8 Timer Implementation Patterns for Systems and Network Software

This story was originally published on HackerNoon at: https://hackernoon.com/8-timer-implementation-patterns-for-systems-and-network-software. A practical guide to system-side timer patterns, from hardware interrupts and OS APIs to timer wheels, heaps, polling, and event loops. Check more stories related to cybersecurity at: https://hackernoon.com/c/cybersecurity. You can also check exclusive content about #networking, #system-timers, #timer-architecture, #linux-timers, #network-protocol-timers, #bgp-hold-timers, #event-loop, #kernel-timers, and more. This story was written by: @vijayananda. Learn more about this writer by checking @vijayananda's about page, and for more stories, please visit hackernoon.com. System-side timers can be built in eight different ways — from hardware interrupts and OS APIs to timer wheels, heaps, and event loops. This article breaks down each approach and explains why timer wheels and event-loop-integrated timers (like libevent or epoll/timerfd) are the go-to choices for production networking software handling thousands of concurrent sessions, such as BGP or tunnel keepalives.