Linux 0.12ÄÚºË
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static struct timer_list {
long jiffies;
void (*fn)();
struct timer_list * next;
} timer_list[TIME_REQUESTS], * next_timer = NULL; /* next_timer Ϊ¶ÓÁÐÍ·Ö¸Õë*/
void add_timer(long jiffies, void (*fn)(void))
{
struct timer_list * p;
if (!fn)
return;
cli();
if (jiffies <= 0)
(fn)();
else {
for (p = timer_list ; p < timer_list + TIME_REQUESTS ; p++)
if (!p->fn)
break;
if (p >= timer_list + TIME_REQUESTS)
panic("No more time requests free");
p->fn = fn;
p->jiffies = jiffies;
p->next = next_timer;
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#include<stdio.h> //C﵀I/O
void main()
{
time_t now; //ʵÀý»¯time_t½á¹¹
struct tm *timenow; //ʵÀý»¯tm½á¹¹Ö¸Õë
time(&now);
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Device Drivers--->
character devices--->
Serial drivers--->
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