`BRPOP`

Blocking right pop across one or more lists (effect logged as RPOP).

構文	`BRPOP key [key ...] timeout`
グループ	list
引数の数	-3
導入バージョン	1.0.0
フラグ	write, blocking
計算量	O(1) to serve; FIFO park
Redis 互換性	differs: same multi-key priority deviation as BLPOP