
>             setPrior = true;
>         }
>         for (int t = 0; t < 100; t++) {
>             new ThreadGroupTest().test();
>             System.err.println("Step: "+t+"  finished");
>         }
>         System.err.println("Test passed");
>     }
>     public void test() {
>         ThreadGroup roottg = new ThreadGroup("root-tg");
>         roottg.setDaemon(isDaemon);
>         Thread_t [] threads1 = new Thread_t[nmbTH];
> 	for (int i = 0; i < nmbTH; i ++) {
>             threads1[i] = new Thread_t(roottg,"roottg");
>         }
>         ThreadGroup [] tg = new ThreadGroup[nmbTG];
>         Thread_t [][] threads = new Thread_t[nmbTG][nmbTH];
> 	for (int i = 0; i < nmbTG; i ++) {
>             tg[i] = new ThreadGroup(i == 0 ? roottg : tg[i-1], Integer.toString(i));
>             for (int j = 0; j < nmbTH; j++) {
>                 threads[i][j] = new Thread_t(tg[i],Integer.toString(j));
>             }
>         }
>         for (int i = 0; i < nmbTG; i ++) {
>             for (int j = 0; j < nmbTH; j++) {
>                    threads[i][j].setDaemon(tg[i].isDaemon());
>                    threads[i][j].start();
>             }
>         }
>         for (int i = 0; i < nmbTH; i ++) {
>             threads1[i].start();
>         }
>         for (int i = 0; i < nmbTG; i++) {
>             for (int j = 0; j < nmbTH; j++) {
>                 try {
>                     threads[i][j].join();
>                 } catch (Throwable e) {
>                     e.printStackTrace();
>                 }
>             }
>         }
>         for (int i = 0; i < nmbTH; i ++) {
>             try {
>                 threads1[i].join();
>             } catch (Throwable e) {
>                 e.printStackTrace();
>             }
>         }
>     }
> }
> class Thread_t extends Thread {
>     ThreadGroup tg;
>     String id;
>     public Thread_t (ThreadGroup tg, String n) {
>         super(tg, n);
>         this.tg = tg;
>         this.id = n;
>     }
>     public void run() {
>         int mp = tg.getMaxPriority();
>         if (ThreadGroupTest.setPrior ) {
>             tg.setMaxPriority(2); 
>         }
>         String[][] str = new String[10][100];        
>         for (int i = 0; i < str.length; ++i) {
>       
>             for (int j = 0; j < str[i].length; ++j) {
>                 str[i][j] = "" + i + "" + j;
>             }
>         }
>     }    
> }
> ------------------------------------------------------------------
> Run ThreadGroupTest several times
> I can not reproduce the issue on Windows for non daemon threads.
> But it is reproducible for daemon threads on Windows and for both kinds of thread on
Linux.
> java -cp . ThreadGroupTest true true
> Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software Foundation or
its l
> icensors, as applicable.
> java version "1.5.0"
> pre-alpha : not complete or compatible
> svn = r537729, (May 14 2007), Windows/ia32/msvc 1310, release build
> http://incubator.apache.org/harmony
> Step: 0  finished
> Step: 1  finished
> Step: 2  finished
> Step: 3  finished
> Step: 4  finished
> Step: 5  finished
> Step: 6  finished
> Step: 7  finished
> Step: 8  finished
> Step: 9  finished
> Step: 10  finished
> Step: 11  finished
> Step: 12  finished
> java -cp . ThreadGroupTest false true
> Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software Foundation or
its licensors, as applicable.
> java version "1.5.0" 
> pre-alpha : not complete or compatible
> svn = r537729, (May 14 2007), Linux/ia32/gcc 3.3.3, release build
> http://incubator.apache.org/harmony
> Step: 0  finished
> Step: 1  finished
> Step: 2  finished
> This bug causes the failure of the reliability test
> api.kernel.threadgroup.EnumerateTest
> from http://issues.apache.org/jira/browse/HARMONY-2918

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