C / C++ / MFC

// in ThreadStatus.h
class CThreadStatus
{
};

//in MyThread.h  STRUCT
class CMyThread
{
  private:
    CThreadStatus m_threadStatus;
    void PostHostMessage(int nMsg, int nSubMsg);
};

//and in the thread class, I PostHostMessage does this:
void CHostThread::PostHostMsg(int nMsg, int nSubMsg)
{
  // Reset all the data mmbers in the threadstatus object to 0.
  // (All data memebers are integers.)
  m_ThreadStatus.Reset();
  // now, we set everything to current values
  m_ThreadStatus.m_nMessage    = nMsg;
  m_ThreadStatus.m_nSubMessage = nSubMsg;
  m_ThreadStatus.m_nHostID     = m_nHostID;
  m_ThreadStatus.m_nRaceNumber = m_nCurrentRace;
  // and post the message to the thread owner (the dialog box)
  m_pOwner->PostMessage(UWM_LAUNCHERMSG, WPARAM(&m_ThreadStatus), 0);
}

LRESULT CDlg::OnLauncherMsg(WPARAM wParam, LPARAM, lParam)
{
  lParam;
  LRESULT lResult = 1L;
  CThreadStatus* threadStatus = (CThreadStatus*)wParam;
  int nMsg    = threadStatus->m_nMessage;
  switch (nMsg)
 {
   case MSG_SCHED : 
     // updates a list control
     HandleSche dMsg(threadStatus);
     break;
   case MSG_SIM    :
     // updates a list control
     HandleSimMsg(threadStatus);
     break;
   case MSG_DEMONS :
     // manipulates the other threads (may stop or start other threads) 
     HandleDemonsMsg(threadStatus);
     break;
  }
  return lResult;
}