int request_irq(unsigned int irq,
void (*handler)(int irq, void *dev_id, struct pt_regs *regs),
unsigned long irqflags,
const char * devname,
void *dev_id);

void free_irq(unsigned int irq,void *dev_id);

void my_tasklet_func(unsigned long); //定義一個(gè)處理函數(shù)：
DECLARE_TASKLET(my_tasklet,my_tasklet_func,data); //定義一個(gè)tasklet結(jié)構(gòu)my_tasklet，與
my_tasklet_func(data)函數(shù)相關(guān)聯(lián)

tasklet_schedule(&my_tasklet);

DECLARE_TASKLET_DISABLED(name,function,data); //與DECLARE_TASKLET類似，但等待tasklet被使能
tasklet_enable(struct tasklet_struct *); //使能tasklet 
tasklet_disble(struct tasklet_struct *); //禁用tasklet 
tasklet_init(struct tasklet_struct *,void (*func)(unsigned long),unsigned long); //類似
DECLARE_TASKLET() 
tasklet_kill(struct tasklet_struct *); // 清除指定tasklet的可調(diào)度位，即不允許調(diào)度該tasklet

#include 
… 
//定義與綁定tasklet函數(shù)
void test_tasklet_action(unsigned long t);
DECLARE_TASKLET(test_tasklet, test_tasklet_action, 0);

void test_tasklet_action(unsigned long t)
{
　printk("tasklet is executing\n");
}

…

ssize_t globalvar_write(struct file *filp, const char *buf, size_t len, loff_t *off)
{
　…
　if (copy_from_user(&global_var, buf, sizeof(int)))
　{
return - EFAULT;
　}

　//調(diào)度tasklet執(zhí)行
　tasklet_schedule(&test_tasklet);
　return sizeof(int);
}

static struct fasync_struct *rtc_async_queue;
static int __init rtc_init(void)
{
　misc_register(&rtc_dev);
　create_proc_read_entry("driver/rtc", 0, 0, rtc_read_proc, NULL);

　#if RTC_IRQ
if (rtc_has_irq == 0)
　goto no_irq2;

init_timer(&rtc_irq_timer);
rtc_irq_timer.function = rtc_dropped_irq;
spin_lock_irq(&rtc_lock);
/* Initialize periodic freq. to CMOS reset default, which is 1024Hz */
CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) &0xF0) | 0x06), RTC_FREQ_SELECT);
spin_unlock_irq(&rtc_lock);
rtc_freq = 1024;
no_irq2:
　#endif

　printk(KERN_INFO "Real Time Clock Driver v" RTC_VERSION "\n");
　return 0;
}

static void __exit rtc_exit(void)
{
　remove_proc_entry("driver/rtc", NULL);
　misc_deregister(&rtc_dev);

　release_region(RTC_PORT(0), RTC_IO_EXTENT);
　if (rtc_has_irq)
free_irq(RTC_IRQ, NULL);
}
static void rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
　/*
　* Can be an alarm interrupt, update complete interrupt,
　* or a periodic interrupt. We store the status in the
　* low byte and the number of interrupts received since
　* the last read in the r emainder of rtc_irq_data.
　*/

　spin_lock(&rtc_lock);
　rtc_irq_data += 0x100;
　rtc_irq_data &= ~0xff;
　rtc_irq_data |= (CMOS_READ(RTC_INTR_FLAGS) &0xF0);

　if (rtc_status &RTC_TIMER_ON)
mod_timer(&rtc_irq_timer, jiffies + HZ / rtc_freq + 2 * HZ / 100);

　spin_unlock(&rtc_lock);

　/* Now do the rest of the actions */
　wake_up_interruptible(&rtc_wait);

　kill_fasync(&rtc_async_queue, SIGIO, POLL_IN);
}

static int rtc_fasync (int fd, struct file *filp, int on)
{
　return fasync_helper (fd, filp, on, &rtc_async_queue);
}

static void rtc_dropped_irq(unsigned long data)
{
　unsigned long freq;

　spin_lock_irq(&rtc_lock);

　/* Just in case someone disabled the timer from behind our back... */
　if (rtc_status &RTC_TIMER_ON)
mod_timer(&rtc_irq_timer, jiffies + HZ / rtc_freq + 2 * HZ / 100);

　rtc_irq_data += ((rtc_freq / HZ) << 8);
　rtc_irq_data &= ~0xff;
　rtc_irq_data |= (CMOS_READ(RTC_INTR_FLAGS) &0xF0); /* restart */

　freq = rtc_freq;

　spin_unlock_irq(&rtc_lock);
　printk(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n", freq);

　/* Now we have new data */
　wake_up_interruptible(&rtc_wait);

　kill_fasync(&rtc_async_queue, SIGIO, POLL_IN);
}