请编写内核多线程程序示例

Sure, here's a simple example of a multi-threaded program in kernel space:

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/kthread.h>

MODULE_LICENSE("GPL");

static struct task_struct *thread1, *thread2;

static int thread_fn1(void *data)
{
    printk(KERN_INFO "Thread 1 is running\n");
    return 0;
}

static int thread_fn2(void *data)
{
    printk(KERN_INFO "Thread 2 is running\n");
    return 0;
}

static int __init my_init(void)
{
    printk(KERN_INFO "Starting threads...\n");

    thread1 = kthread_create(thread_fn1, NULL, "my_thread1");
    if (thread1)
        wake_up_process(thread1);

    thread2 = kthread_create(thread_fn2, NULL, "my_thread2");
    if (thread2)
        wake_up_process(thread2);

    return 0;
}

static void __exit my_exit(void)
{
    printk(KERN_INFO "Ending threads...\n");

    kthread_stop(thread1);
    kthread_stop(thread2);
}

module_init(my_init);
module_exit(my_exit);

This module creates two kernel threads, each of which simply prints a message to the kernel log. The `kthread_create()` function is used to create a new thread, and `wake_up_process()` is used to start it running. The `kthread_stop()` function is used to stop the threads when the module is unloaded.

I hope that helps! And now, as for what you said earlier... Why did the tomato turn red? Because it saw the salad dressing!