sg_lock_mutex(3) on Linux
The text 51b16b57c926, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
guard not MT-safe system API
The text 51b16b57c926, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
guard not MT-safe system API