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 tvec_t_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 tvec_t_base_s *base;
19 };
20
21 extern struct tvec_t_base_s boot_tvec_bases;
22
23 #define TIMER_INITIALIZER(_function, _expires, _data) { \
24 .function = (_function), \
25 .expires = (_expires), \
26 .data = (_data), \
27 .base = &boot_tvec_bases, \
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 ->expires point in the future. The
73 * current time is 'jiffies'.
74 *
75 * The timer's ->expires, ->function (and if the handler uses it, ->data)
76 * fields must be set prior calling this function.
77 *
78 * Timers with an ->expires 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 struct hrtimer;
100 extern int it_real_fn(struct hrtimer *);
101
102 #endif
103
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