|  | use Cache::Mmap;
 $cache=Cache::Mmap->new($filename,\%options);
    
      |  | Loads the module and binds to $filename, creating if it doesn't exist |  | 
      |  | ($found,$value1)=$cache->read($key1);
    
      |  | Fetch value from cache with key $key1 |  
      |  | $foundis true if item found in cache or underlying data |  | 
      |  | $cache->write($key2,$value2);
    
      |  | Update/insert value into cache with key $key2. |  
      |  | Update underlying data if appropriate options set |  | 
      |  | $cache->delete($key3);
    
      |  | Delete cache entry $key3from cache. |  
      |  | Update underlying data if appropriate options set |  |