Feature request: lock a key

[Per Wigren]

Hi! I'm new to this list but I have used memcached a bit and I love it, but there is a feature that I REALLY want: The ability to lock a key so any other processes that try to get it will wait until it is unlocked again.

Consider this example:

$local_array = $cache->get('global_array');
 array_push($local_array, 'I want to be here too!');
$cache->set('global_array', $local_array);

This will cause a race contition when several processes will try to update the array at the same time.

lock/unlock methods would solve this:

$cache->lock('global_array',$ttl);
 $local_array = $cache->get('global_array');
  array_push($local_array, 'I want to be here too!');
 $cache->set('global_array', $local_array);
$cache->unlock('global_array');

Regards,
Per Wigren