高精度定时器示例
这样设置会更好？？？
http://blog.chinaunix.net/uid-361890-id-257337.html
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| #include <linux/module.h>
#include <linux/kernel.h>
#include <linux/hrtimer.h>
#include <linux/jiffies.h>
static struct hrtimer timer;
ktime_t kt;
static enum hrtimer_restart hrtimer_handler(struct hrtimer *timer)
{
//kt = ktime_set(1, 10);
printk(" ------ I am in hrtimer -----\n");
hrtimer_forward(timer, timer->base->get_time(), kt);
return HRTIMER_RESTART;
}
static int __init test_init(void)
{
pr_info("timer resolution: %lu\n", TICK_NSEC);
kt = ktime_set(1, 10); /* 1 sec, 10 nsec */
hrtimer_init(&timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
//hrtimer_set_expires(&timer, kt);
hrtimer_start(&timer, kt, HRTIMER_MODE_REL);
timer.function = hrtimer_handler;
printk("\n-------- test start ---------\n");
return 0;
}
static void __exit test_exit(void)
{
hrtimer_cancel(&timer);
printk("-------- test over ----------\n");
return;
}
MODULE_LICENSE("GPL");
module_init(test_init);
module_exit(test_exit);
|
编译：
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| name = test.o
obj-m := $(name)
KERNELDIR := /home/tangyt/tmp/linux-2.6-cloud.p1020/
default:
make -C $(KERNELDIR) M=$(shell pwd) modules
clean:
make -C $(KERNELDIR) M=$(shell pwd) clean
|
