Jedis, distributed lock, possible without polling / sleep?

[mmm]

I've found, 

https://github.com/tonyghita/jedis-lock/blob/master/src/main/java/com/github/jedis/lock/JedisLock.java

and a few others similar to it. 

They all seem to rely on sleeping and trying again. 

Is there not a message event that one could listen to when someone changes the value (release lock), in order for a thread to wake up from sleep and try to aquire it themselves? 

The imeplementations of Jedis based locks I've seen so far is not ideal / perfect.