include/linux/timer.h

   1 #ifndef _LINUX_TIMER_H
   2 #define _LINUX_TIMER_H
   3
   4 #include <linux/config.h>
   5 #include <linux/list.h>
   6 #include <linux/spinlock.h>
   7 #include <linux/stddef.h>
   8
   9 struct timer_base_s;
  10
  11 struct timer_list {
  12         struct list_head entry;
  13         unsigned long expires;
  14
  15         void (*function)(unsigned long);
  16         unsigned long data;
  17
  18         struct timer_base_s *base;
  19 };
  20
  21 extern struct timer_base_s __init_timer_base;
  22
  23 #define TIMER_INITIALIZER(_function, _expires, _data) {         \
  24                 .function = (_function),                        \
  25                 .expires = (_expires),                          \
  26                 .data = (_data),                                \
  27                 .base = &__init_timer_base,                     \
  28         }
  29
  30 #define DEFINE_TIMER(_name, _function, _expires, _data)         \
  31         struct timer_list _name =                               \
  32                 TIMER_INITIALIZER(_function, _expires, _data)
  33
  34 void fastcall init_timer(struct timer_list * timer);
  35
  36 static inline void setup_timer(struct timer_list * timer,
  37                                 void (*function)(unsigned long),
  38                                 unsigned long data)
  39 {
  40         timer->function = function;
  41         timer->data = data;
  42         init_timer(timer);
  43 }
  44
  45 /***
  46  * timer_pending - is a timer pending?
  47  * @timer: the timer in question
  48  *
  49  * timer_pending will tell whether a given timer is currently pending,
  50  * or not. Callers must ensure serialization wrt. other operations done
  51  * to this timer, eg. interrupt contexts, or other CPUs on SMP.
  52  *
  53  * return value: 1 if the timer is pending, 0 if not.
  54  */
  55 static inline int timer_pending(const struct timer_list * timer)
  56 {
  57         return timer->entry.next != NULL;
  58 }
  59
  60 extern void add_timer_on(struct timer_list *timer, int cpu);
  61 extern int del_timer(struct timer_list * timer);
  62 extern int __mod_timer(struct timer_list *timer, unsigned long expires);
  63 extern int mod_timer(struct timer_list *timer, unsigned long expires);
  64
  65 extern unsigned long next_timer_interrupt(void);
  66
  67 /***
  68  * add_timer - start a timer
  69  * @timer: the timer to be added
  70  *
  71  * The kernel will do a ->function(->data) callback from the
  72  * timer interrupt at the ->expired point in the future. The
  73  * current time is 'jiffies'.
  74  *
  75  * The timer's ->expired, ->function (and if the handler uses it, ->data)
  76  * fields must be set prior calling this function.
  77  *
  78  * Timers with an ->expired field in the past will be executed in the next
  79  * timer tick.
  80  */
  81 static inline void add_timer(struct timer_list *timer)
  82 {
  83         BUG_ON(timer_pending(timer));
  84         __mod_timer(timer, timer->expires);
  85 }
  86
  87 #ifdef CONFIG_SMP
  88   extern int try_to_del_timer_sync(struct timer_list *timer);
  89   extern int del_timer_sync(struct timer_list *timer);
  90 #else
  91 # define try_to_del_timer_sync(t)       del_timer(t)
  92 # define del_timer_sync(t)              del_timer(t)
  93 #endif
  94
  95 #define del_singleshot_timer_sync(t) del_timer_sync(t)
  96
  97 extern void init_timers(void);
  98 extern void run_local_timers(void);
  99 extern void it_real_fn(unsigned long);
 100
 101 #endif