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
setup_timer(struct timer_list * timer,void (* function)(unsigned long),unsigned long data)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 */
timer_pending(const struct timer_list * timer)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 */
add_timer(struct timer_list * timer)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 #endif
102