Dual core question

Question

I created a java program that runs a whois pearl script on the ip addresses in the program�s array. The program runs flawlessly on a single core processor, but when I run the program on my dual core, sometimes some threads (synchronized threads) return an exit value of 9 instead of 0. I tried finding out what this exit value means, but could not find any information on it, so my questions are: 1) does anyone know what this exit value means? 2) Do I need to change the way I use threads when it comes to multi-core processors?
Thanks for your time

Answer 1

A Thread doesn't have a return value. At least, the standard Thread class in the Java API doesn't. Now it's possible you are working with a class that somebody else wrote, and it wraps a Thread with something that does somehow return a value. Or something like that. But if that's the case, you should direct your questions about the return value to whoever wrote the code.
Or if that person has vanished and taken all copies of the documentation (if there ever was any) then you could post the code here.