linux核心鏈表的使用例子

 

linux核心鏈表的使用例子

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/list.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("wzt");

typedef struct list_test_struct {
        int count;
        struct list_head list;
}node;

struct list_head head_list;
rwlock_t list_lock = RW_LOCK_UNLOCKED;

void creat_list(void)
{
        node *s = NULL;
        int i = 0;

        for (i = 0; i < 10; i++) {
                s = (node *)kmalloc(sizeof(node), GFP_ATOMIC);
                if (!s)
                        return ;

                s->count = i;

                write_lock(&list_lock);
                list_add_tail(&(s->list), &head_list);
                write_unlock(&list_lock);
        }
}

void del_data(void)
{
        node *s;
        struct list_head *p;

        write_lock(&list_lock);
        list_for_each(p, &head_list) {
                s = list_entry(p, node, list);
                if (s->count == 5) {
                        list_del(p);
                        write_unlock(&list_lock);
                        return ;
                }
        }
        write_unlock(&list_lock);
}

void print_list(void)
{
        node *s;
        struct list_head *p;

        read_lock(&list_lock);
        list_for_each(p, &head_list) {
                s = list_entry(p, node, list);
                printk("%d,", s->count);
        }
        write_lock(&list_lock);
}

int list_test_init(void)
{
        INIT_LIST_HEAD(&head_list);

        creat_list();
        print_list();

        del_data();
        print_list();

        return 0;
}

void list_test_exit(void)
{
}

module_init(list_test_init);
module_exit(list_test_exit);