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 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 #ifdef CONFIG_TIMER_STATS 20 void *start_site; 21 char start_comm[16]; 22 int start_pid; 23 #endif 24 }; 25 26 extern 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 39 void fastcall init_timer(struct timer_list * timer); 40 41 static 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 */ 60 static inline int timer_pending(const struct timer_list * timer) 61 { 62 return timer->entry.next != NULL; 63 } 64 65 extern void add_timer_on(struct timer_list *timer, int cpu); 66 extern int del_timer(struct timer_list * timer); 67 extern int __mod_timer(struct timer_list *timer, unsigned long expires); 68 extern 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 */ 74 extern 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 */ 80 extern unsigned long get_next_timer_interrupt(unsigned long now); 81 82 /* 83 * Timer-statistics info: 84 */ 85 #ifdef CONFIG_TIMER_STATS 86 87 extern void init_timer_stats(void); 88 89 extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf, 90 void *timerf, char * comm); 91 92 static 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 98 extern void __timer_stats_timer_set_start_info(struct timer_list *timer, 99 void *addr); 100 101 static 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 } 105 106 static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) 107 { 108 timer->start_site = NULL; 109 } 110 #else 111 static inline void init_timer_stats(void) 112 { 113 } 114 115 static inline void timer_stats_account_timer(struct timer_list *timer) 116 { 117 } 118 119 static inline void timer_stats_timer_set_start_info(struct timer_list *timer) 120 { 121 } 122 123 static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) 124 { 125 } 126 #endif 127 128 extern 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 */ 144 static 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) 159 160 extern void init_timers(void); 161 extern void run_local_timers(void); 162 struct hrtimer; 163 extern enum hrtimer_restart it_real_fn(struct hrtimer *); 164 165 unsigned long __round_jiffies(unsigned long j, int cpu); 166 unsigned long __round_jiffies_relative(unsigned long j, int cpu); 167 unsigned long round_jiffies(unsigned long j); 168 unsigned long round_jiffies_relative(unsigned long j); 169 170 171 #endif 172