Re: [Sablevm-developer] Found deadlock in Class.getConstructor(Class[]).newInstance(Objects[])
Brought to you by:
egagnon
Menu
▾
▴
Re: [Sablevm-developer] Found deadlock in Class.getConstructor(Class[]).newInstance(Objects[])
|
From: Etienne G. <gag...@uq...> - 2004-04-15 16:58:02
|
Hi Clemens,
SableVM will dump a stack trace during execution when you cause a SIGQUIT
signal. On most systems you do this by pressing Ctrl-\ (Control key and "\"
key together). It gives much more information than a simple gdb stack dump
which does not tell us about the content of the Java stack.
I you have time, it would be grat if you also sent a minimal complete piece
of code that I could simply "compile and run" to exhibit the problem.
have fun!
Etienne
Clemens Eisserer wrote:
> Hello again!
>
> After reinstalling my whole gtk/gdk/atk/pango rpms your build-system now
> even worked on my system.
>
> I'm trying to use a lightweight gui library called "lwvcl", which is
> based on a swingle awt.component.
> At initialisation it does load some classes via class.forName and does
> some other class-based stuff.
> I think I've found a deadlock in
> Class.getConstructor(Class[]).newInstance(Objects[]).
>
> As you can see with this piece if code several different classes where
> loaded (some of them many times), but suddenly the method hangs when
>
> Here's the classname and the argument-type's list:
>
> So geladen:java.lang.String java.lang.String
> So geladen:java.lang.String java.lang.String
> So geladen:java.lang.String java.lang.String
> So geladen:LwBorder int
> So geladen:LwBorder int
> So geladen:LwBorder int
> So geladen:LwBorder int
> So geladen:LwBorder int
> So geladen:LwBorder int
> So geladen:LwImgSetRender java.lang.String int int int int int
> So geladen:LwImgSetRender java.lang.String int int int int int
> So geladen:LwImgSetRender java.lang.String int int int int int
> So geladen:LwImgSetRender java.lang.String int int int int int
> So geladen:LwImgSetRender java.lang.String int int int int int
> So geladen:LwImgSetRender java.lang.String int int int int int
> So geladen:LwImgSetRender java.lang.String int int int int int
> So geladen:LwImgSetRender java.lang.String int int int int int
> So geladen:LwImgSetRender java.lang.String int int int int int
> <----- Deadlock here
>
>
> I tried to debug it using gdb, but unlike without gdb I get a segfault.
> Here's the stacktrace:
>
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 16384 (LWP 2897)]
> _svmf_interpreter (_env=0x0) at interpreter.c:266
> 266 _svmt_method_info *method = frame->method;
> (gdb) bt
> #0 _svmf_interpreter (_env=0x0) at interpreter.c:266
> #1 0x40083491 in JNI_CreateJavaVM (pvm=0xbffff1e0, penv=0xbffff1e4,
> _vm_args=0xbffff1f0) at invoke_interface.c:293
> #2 0x08049e68 in main (argc=0, argv=0x0) at sablevm.c:1351
>
>
> And here's the method of the gui library that calls the deadlock-method:
>
> /**
> * Creates an instance of the specified class using appropriate
> constructor for the given input arguments list.
> * The list is set of arguments that are separated by the comma. The
> following arguments types can be
> * used:
> * <ul>
> * <li>Integer. If the argument does not equal "true" or "false" and
> is not bound by quotes.</li>
> * <li>Boolean. If the argument equals "true" or "false" and is not
> bound by quotes.</li>
> * <li>String. If the argument is not bound by quote.</li>
> * </ul>
> * @param <code>className</code> the specified class name.
> * @param <code>argsStr</code> the specified input arguments list. The
> argument can be <code>null</code>.
> * In this case the default constructor will be used to create the class
> instance.
> * @return an instance of the class.
> */
> public static Object createObj(String className, String argsStr)
> throws Exception
> {
> if (className.indexOf ('@') == 0) return
> getStaticObj(className.substring(1));
> else
> {
> Class classInstance =
> Class.forName(className.indexOf('.')>0?className:PACKAGE_NAME + className);
> Object objInstance = null;
> if (argsStr == null)
> {
> objInstance = classInstance.newInstance();
> }
> else
> {
> StringTokenizer args = new StringTokenizer(argsStr, ",");
> Class[] argsTypes = new Class [args.countTokens()];
> Object[] argsValues = new Object[argsTypes.length];
> for (int j = 0; args.hasMoreTokens(); j++)
> {
> String arg = args.nextToken().trim();
> if (arg.indexOf('\"')==0)
> {
> argsTypes [j] = String.class;
> argsValues[j] = arg.substring(1, arg.length() - 1);
> }
> else
> if (arg.equals("true") || arg.equals("false"))
> {
> argsTypes [j] = Boolean.TYPE;
> argsValues[j] = new Boolean(arg);
> }
> else
> if (arg.indexOf('@') == 0)
> {
> argsValues[j] = getStaticObj(arg.substring(1));
> argsTypes [j] = argsValues[j].getClass();
> }
> else
> {
> argsTypes [j] = Integer.TYPE;
> argsValues[j] = new Integer(arg);
> }
> }
> System.out.print("So geladen:"+className);
> for(int i=0; i < argsTypes.length; i++)
> {
> System.out.print(" "+argsTypes[i].getName());
> }
> System.out.println();
> objInstance =
> classInstance.getConstructor(argsTypes).newInstance(argsValues);
> }
> return objInstance;
> }
> }
>
>
> Maby this code isn't written well, however it works even with the
> Microsoft-JVM ;-)
>
> Hope this helped, lg Linuxhippy
>
>
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by: IBM Linux Tutorials
> Free Linux tutorial presented by Daniel Robbins, President and CEO of
> GenToo technologies. Learn everything from fundamentals to system
> administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click
> _______________________________________________
> Sablevm-developer mailing list
> Sab...@li...
> https://lists.sourceforge.net/lists/listinfo/sablevm-developer
>
> .
>
--
Etienne M. Gagnon, Ph.D. http://www.info.uqam.ca/~egagnon/
SableVM: http://www.sablevm.org/
SableCC: http://www.sablecc.org/
|
