如何杀死 Linux Kernel 线程？

Question

I am developing Linux kernel module. This module is communicating with my user-space C application. In this module, I am creating a thread. this is a part of my module where I am facing the problem:

static struct task_struct *thread1;

static ssize_t read_pid(struct file *pfile, char __user *buffer, size_t length, loff_t *offset)
{

unsigned int rand;
get_random_bytes(&rand, sizeof(rand));
rand = rand % 250;
char our_thread[20];
sprintf(our_thread, "thread%u", rand);

if(thread1==NULL)
{
thread1 = kthread_create(read_in_thread,&args,our_thread);
    if((thread1))
        {
            printk(KERN_INFO "Thread is created\n");
            printk("thread name %s\n", our_thread);
            // lancement du thread
            wake_up_process(thread1);
            printk(KERN_INFO "Thread is awake\n");
        }
}

else

printk("THREAD1 IS NOT NULL!!! CAN NOT CREATE THREAD!!!\n");

}

When I execute my user-space program for the first time, everything is working well and it prints for me on the console:

Thread is created 
thread name
Thread is awake 

But when I press Ctrl+C to exit the running user space code and execute it again, it prints:

THREAD1 IS NOT NULL!!! CAN NOT CREATE THREAD!!!

I think that *thread1 is not free or the thread is not killed. I think that I need to kill the thread under else statement in order I can create another one when I re-run my program.

Could anyone help me? Thank you.

Answer 1

plz try Cntrl+Z to kill the thread. or below process might help if you dont care about the dependencies of thread. ps -e -T | grep myp | grep -v grep ps -e -T | grep myp | grep -v grep kill pid#