Trying to understand MicroC/OS-II

Hello i have a NEEK Board and i've runned web server example with sucess.

int main (int argc, char* argv, char* envp)
{
  /* Initialize the current flash block, for flash programming. */
  
  current_flash_block = -1;
  
  INT8U error_code;
  /* Clear the RTOS timer */
  OSTimeSet(0);
  
  /* WSInitialTask will initialize the NicheStack TCP/IP Stack and then 
   * initialize the rest of the web server's tasks.
   */ 
  error_code = OSTaskCreateExt(WSInitialTask,
                             NULL,
                             (void *)&WSInitialTaskStk,
                             WS_INITIAL_TASK_PRIO,
                             WS_INITIAL_TASK_PRIO,
                             WSInitialTaskStk,
                             TASK_STACKSIZE,
                             NULL,
                             0);
  alt_uCOSIIErrorHandler(error_code, 0);
  /*
   * As with all MicroC/OS-II designs, once the initial thread(s) and 
   * associated RTOS resources are declared, we start the RTOS. That's it!
   */
  OSStart();
  
  while(1); /* Correct Program Flow never gets here. */
  return -1;
}