Solved

thread dont start

Posted on 2001-06-14
4
153 Views
Last Modified: 2010-03-31
i am runing a c++ program, calling java program through jni wrap.
the java program start 2 thread (totaly 3 java threads).
i insert print before the java thread start and in the run method, and i dont get the print in the run method.
e.g:

main thread:
a.start();
a.isAlive(); -> this one print true!!

and in a thread:
run()
{
System.out.println("start a"); -> this print i dont get
}

i run the same program on unix enviroment and it work o.k.
on nt enviroment using jre 1.3 and jre 1.1.7 - dont work.

there are several senarios in nt, that the small program do work, but i could not find the difrent when it work and not.
the senario that i have that this small program dont work, are those that the java thread are called before the start of the main c++ method. (they are called in the constractor of a global c++ object), but i have several other senarios like the above, that are called before the main c++ process start, that do work.
0
Comment
Question by:talih
  • 2
4 Comments
 
LVL 35

Expert Comment

by:TimYates
ID: 6191355
Do you extend thread, or implement runnable?

If you implement runnable, make sure you create your thread like:

a = new Thread( this ) ;

if you are extending thread, and overriding run() then it seems weird...can you post some code?

Good Luck,

Tim.
0
 

Expert Comment

by:mattdunlap
ID: 6192632
class Test implements Runnable
{
Test()
{
Thread t = new Thread(this);
t.start();
}
run()
{
System.out.println("test");
}
  public static void main(String arg[])
  {
    Test myTest = new Test();
  }
}

This should work?
but then again I learned Jave from my dog.
0
 
LVL 35

Accepted Solution

by:
TimYates earned 200 total points
ID: 6194335
Try:

class Test implements Runnable
{
private Thread t = null ;
public Test()
{
}

public void start()
{
  if( t == null )
  {
    t = new Thread(this);
    t.start();
  }
}

public void run()
{
  System.out.println( "test" ) ;
}

public void stop()
{
  t = null ;
}

public static void main(String arg[])
{
  Test myTest = new Test();
}

}


Tim.
0
 
LVL 14

Expert Comment

by:sudhakar_koundinya
ID: 9033790
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:


[points to TimYates]


Please leave any comments here within the next seven days.
 
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
 
sudhakar_koundinya
EE Cleanup Volunteer
---------------------
If you feel that your question was not properly addressed, or that none of the comments received were appropriate answers, please post your concern in THIS thread.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
HashMap Vs TreeMap 12 55
Java array passed to SQL where clause 23 61
Java and GPO 11 66
eclipse argument 14 53
Java had always been an easily readable and understandable language.  Some relatively recent changes in the language seem to be changing this pretty fast, and anyone that had not seen any Java code for the last 5 years will possibly have issues unde…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Viewers learn about the “while” loop and how to utilize it correctly in Java. Additionally, viewers begin exploring how to include conditional statements within a while loop and avoid an endless loop. Define While Loop: Basic Example: Explanatio…
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…

932 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now