Snmp commands dont work once the thread starts

I am using multi-threading. Once my thread starts executing (using the CmtScheduleThreadPoolFunction), I am not able to run simple get and set snmp function, basically they never return. Any suggestions?
Thank you all in advance.

Hi qsa301,
Does your function call work without multithreading?
Is the function documented to be able to be called by multiple threads?
Here are some KnowledgeBases about CVI and multithreading:
Executing LabWindows/CVI Internet Library Functions from Multiple Threads
http://digital.ni.com/public.nsf/websearch/88AC3C540ACFE65186257021005D2084?OpenDocument
Multithreading in LabWindows/CVI
http://zone.ni.com/devzone/cda/tut/p/id/3663
General Information on Multithreading for C Programmers
http://digital.ni.com/public.nsf/websearch/6ECCBAA87476EB22862568950071CCD6?OpenDocument
Sending Parameters to a Thread Callback Function in LabWindows/CVI
http://digital.ni.com/public.nsf/websearch/A50A89929B77EE06862571BF0015F42F?OpenDocument
LabWindows/CVI and Thread Pools
http://digital.ni.com/public.nsf/websearch/F968F9F8B100393786256D25005EAF8A?OpenDocument
Gavin Fox
Systems Software
National Instruments

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Hi there,
I got the program below. I am wondering why are the threads start and terminate randomly? Everytime, I run the program, it produces different results.
I know that these four threads have got same normal priority (should be 5), and under windows there is something called timeslice. Then these four threads rotate using this timeslice. How do we know what exactly the timeslice is in seconds? If the timeslice is fix, then why the results are ramdom?
Thanks in advance!
* To change this template, choose Tools | Templates
* and open the template in the editor.
package mythreadone;
* @author Administrator
public class MyThreadOne implements Runnable {
String tName;
Thread t;
MyThreadOne(String threadName) {
tName = threadName;
t = new Thread(this, tName);
t.start();
public void run() {
try {
System.out.println("Thread: " + tName);
Thread.sleep(2000);
} catch (InterruptedException e) {
System.out.println("Exception: Thread "
+ tName + " interrupted");
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public static void main(String args[]) {
// Why are the threads start and terminate randomly?
new MyThreadOne("1");
new MyThreadOne("2");
new MyThreadOne("3");
new MyThreadOne("4");
try {
Thread.sleep(10000);
// Thread.sleep(2000);
} catch (InterruptedException e) {
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System.out.println(
"Terminating thread: main thread.");
1. Firstly, I set in the main function:
Thread.sleep(10000);
and I run the program it gives:
Thread: 1
Thread: 4
Thread: 2
Thread: 3
Terminating thread: 1
Terminating thread: 3
Terminating thread: 4
Terminating thread: 2
Terminating thread: main thread.
BUILD SUCCESSFUL (total time: 10 seconds)
Run it again, it gives:
Thread: 2
Thread: 4
Thread: 3
Thread: 1
Terminating thread: 2
Terminating thread: 1
Terminating thread: 3
Terminating thread: 4
Terminating thread: main thread.
BUILD SUCCESSFUL (total time: 10 seconds)
And my question was why it outputs like this? It suppose to be:
Thread: 1
Thread: 2
Thread: 3
Thread: 4
Terminating thread: 1
Terminating thread: 2
Terminating thread: 3
Terminating thread: 4
Terminating thread: main thread.
BUILD SUCCESSFUL (total time: 10 seconds)
Why these four threads start and finish randomly each time I run the program? I use Windows, suppose there is a timeslice (i.e. 1 second), these threads have the same priority. Then the threads should start and finish in turn one by one. Am I right?
2. My second question is:
When I change the codes in the 'main' function into:
Thread.sleep(10000); -> Thread.sleep(2000);
it gives me the results like:
Thread: 1
Thread: 4
Thread: 3
Thread: 2
Terminating thread: main thread.
Terminating thread: 1
Terminating thread: 4
Terminating thread: 3
Terminating thread: 2
BUILD SUCCESSFUL (total time: 2 seconds)
Run it again:
Thread: 1
Thread: 2
Thread: 3
Thread: 4
Terminating thread: 3
Terminating thread: main thread.
Terminating thread: 4
Terminating thread: 2
Terminating thread: 1
BUILD SUCCESSFUL (total time: 2 seconds)
I tried several times. The main thread always terminates before or after the first child thread finished.
My question is why it doesn't output something like:
Thread: 1
Thread: 2
Thread: 3
Thread: 4
Terminating thread: 3
Terminating thread: 4
Terminating thread: 2
Terminating thread: main thread.
Terminating thread: 1
BUILD SUCCESSFUL (total time: 2 seconds)
or
Thread: 1
Thread: 2
Thread: 3
Thread: 4
Terminating thread: 3
Terminating thread: 4
Terminating thread: 2
Terminating thread: 1
Terminating thread: main thread.
BUILD SUCCESSFUL (total time: 2 seconds)

user13476736 wrote:
Yes, my machine has multi-core. Then you mean that if I got a one core machine the result should always be:
Thread: 1
Thread: 2
Thread: 3
Thread: 4
Terminating thread: 1
Terminating thread: 2
Terminating thread: 3
Terminating thread: 4
Terminating thread: main thread.
BUILD SUCCESSFUL (total time: 10 seconds)
???No.
>
How to explain my second quesiton then? Why the main thread always terminates before some of the child threads end? Thanks a lot.

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k...well ive made it so that the client can see what they have just sent....but i cant seem to make is so that the can see wot the server and wot other clients have sent...here is some update code:
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                         getdata.start();                                                                           // thread
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Last edited by kjozsa (2008-09-18 13:43:07)

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Snmp commands dont work once the thread starts

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