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 void fastcall init_timer_deferrable(struct timer_list *timer); 41 42 static inline void setup_timer(struct timer_list * timer, 43 void (*function)(unsigned long), 44 unsigned long data) 45 { 46 timer->function = function; 47 timer->data = data; 48 init_timer(timer); 49 } 50 51 /** 52 * timer_pending - is a timer pending? 53 * @timer: the timer in question 54 * 55 * timer_pending will tell whether a given timer is currently pending, 56 * or not. Callers must ensure serialization wrt. other operations done 57 * to this timer, eg. interrupt contexts, or other CPUs on SMP. 58 * 59 * return value: 1 if the timer is pending, 0 if not. 60 */ 61 static inline int timer_pending(const struct timer_list * timer) 62 { 63 return timer->entry.next != NULL; 64 } 65 66 extern void add_timer_on(struct timer_list *timer, int cpu); 67 extern int del_timer(struct timer_list * timer); 68 extern int __mod_timer(struct timer_list *timer, unsigned long expires); 69 extern int mod_timer(struct timer_list *timer, unsigned long expires); 70 71 /* 72 * Return when the next timer-wheel timeout occurs (in absolute jiffies), 73 * locks the timer base: 74 */ 75 extern unsigned long next_timer_interrupt(void); 76 /* 77 * Return when the next timer-wheel timeout occurs (in absolute jiffies), 78 * locks the timer base and does the comparison against the given 79 * jiffie. 80 */ 81 extern unsigned long get_next_timer_interrupt(unsigned long now); 82 83 /* 84 * Timer-statistics info: 85 */ 86 #ifdef CONFIG_TIMER_STATS 87 88 extern void init_timer_stats(void); 89 90 extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf, 91 void *timerf, char * comm); 92 93 static inline void timer_stats_account_timer(struct timer_list *timer) 94 { 95 timer_stats_update_stats(timer, timer->start_pid, timer->start_site, 96 timer->function, timer->start_comm); 97 } 98 99 extern void __timer_stats_timer_set_start_info(struct timer_list *timer, 100 void *addr); 101 102 static inline void timer_stats_timer_set_start_info(struct timer_list *timer) 103 { 104 __timer_stats_timer_set_start_info(timer, __builtin_return_address(0)); 105 } 106 107 static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) 108 { 109 timer->start_site = NULL; 110 } 111 #else 112 static inline void init_timer_stats(void) 113 { 114 } 115 116 static inline void timer_stats_account_timer(struct timer_list *timer) 117 { 118 } 119 120 static inline void timer_stats_timer_set_start_info(struct timer_list *timer) 121 { 122 } 123 124 static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) 125 { 126 } 127 #endif 128 129 extern void delayed_work_timer_fn(unsigned long __data); 130 131 /** 132 * add_timer - start a timer 133 * @timer: the timer to be added 134 * 135 * The kernel will do a ->function(->data) callback from the 136 * timer interrupt at the ->expires point in the future. The 137 * current time is 'jiffies'. 138 * 139 * The timer's ->expires, ->function (and if the handler uses it, ->data) 140 * fields must be set prior calling this function. 141 * 142 * Timers with an ->expires field in the past will be executed in the next 143 * timer tick. 144 */ 145 static inline void add_timer(struct timer_list *timer) 146 { 147 BUG_ON(timer_pending(timer)); 148 __mod_timer(timer, timer->expires); 149 } 150 151 #ifdef CONFIG_SMP 152 extern int try_to_del_timer_sync(struct timer_list *timer); 153 extern int del_timer_sync(struct timer_list *timer); 154 #else 155 # define try_to_del_timer_sync(t) del_timer(t) 156 # define del_timer_sync(t) del_timer(t) 157 #endif 158 159 #define del_singleshot_timer_sync(t) del_timer_sync(t) 160 161 extern void init_timers(void); 162 extern void run_local_timers(void); 163 struct hrtimer; 164 extern enum hrtimer_restart it_real_fn(struct hrtimer *); 165 166 unsigned long __round_jiffies(unsigned long j, int cpu); 167 unsigned long __round_jiffies_relative(unsigned long j, int cpu); 168 unsigned long round_jiffies(unsigned long j); 169 unsigned long round_jiffies_relative(unsigned long j); 170 171 172 #endif 173