Message box as thread to stop main thread

[Yasir_Malik]

Hello,

My main thread does some computation indefinetly. To stop the computation, I created a thread that displays a message box, and when pressed, sets a global variable that stops the main program loop. However, my program just hangs when I get the start the thread. The message box does not show up either. Here's the code:

static bool keep_sending;

static UINT thread_func(LPVOID pParam)
{
  AfxMessageBox("Please OK to stop");
  keep_sending = false
  
  return 0;
}

void A::func(void)
{
  CWinThread *pthread;

  keep_sending = false;

  if(some_condition)
  {
    keep_sending = true;
    pthread = AfxBeginThread(thread_func, NULL, THREAD_PRIORITY_NORMAL);
  }
  
  do
  {
    // do some stuff
  }while(keep_sending);
}

Thanks.