should not be hanging

import win32file
import win32con
import win32event
import pywintypes

FILE_LIST_DIRECTORY = 0x0001
folder = r"C:\some folder to watch"

handle = win32file.CreateFile (folder, FILE_LIST_DIRECTORY,
              win32con.FILE_SHARE_READ | win32con.FILE_SHARE_WRITE,
              None, win32con.OPEN_EXISTING,
              win32con.FILE_FLAG_BACKUP_SEMANTICS, None)
buffer = win32file.AllocateReadBuffer(1024)
overlapped = pywintypes.OVERLAPPED()
overlapped.hEvent = win32event.CreateEvent(None, 0, 0, None)
flags = win32con.FILE_NOTIFY_CHANGE_FILE_NAME |\
                  win32con.FILE_NOTIFY_CHANGE_DIR_NAME |\
                  win32con.FILE_NOTIFY_CHANGE_ATTRIBUTES |\
                  win32con.FILE_NOTIFY_CHANGE_SIZE |\
                  win32con.FILE_NOTIFY_CHANGE_LAST_WRITE |\
                  win32con.FILE_NOTIFY_CHANGE_SECURITY

win32file.ReadDirectoryChangesW(handle, buffer, False, flags, overlapped)
print "never reached until a change is done in the folder"
#win32event.WaitForSingleObject(overlapped.hEvent, 5000)