code: public void clear() {         // Smack a new empty table down
      CHM newchm = new CHM(this,new ConcurrentAutoTable(),MIN_SIZE_LOG);
      while( !CAS(_chm_offset,_chm,newchm) ) // Spin until the clear works
        ;
      CAS(_val_1_offset,_val_1,TOMBSTONE);
    }
docs: Removes all of the mappings from this map.