Man pages matching name futex in section 7:

futex.7.en	debian 10 / manpages
futex.7.ja	debian 10 / manpages-ja
futex.7.en	debian 11 / manpages
futex.7.es	debian 11 / manpages-es
futex.7.ja	debian 11 / manpages-ja
futex.7.en	debian 12 / manpages
futex.7.es	debian 12 / manpages-es
futex.7.fr	debian 12 / manpages-fr
futex.7.ja	debian 12 / manpages-ja
futex.7.ru	debian 12 / manpages-ru