OPPO Kernel Craftsman

Sep 23, 2022 · Fundamentals

Understanding Linux Futex: Mechanism, APIs, and Priority Inheritance

Linux futexes provide a fast userspace lock backed by a kernel wait queue, using atomic operations when uncontended and system calls such as FUTEX_WAIT, FUTEX_WAKE, and priority‑inheritance variants to manage contention, requeueing, and priority inversion via rt‑mutex structures.