include/linux/timer.h

   1 #ifndef _LINUX_TIMER_H
   2 #define _LINUX_TIMER_H
   3
   4 #include <linux/list.h>
   5 #include <linux/spinlock.h>
   6 #include <linux/stddef.h>
   7
   8 struct tvec_t_base_s;
   9
  10 struct timer_list {
  11         struct list_head entry;
  12         unsigned long expires;
  13
  14         void (*function)(unsigned long);
  15         unsigned long data;
  16
  17         struct tvec_t_base_s *base;
  18 };
  19
  20 extern struct tvec_t_base_s boot_tvec_bases;
  21
  22 #define TIMER_INITIALIZER(_function, _expires, _data) {         \
  23                 .function = (_function),                        \
  24                 .expires = (_expires),                          \
  25                 .data = (_data),                                \
  26                 .base = &boot_tvec_bases,                       \
  27         }
  28
  29 #define DEFINE_TIMER(_name, _function, _expires, _data)         \
  30         struct timer_list _name =                               \
  31                 TIMER_INITIALIZER(_function, _expires, _data)
  32
  33 void fastcall init_timer(struct timer_list * timer);
  34
  35 static inline void setup_timer(struct timer_list * timer,
  36                                 void (*function)(unsigned long),
  37                                 unsigned long data)
  38 {
  39         timer->function = function;
  40         timer->data = data;
  41         init_timer(timer);
  42 }
  43
  44 /**
  45  * timer_pending - is a timer pending?
  46  * @timer: the timer in question
  47  *
  48  * timer_pending will tell whether a given timer is currently pending,
  49  * or not. Callers must ensure serialization wrt. other operations done
  50  * to this timer, eg. interrupt contexts, or other CPUs on SMP.
  51  *
  52  * return value: 1 if the timer is pending, 0 if not.
  53  */
  54 static inline int timer_pending(const struct timer_list * timer)
  55 {
  56         return timer->entry.next != NULL;
  57 }
  58
  59 extern void add_timer_on(struct timer_list *timer, int cpu);
  60 extern int del_timer(struct timer_list * timer);
  61 extern int __mod_timer(struct timer_list *timer, unsigned long expires);
  62 extern int mod_timer(struct timer_list *timer, unsigned long expires);
  63
  64 extern unsigned long next_timer_interrupt(void);
  65
  66 /**
  67  * add_timer - start a timer
  68  * @timer: the timer to be added
  69  *
  70  * The kernel will do a ->function(->data) callback from the
  71  * timer interrupt at the ->expires point in the future. The
  72  * current time is 'jiffies'.
  73  *
  74  * The timer's ->expires, ->function (and if the handler uses it, ->data)
  75  * fields must be set prior calling this function.
  76  *
  77  * Timers with an ->expires field in the past will be executed in the next
  78  * timer tick.
  79  */
  80 static inline void add_timer(struct timer_list *timer)
  81 {
  82         BUG_ON(timer_pending(timer));
  83         __mod_timer(timer, timer->expires);
  84 }
  85
  86 #ifdef CONFIG_SMP
  87   extern int try_to_del_timer_sync(struct timer_list *timer);
  88   extern int del_timer_sync(struct timer_list *timer);
  89 #else
  90 # define try_to_del_timer_sync(t)       del_timer(t)
  91 # define del_timer_sync(t)              del_timer(t)
  92 #endif
  93
  94 #define del_singleshot_timer_sync(t) del_timer_sync(t)
  95
  96 extern void init_timers(void);
  97 extern void run_local_timers(void);
  98 struct hrtimer;
  99 extern int it_real_fn(struct hrtimer *);
 100
 101 unsigned long __round_jiffies(unsigned long j, int cpu);
 102 unsigned long __round_jiffies_relative(unsigned long j, int cpu);
 103 unsigned long round_jiffies(unsigned long j);
 104 unsigned long round_jiffies_relative(unsigned long j);
 105
 106
 107 #endif