linux create thread

#include "nf_hook.h"
#include "generate_lostpacket_seq.h"

#include <linux/timer.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/skbuff.h>
#include <linux/kthread.h>

static struct task_struct *tsk;

static int thread_function(void *data)
{
    while(!kthread_should_stop())
    {

    }
}

void create_thread(void)
{
    tsk = kthread_run(thread_function, NULL, "mythread", 1);
    if (IS_ERR(tsk)) {
        printk(KERN_INFO "create kthread failed!\n");
    }
    else {
        printk(KERN_INFO "create ktrhead ok!\n");
    }    
}

void stop_thread(void)
{
    printk(KERN_INFO "Hello, exit!\n");
    if (!IS_ERR(tsk)){
        int ret = kthread_stop(tsk);
        printk(KERN_INFO "thread function has run %d\n", ret);
    }
}

void register_nfhook(int lostpacket_numerator)
{
    create_thread();
}

void unregister_nfhook(void)
{
    stop_thread();
}