SDL_SemTryWait(3) on Linux
The text 81b8c9c0dbfc, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it. The page shows this text now.
Attempt to lock a semaphore but don't suspend the thread.