Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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 timer_base_s;
10
11struct timer_list {
12 struct list_head entry;
13 unsigned long expires;
14
15 void (*function)(unsigned long);
16 unsigned long data;
17
18 struct timer_base_s *base;
19};
20
21extern struct timer_base_s __init_timer_base;
22
23#define TIMER_INITIALIZER(_function, _expires, _data) { \
24 .function = (_function), \
25 .expires = (_expires), \
26 .data = (_data), \
27 .base = &__init_timer_base, \
28 }
29
30#define DEFINE_TIMER(_name, _function, _expires, _data) \
31 struct timer_list _name = \
32 TIMER_INITIALIZER(_function, _expires, _data)
33
34void fastcall init_timer(struct timer_list * timer);
35
36static 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 */
55static inline int timer_pending(const struct timer_list * timer)
56{
57 return timer->entry.next != NULL;
58}
59
60extern void add_timer_on(struct timer_list *timer, int cpu);
61extern int del_timer(struct timer_list * timer);
62extern int __mod_timer(struct timer_list *timer, unsigned long expires);
63extern int mod_timer(struct timer_list *timer, unsigned long expires);
64
65extern 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 ->expired point in the future. The
73 * current time is 'jiffies'.
74 *
75 * The timer's ->expired, ->function (and if the handler uses it, ->data)
76 * fields must be set prior calling this function.
77 *
78 * Timers with an ->expired field in the past will be executed in the next
79 * timer tick.
80 */
81static 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
97extern void init_timers(void);
98extern void run_local_timers(void);
99extern int it_real_fn(void *);
100
101#endif