Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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
35#define DEFINE_TIMER(_name, _function, _expires, _data) \
36 struct timer_list _name = \
37 TIMER_INITIALIZER(_function, _expires, _data)
38
39void fastcall init_timer(struct timer_list * timer);
40
41/***
42 * timer_pending - is a timer pending?
43 * @timer: the timer in question
44 *
45 * timer_pending will tell whether a given timer is currently pending,
46 * or not. Callers must ensure serialization wrt. other operations done
47 * to this timer, eg. interrupt contexts, or other CPUs on SMP.
48 *
49 * return value: 1 if the timer is pending, 0 if not.
50 */
51static inline int timer_pending(const struct timer_list * timer)
52{
53 return timer->entry.next != NULL;
54}
55
56extern void add_timer_on(struct timer_list *timer, int cpu);
57extern int del_timer(struct timer_list * timer);
58extern int __mod_timer(struct timer_list *timer, unsigned long expires);
59extern int mod_timer(struct timer_list *timer, unsigned long expires);
60
61extern unsigned long next_timer_interrupt(void);
62
63/***
64 * add_timer - start a timer
65 * @timer: the timer to be added
66 *
67 * The kernel will do a ->function(->data) callback from the
68 * timer interrupt at the ->expired point in the future. The
69 * current time is 'jiffies'.
70 *
71 * The timer's ->expired, ->function (and if the handler uses it, ->data)
72 * fields must be set prior calling this function.
73 *
74 * Timers with an ->expired field in the past will be executed in the next
75 * timer tick.
76 */
77static inline void add_timer(struct timer_list * timer)
78{
79 __mod_timer(timer, timer->expires);
80}
81
82#ifdef CONFIG_SMP
83 extern int try_to_del_timer_sync(struct timer_list *timer);
84 extern int del_timer_sync(struct timer_list *timer);
85#else
86# define try_to_del_timer_sync(t) del_timer(t)
87# define del_timer_sync(t) del_timer(t)
88#endif
89
90#define del_singleshot_timer_sync(t) del_timer_sync(t)
91
92extern void init_timers(void);
93extern void run_local_timers(void);
94extern void it_real_fn(unsigned long);
95
96#endif