Linux Device Driver Development Cookbook by Rodolfo Giometti

Author:Rodolfo Giometti
Language: eng
Format: epub, mobi
Tags: COM067000 - COMPUTERS / Hardware / General, COM084000 - COMPUTERS / Desktop Applications / General, COM046070 - COMPUTERS / Operating Systems / Linux
Publisher: Packt Publishing
Published: 2019-05-30T13:08:10+00:00

How to do it...

First, let's see a simple example regarding a waitqueue used to wait for the "data is greater then 5" event.

Waitqueues

The following is the main part of the waitqueue.c file, which holds a simple example about waitqueues.

Again let's start from the end, to see the module init() function:

static int __init waitqueue_init(void)

{

int ret;

/* Save kernel timer delay */

wqinfo.delay_jiffies = msecs_to_jiffies(delay_ms);

pr_info("delay is set to %dms (%ld jiffies)\n",

delay_ms, wqinfo.delay_jiffies);

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