Re: How to do a thread dump from program?

[Juergen Kreileder]

>>>>> Mario Camou writes:

    Mario> Hi,
    Mario> I'm having some problems with threads, so I need to do a
    Mario> thread dump (same thing that Ctrl-\ does) but from within
    Mario> the program (i.e., I catch an Exception and want to do a
    Mario> thread dump that moment). Does anyone here know how to do
    Mario> that?

You can get a partial stack trace with Thread.dumpStack, or Throwable's
printStackTrace method.

    Mario> Basically, I'm getting an "IllegalMonitorStateException:
    Mario> current thread not owner" when I do a notifyAll(). This is
    Mario> with JDK 1.1.7v1a and the green threads package.

You need a lock on the object on which you want to call notifyAll().
E.g.:

  synchronized (o) {
      try {
          o.notifyAll();
      } catch (IllegalMonitorStateException e) {
          e.printStackTrace();
      }
  }

Note that the lock is on the object and not on the variable, that means
this code will throw an exception:

  synchronized (o) {
      o = referenceToAnotherObject;
      try {
          o.notifyAll();  // oops, we are not the owner of o's monitor
      } catch (IllegalMonitorStateException e) {
          e.printStackTrace();
      }
  }



        Juergen

-- 
Juergen Kreileder, Universitaet Dortmund, Lehrstuhl Informatik V
Baroper Strasse 301, D-44221 Dortmund, Germany
Phone: ++49 231/755-5806, Fax: ++49 231/755-5802