// Starting at "start_addr" (inclusive) return a memory region
// corresponding to the first maximal contiguous marked ("1") region
// strictly less than end_addr.
inline MemRegion CMSBitMap::getAndClearMarkedRegion(HeapWord* start_addr,
                                                    HeapWord* end_addr) {
  HeapWord *start, *end;
  assert_locked();
  start = getNextMarkedWordAddress  (start_addr, end_addr);
  end   = getNextUnmarkedWordAddress(start,      end_addr);
  assert(start <= end, "Consistency check");
  MemRegion mr(start, end);
  if (!mr.is_empty()) {
    clear_range(mr);
  }
  return mr;
}
 inline void clear() { clear_range(0, size()); }