BLPOP key1 key2 ... keyN timeout

Syntax

BLPOP key1 key2 ... keyN timeout

     It is blocked implementation of LPOP command. It blocks, if there  are no elementsfrom any of the lists to pop. It waits for specific timeout and returns nil if no element to pop after timeout.

Returns

Returns the popped element and the list form which list it poped.

127.0.0.1:6379> lpush list1 1 2 3 
(integer) 3 
127.0.0.1:6379> lpush list2 4 5 6 
(integer) 3 
127.0.0.1:6379> lpush list3 7 8 9 
(integer) 3 
127.0.0.1:6379> blpop list1 list2 list3 1000 
1) "list1" 
2) "3" 
127.0.0.1:6379> blpop list1 list2 list3 1000 
1) "list1" 
2) "2" 
127.0.0.1:6379> blpop list1 list2 list3 1000 
1) "list1" 
2) "1" 
127.0.0.1:6379> blpop list1 list2 list3 1000 
1) "list2" 
2) "6" 
127.0.0.1:6379> blpop list1 list2 list3 1000 
1) "list2" 
2) "5" 
127.0.0.1:6379> blpop list1 list2 list3 1000 
1) "list2" 
2) "4" 
127.0.0.1:6379> blpop list1 list2 list3 1000 
1) "list3" 
2) "9" 

 

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