I have to program a simple threaded program with MFC/C++ for a uni assignment.

I have a simple scenario in wich i have a worked thread which executes a function along the lines of :

UINT createSchedules(LPVOID param)
{
  genProgThreadVal* v = (genProgThreadVal*) param;
  // v->searcherLock is of type CcriticalSection*
  while(1)
  {
    if(v->searcherLock->Lock())
    {
      //do the stuff, access shared object , exit clause etc..
      v->searcherLock->Unlock();
    }
  }
  PostMessage(v->hwnd, WM_USER_THREAD_FINISHED , 0,0);
  delete v;
  return 0;
}

In my main UI class, i have a CListControl that i want to be able to access the shared object (of type std::List). Hence the locking stuff. So this CList has an handler function looking like this :

void Ccreationprogramme::OnLvnItemchangedList5(NMHDR *pNMHDR, LRESULT *pResult)
{
  LPNMLISTVIEW pNMLV = reinterpret_cast<LPNMLISTVIEW>(pNMHDR);
  if((pNMLV->uChanged & LVIF_STATE) 
    && (pNMLV->uNewState & LVNI_SELECTED))
  {    
    searcherLock.Lock();
    // do the stuff on shared object
    searcherLock.Unlock();

    // do some more stuff
  }
  *pResult = 0;
}

The searcherLock in both function is the same object. The worker thread function is passed a pointer to the CCriticalSection object, which is a member of my dialog class.

Everything works but, as soon as i do click on my list, and so triggers the handler function, the whole program hangs indefinitely.I tried using a Cmutex. I tried using a CSingleLock wrapping over the critical section object, and none of this has worked. What am i missing ?