Liangxu Linux

Sep 2, 2025 · Fundamentals

Master Linux Timers: From alarm() to timerfd – Choose the Right One

This article walks through the evolution of Linux timers—from the simple alarm() function, through setitimer() and POSIX timer APIs, to the modern timerfd interface—explaining their APIs, code examples, advantages, limitations, performance trade‑offs, and practical selection guidance for different projects.