Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1#ifndef _LINUX_TIMER_H
2#define _LINUX_TIMER_H
3
4#include <linux/list.h>
5#include <linux/ktime.h>
6#include <linux/spinlock.h>
7#include <linux/stddef.h>
8
9struct tvec_t_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 tvec_t_base_s *base;
19#ifdef CONFIG_TIMER_STATS
20 void *start_site;
21 char start_comm[16];
22 int start_pid;
23#endif
24};
25
26extern struct tvec_t_base_s boot_tvec_bases;
27
28#define TIMER_INITIALIZER(_function, _expires, _data) { \
29 .function = (_function), \
30 .expires = (_expires), \
31 .data = (_data), \
32 .base = &boot_tvec_bases, \
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
41static inline void setup_timer(struct timer_list * timer,
42 void (*function)(unsigned long),
43 unsigned long data)
44{
45 timer->function = function;
46 timer->data = data;
47 init_timer(timer);
48}
49
50/**
51 * timer_pending - is a timer pending?
52 * @timer: the timer in question
53 *
54 * timer_pending will tell whether a given timer is currently pending,
55 * or not. Callers must ensure serialization wrt. other operations done
56 * to this timer, eg. interrupt contexts, or other CPUs on SMP.
57 *
58 * return value: 1 if the timer is pending, 0 if not.
59 */
60static inline int timer_pending(const struct timer_list * timer)
61{
62 return timer->entry.next != NULL;
63}
64
65extern void add_timer_on(struct timer_list *timer, int cpu);
66extern int del_timer(struct timer_list * timer);
67extern int __mod_timer(struct timer_list *timer, unsigned long expires);
68extern int mod_timer(struct timer_list *timer, unsigned long expires);
69
70/*
71 * Return when the next timer-wheel timeout occurs (in absolute jiffies),
72 * locks the timer base:
73 */
74extern unsigned long next_timer_interrupt(void);
75/*
76 * Return when the next timer-wheel timeout occurs (in absolute jiffies),
77 * locks the timer base and does the comparison against the given
78 * jiffie.
79 */
80extern unsigned long get_next_timer_interrupt(unsigned long now);
81
82/*
83 * Timer-statistics info:
84 */
85#ifdef CONFIG_TIMER_STATS
86
87extern void init_timer_stats(void);
88
89extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
90 void *timerf, char * comm);
91
92static inline void timer_stats_account_timer(struct timer_list *timer)
93{
94 timer_stats_update_stats(timer, timer->start_pid, timer->start_site,
95 timer->function, timer->start_comm);
96}
97
98extern void __timer_stats_timer_set_start_info(struct timer_list *timer,
99 void *addr);
100
101static inline void timer_stats_timer_set_start_info(struct timer_list *timer)
102{
103 __timer_stats_timer_set_start_info(timer, __builtin_return_address(0));
104}
105
106static inline void timer_stats_timer_clear_start_info(struct timer_list *timer)
107{
108 timer->start_site = NULL;
109}
110#else
111static inline void init_timer_stats(void)
112{
113}
114
115static inline void timer_stats_account_timer(struct timer_list *timer)
116{
117}
118
119static inline void timer_stats_timer_set_start_info(struct timer_list *timer)
120{
121}
122
123static inline void timer_stats_timer_clear_start_info(struct timer_list *timer)
124{
125}
126#endif
127
128extern void delayed_work_timer_fn(unsigned long __data);
129
130/**
131 * add_timer - start a timer
132 * @timer: the timer to be added
133 *
134 * The kernel will do a ->function(->data) callback from the
135 * timer interrupt at the ->expires point in the future. The
136 * current time is 'jiffies'.
137 *
138 * The timer's ->expires, ->function (and if the handler uses it, ->data)
139 * fields must be set prior calling this function.
140 *
141 * Timers with an ->expires field in the past will be executed in the next
142 * timer tick.
143 */
144static inline void add_timer(struct timer_list *timer)
145{
146 BUG_ON(timer_pending(timer));
147 __mod_timer(timer, timer->expires);
148}
149
150#ifdef CONFIG_SMP
151 extern int try_to_del_timer_sync(struct timer_list *timer);
152 extern int del_timer_sync(struct timer_list *timer);
153#else
154# define try_to_del_timer_sync(t) del_timer(t)
155# define del_timer_sync(t) del_timer(t)
156#endif
157
158#define del_singleshot_timer_sync(t) del_timer_sync(t)
159
160extern void init_timers(void);
161extern void run_local_timers(void);
162struct hrtimer;
163extern enum hrtimer_restart it_real_fn(struct hrtimer *);
164
165unsigned long __round_jiffies(unsigned long j, int cpu);
166unsigned long __round_jiffies_relative(unsigned long j, int cpu);
167unsigned long round_jiffies(unsigned long j);
168unsigned long round_jiffies_relative(unsigned long j);
169
170
171#endif