

A futex (short for fast user-space mutex) is a low-level kernel system call used in Linux (and some other operating systems) to implement synchronization primitives like mutexes, semaphores, and condition variables. It’s designed to minimize the need for expensive context switches between user and kernel space by handling most operations in user space with atomic operations.
I’ve had some top scores on some hardware. Usually because I was the only one who had run it on that exact model of server CPU, but still…