This article explains the Linux kernel wait‑queue mechanism, detailing its data structures, sleep states, step‑by‑step process‑sleep and wake‑up procedures, core APIs, and a practical key‑driver example that demonstrates efficient blocking I/O without wasting CPU cycles.
This article explains how Linux kernel drivers use wait queues for process sleep and wake‑up, covering static and dynamic initialization, the various wait_event macros, wake‑up functions, complete driver source code, Makefile setup, and step‑by‑step build and testing instructions.
This article explains the Linux kernel's wait‑queue mechanism, the sleep and wake‑up logic behind socket events, and how the IO‑multiplexing models select, poll, and epoll are implemented, including their core code paths, performance trade‑offs, and edge versus level triggering.
This article explains the purpose and mechanics of process sleep in the Linux kernel, detailing how wait queues and wake‑up functions operate, why sleeping in atomic contexts such as interrupt handlers or while holding spinlocks is unsafe, and demonstrates the resulting deadlock with a sample driver.
This article explains the purpose and mechanics of process sleep in the Linux kernel, describes how wait queues and wake‑up functions operate, and details why sleeping in interrupt context or while holding spinlocks, seqlocks, or RCU locks leads to deadlocks and system crashes.
