LXR linux-bk/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
   9struct tvec_t_base_s;
  10
  11struct timer_list {
  12        struct list_head entry;
  13        unsigned long expires;
  14
  15        spinlock_t lock;
  16        unsigned long magic;
  17
  18        void (*function)(unsigned long);
  19        unsigned long data;
  20
  21        struct tvec_t_base_s *base;
  22};
  23
  24#define TIMER_MAGIC     0x4b87ad6e
  25
  26#define TIMER_INITIALIZER(_function, _expires, _data) {         \
  27                .function = (_function),                        \
  28                .expires = (_expires),                          \
  29                .data = (_data),                                \
  30                .base = NULL,                                   \
  31                .magic = TIMER_MAGIC,                           \
  32                .lock = SPIN_LOCK_UNLOCKED,                     \
  33        }
  34
  35/***
  36 * init_timer - initialize a timer.
  37 * @timer: the timer to be initialized
  38 *
  39 * init_timer() must be done to a timer prior calling *any* of the
  40 * other timer functions.
  41 */
  42static inline void init_timer(struct timer_list * timer)
  43{
  44        timer->base = NULL;
  45        timer->magic = TIMER_MAGIC;
  46        spin_lock_init(&timer->lock);
  47}
  48
  49/***
  50 * timer_pending - is a timer pending?
  51 * @timer: the timer in question
  52 *
  53 * timer_pending will tell whether a given timer is currently pending,
  54 * or not. Callers must ensure serialization wrt. other operations done
  55 * to this timer, eg. interrupt contexts, or other CPUs on SMP.
  56 *
  57 * return value: 1 if the timer is pending, 0 if not.
  58 */
  59static inline int timer_pending(const struct timer_list * timer)
  60{
  61        return timer->base != NULL;
  62}
  63
  64extern void add_timer_on(struct timer_list *timer, int cpu);
  65extern int del_timer(struct timer_list * timer);
  66extern int __mod_timer(struct timer_list *timer, unsigned long expires);
  67extern int mod_timer(struct timer_list *timer, unsigned long expires);
  68
  69extern unsigned long next_timer_interrupt(void);
  70
  71/***
  72 * add_timer - start a timer
  73 * @timer: the timer to be added
  74 *
  75 * The kernel will do a ->function(->data) callback from the
  76 * timer interrupt at the ->expired point in the future. The
  77 * current time is 'jiffies'.
  78 *
  79 * The timer's ->expired, ->function (and if the handler uses it, ->data)
  80 * fields must be set prior calling this function.
  81 *
  82 * Timers with an ->expired field in the past will be executed in the next
  83 * timer tick.
  84 */
  85static inline void add_timer(struct timer_list * timer)
  86{
  87        __mod_timer(timer, timer->expires);
  88}
  89
  90#ifdef CONFIG_SMP
  91  extern int del_timer_sync(struct timer_list *timer);
  92  extern int del_singleshot_timer_sync(struct timer_list *timer);
  93#else
  94# define del_timer_sync(t) del_timer(t)
  95# define del_singleshot_timer_sync(t) del_timer(t)
  96#endif
  97
  98extern void init_timers(void);
  99extern void run_local_timers(void);
 100extern void it_real_fn(unsigned long);
 101
 102#endif
 103