Solved

Check is spawned thread is running

Posted on 2009-04-03
12
2,299 Views
Last Modified: 2012-05-06
check is thread is still running

I have a class that is called from a page in a new thread and I have property on the class to check if the thread is still running.  Here is the scenario


I have a class ..................

public void work()
{
}



I have property on this class to check if a spawn thread is running

public static bool IsThreadRunning()
{
  lock (StillRunningLock)
  {
      isRunning = false;
      Thread.Sleep(2000);
      return isRunning;
  }
}


I have a method on the class that is called from an aspx page in a new thread.  I set the isrunning flag to true

public void dowork()
{
  isRunning = true;
}


I call the method from page

        var work = new work();        
        Thread newThread = new Thread(new ThreadStart(work.dowork()));
        newThread.Start();

I and redirect to a status page

     Response.Redirect("checkthreadstatus.aspx");

On status page I check the if thread is running by the property IsThreadRunning() like this

   work.IsThreadRunning()

But is always returning false even though I know that the thread is running - what is wrong with this?




0
Comment
Question by:mugsey
  • 6
  • 6
12 Comments
 
LVL 19

Expert Comment

by:alb66
ID: 24058872
Instead of

work.IsThreadRunning()

you can use

newThread.ThreadState == ThreadState.Running
0
 

Author Comment

by:mugsey
ID: 24058938
I want to be able to call
   work.IsThreadRunning()
from anywhere in the asp.net application so I cannot use that suggestion thanks
0
 
LVL 19

Accepted Solution

by:
alb66 earned 500 total points
ID: 24059011
>>>>>
public void dowork()
{
  isRunning = true;
}
>>>>>


I imagine that dowork() is a lenghty operation.

You need to do the assignment periodically:

public void dowork()
{
   for ( int ii=0; ii<200; ii++ )
   {
      isRunning = true;
      Thread.Sleep( 1000 );    <---- this should work
    }
}

public void dowork()
{
   for ( int ii=0; ii<200; ii++ )
   {
      isRunning = true;
      Thread.Sleep( 3000 );    <---- this doesn't work
    }
}

0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 19

Expert Comment

by:alb66
ID: 24059047
You put all the IsThreadRunning() code in a lock block.
Is that lock used in the dowork() function?
0
 

Author Comment

by:mugsey
ID: 24059092
This is somebody elses code; I think it was to cater for the status page being accessed simultaneiously,
Yes it is used for the dowork function
0
 

Author Comment

by:mugsey
ID: 24059103
I did try Thread.Sleep( 1000 ) but is still does not work
0
 
LVL 19

Expert Comment

by:alb66
ID: 24059130
>>>>> Yes it is used for the dowork function

So, maybe that when you call the IsThreadRunning() function the thread will be blocked until IsThreadRunning() is finished


>>>>> I did try Thread.Sleep( 1000 ) but is still does not work

I only write it as an example to say that you must assign isRunning = true at an interval time less then 2000, becuase in the IsThreadRunning function you test it after 2000 ms.
0
 

Author Comment

by:mugsey
ID: 24059142
OK thanks

Is there anyway you would suggest?
0
 
LVL 19

Expert Comment

by:alb66
ID: 24059162
Can you post the dowork() code?
0
 
LVL 19

Expert Comment

by:alb66
ID: 24059182
How is isRunning defined?
0
 

Author Comment

by:mugsey
ID: 24059206
In fact I did a page refresh on the status page and eventually it does work.  
So the problem is that when I do a response. redirect to the statuspage.

On page load I do

   work.IsThreadRunning()

if its true then display progress panel.

So the problem is here, once I do a page refresh after 30 secs or so it does work as expected.  Any suggestions on the page load?


0
 

Author Comment

by:mugsey
ID: 24059292
In fact can I get rid of thread.sleep ??
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Suggested Solutions

Parsing a CSV file is a task that we are confronted with regularly, and although there are a vast number of means to do this, as a newbie, the field can be confusing and the tools can seem complex. A simple solution to parsing a customized CSV fi…
The article shows the basic steps of integrating an HTML theme template into an ASP.NET MVC project

685 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