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workqueue_cheat.c

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/*

Usage:

insmod /workqueue_cheat.ko

# dmesg => worker

rmmod workqueue_cheat

Creates a separate thread. So init_module can return, but some work will still get done.

Can't call this just workqueue.c because there is already a built-in with that name:

https://unix.stackexchange.com/questions/364956/how-can-insmod-fail-with-kernel-module-is-already-loaded-even-is-lsmod-does-not

Workqueues are a convenience frontend for kthreads.

Bibliography:

- https://www.ibm.com/developerworks/library/l-tasklets/

*/

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/workqueue.h>

MODULE_LICENSE("GPL");

static struct workqueue_struct *queue;

static void work_func(struct work_struct *work)

{

printk(KERN_INFO "worker\n");

}

DECLARE_WORK(work, work_func);

static int myinit(void)

{

queue = create_singlethread_workqueue("myworkqueue");

queue_work(queue, &work);

return 0;

}

static void myexit(void)

{

/* Waits for jobs to finish. */

destroy_workqueue(queue);

}

module_init(myinit)

module_exit(myexit)