Tasklet机制（3）---exemple

#include

#include

#include

#include

#include

#include

#define INTRNO 7

static void tasklet_callback(unsigned long data)

{

        printk(KERN_ALERT "received a interrupt.\n");

}

DECLARE_TASKLET(tasklet, tasklet_callback, 0);

static irqreturn_t irq_handler(int irq, void *arg)

{

        tasklet_schedule(&tasklet);

        return IRQ_HANDLED;

}

static int __init test_init(void)

{

        int ret;

        ret = request_irq(INTRNO, irq_handler, 0, "hello", NULL);

        if (ret < 0)

                goto err;

        outb(0x10, 0x37a); /* enable parallel port interrupt */

err:

        return ret;

}

static void __exit test_exit(void)

{

        free_irq(INTRNO, NULL);

}

MODULE_LICENSE("GPL");

module_init(test_init);

module_exit(test_exit);