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         unsigned long magic;
  16
  17         void (*function)(unsigned long);
  18         unsigned long data;
  19
  20         struct timer_base_s *base;
  21 };
  22
  23 #define TIMER_MAGIC     0x4b87ad6e
  24
  25 extern struct timer_base_s __init_timer_base;
  26
  27 #define TIMER_INITIALIZER(_function, _expires, _data) {         \
  28                 .function = (_function),                        \
  29                 .expires = (_expires),                          \
  30                 .data = (_data),                                \
  31                 .base = &__init_timer_base,                     \
  32                 .magic = TIMER_MAGIC,                           \
  33         }
  34
  35 void fastcall init_timer(struct timer_list * timer);
  36
  37 /***
  38  * timer_pending - is a timer pending?
  39  * @timer: the timer in question
  40  *
  41  * timer_pending will tell whether a given timer is currently pending,
  42  * or not. Callers must ensure serialization wrt. other operations done
  43  * to this timer, eg. interrupt contexts, or other CPUs on SMP.
  44  *
  45  * return value: 1 if the timer is pending, 0 if not.
  46  */
  47 static inline int timer_pending(const struct timer_list * timer)
  48 {
  49         return timer->entry.next != NULL;
  50 }
  51
  52 extern void add_timer_on(struct timer_list *timer, int cpu);
  53 extern int del_timer(struct timer_list * timer);
  54 extern int __mod_timer(struct timer_list *timer, unsigned long expires);
  55 extern int mod_timer(struct timer_list *timer, unsigned long expires);
  56
  57 extern unsigned long next_timer_interrupt(void);
  58
  59 /***
  60  * add_timer - start a timer
  61  * @timer: the timer to be added
  62  *
  63  * The kernel will do a ->function(->data) callback from the
  64  * timer interrupt at the ->expired point in the future. The
  65  * current time is 'jiffies'.
  66  *
  67  * The timer's ->expired, ->function (and if the handler uses it, ->data)
  68  * fields must be set prior calling this function.
  69  *
  70  * Timers with an ->expired field in the past will be executed in the next
  71  * timer tick.
  72  */
  73 static inline void add_timer(struct timer_list * timer)
  74 {
  75         __mod_timer(timer, timer->expires);
  76 }
  77
  78 #ifdef CONFIG_SMP
  79   extern int try_to_del_timer_sync(struct timer_list *timer);
  80   extern int del_timer_sync(struct timer_list *timer);
  81 #else
  82 # define try_to_del_timer_sync(t)       del_timer(t)
  83 # define del_timer_sync(t)              del_timer(t)
  84 #endif
  85
  86 #define del_singleshot_timer_sync(t) del_timer_sync(t)
  87
  88 extern void init_timers(void);
  89 extern void run_local_timers(void);
  90 extern void it_real_fn(unsigned long);
  91
  92 #endif