https://jasper-aa64.github.io/tags/futex/Recent content in Futex on JasperHugoen-usWed, 21 Oct 2026 00:00:00 +0000https://jasper-aa64.github.io/posts/spinlock-implementation/Wed, 21 Oct 2026 00:00:00 +0000https://jasper-aa64.github.io/posts/spinlock-implementation/Whether a spinlock is fast depends on what its waiters do: if every attempt is a read-modify-write, they drag the lock’s line back and forth. Read before you grab, put PAUSE in the loop, back off after losing, and waiting costs the holder almost nothing.