Available since: 2.0.0
Time complexity: O(N) where N is the number of provided keys.
BRPOP is a blocking list pop primitive.
It is the blocking version of
RPOP because it blocks the connection when there
are no elements to pop from any of the given lists.
An element is popped from the tail of the first list that is non-empty, with the
given keys being checked in the order that they are given.
Array reply: specifically:
nilmulti-bulk when no element could be popped and the timeout expired.
redis> DEL list1 list2 (integer) 0 redis> RPUSH list1 a b c (integer) 3 redis> BRPOP list1 list2 0 1) "list1" 2) "c"
timeoutis interpreted as a double instead of an integer.