Re: Image capture -- renegade threads

• To: Bill Hibbard <billh@xxxxxxxxxxxxx>
• Subject: Re: Image capture -- renegade threads
• From: Leah Heiss <leah@xxxxxxxxxxxxxxxxxx>
• Date: Fri, 15 Aug 2003 09:39:09 -0700 (PDT)

I've tried calling destroy() on my DisplayImpls, but there are still
threads running and my app won't exit.  I wanted to try out destroy
on a simpler piece of code, so I modified the Rivers.java example to
call display.destroy().  Nothing happened.  A call to
Thread.activeCount() indicated that there were still 7 threads running.

It seems that there must be some other threads somewhere that aren't
being destroyed.  I understand that I may call System.exit(), but I'm
trying to capture a series of images (in a for loop), so System.exit()
isn't really what I want to do.

Any other suggestions or hints of where to look for these everlasting
threads?

Thanks.

Leah


On Fri, 1 Aug 2003, Bill Hibbard wrote:

> Hi Leah,
>
> There are one or more Threads inside a DisplayImpl. You
> should be able to stop them with a call to the destroy()
> method of each DisplayImpl. Or just call System.exit(0).
>
> Good luck,
> Bill
>
> On Fri, 1 Aug 2003, Leah Heiss wrote:
>
> > Hello visad-list
> >
> > I have another question for you regarding offscreen image rendering.
> >
> > I've set a up a simple class to capture my images, but the process never
> > completes -- my program never exits.  It seems to me that there must be
> > some thread buried deep inside VisAD that isn't finishing.
> >
> >
> > Here's the general outline of my code:
> >
> > public class ImageMaker{
> >
> >     public void main( String[] args ){
> >             captureImages();
> >             return;
> >     }
> >
> >     private void captureImages(){
> >             // create DisplayImpl
> >             // add data to DisplayImpl
> >             // call thread to capture images
> >             Thread thread = new ImageCapturer( DisplayImpl disp );
> >             thread.start();
> >             System.out.println( "All Done!" );
> >             return;
> >     }
> >
> >     class ImageCapturer extends Thread{
> >
> >             // constructor
> >
> >             // run
> >             public void run(){
> >                     // get the image
> >                     // write it to file
> >                     System.out.println( "Thread Done!" );
> >             }
> >     }
> > }
> >
> >
> > I run the code with
> > > java ImageMaker
> > And see...
> > All Done!
> > Thread Done!
> >
> > But the prompt never comes back.  What is still running that won't let my
> > program exit?
> >
> >
> > Thanks for the help.
> >
> > Leah
> >
> >
>

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  • Re: Image capture -- renegade threads
    • From: Bill Hibbard