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