stop Thread problem

  Could someone help with another problem I am having with a worker thread
program.

  The program uses a Start button to call the worker thread. And there is
also a Stop button if it is necessary to immediately stop the thread. And I
thought the correct way to do this would be to use a volatile bool variable
in the Stop button. However, I have found that it causes an compiler error
when using the bool variable in the static function of the worker thread.
And I tried to make the volatile bool variable, static also but that causes
a compiler error. So, what would the correct solution be to stopping the
thread (or a loop in the thread) with a Stop button.

The code below is not complete but it shows the problem.

void CThreadTestDlg::OnStart() //start button
{
    AfxBeginThread(Thread1, threadinputs);
    running = TRUE;
}

void CThreadTestDlg::OnStop() //stop button
{
    running = FALSE;
}

UINT CThreadTestDlg::Thread1(LPVOID lParam)
{
      for(int i=0; i<Num; ++i)
       {
           "function call statements here"

         if(running == FALSE)
           {
              return 0;
           }
         else
           continue;
      }
  return 0;
}