CK_RWCOHORT_PROTOTYPE(3) on Linux
The text 0f909a3f98c9, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 9 (Stretch) shipped it. The page shows this text now.
define reader-writer cohort-based lock using the specified cohort type