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 9 struct tvec_t_base_s; 10 11 struct timer_list { 12 struct list_head entry; 13 unsigned long expires; 14 15 spinlock_t lock; 16 unsigned long magic; 17 18 void (*function)(unsigned long); 19 unsigned long data; 20 21 struct tvec_t_base_s *base; 22 }; 23 24 #define TIMER_MAGIC 0x4b87ad6e 25 26 #define TIMER_INITIALIZER(_function, _expires, _data) { \ 27 .function = (_function), \ 28 .expires = (_expires), \ 29 .data = (_data), \ 30 .base = NULL, \ 31 .magic = TIMER_MAGIC, \ 32 .lock = SPIN_LOCK_UNLOCKED, \ 33 } 34 35 /*** 36 * init_timer - initialize a timer. 37 * @timer: the timer to be initialized 38 * 39 * init_timer() must be done to a timer prior calling *any* of the 40 * other timer functions. 41 */ 42 static inline void init_timer(struct timer_list * timer) 43 { 44 timer->base = NULL; 45 timer->magic = TIMER_MAGIC; 46 spin_lock_init(&timer->lock); 47 } 48 49 /*** 50 * timer_pending - is a timer pending? 51 * @timer: the timer in question 52 * 53 * timer_pending will tell whether a given timer is currently pending, 54 * or not. Callers must ensure serialization wrt. other operations done 55 * to this timer, eg. interrupt contexts, or other CPUs on SMP. 56 * 57 * return value: 1 if the timer is pending, 0 if not. 58 */ 59 static inline int timer_pending(const struct timer_list * timer) 60 { 61 return timer->base != NULL; 62 } 63 64 extern void add_timer_on(struct timer_list *timer, int cpu); 65 extern int del_timer(struct timer_list * timer); 66 extern int __mod_timer(struct timer_list *timer, unsigned long expires); 67 extern int mod_timer(struct timer_list *timer, unsigned long expires); 68 69 extern unsigned long next_timer_interrupt(void); 70 71 /*** 72 * add_timer - start a timer 73 * @timer: the timer to be added 74 * 75 * The kernel will do a ->function(->data) callback from the 76 * timer interrupt at the ->expired point in the future. The 77 * current time is 'jiffies'. 78 * 79 * The timer's ->expired, ->function (and if the handler uses it, ->data) 80 * fields must be set prior calling this function. 81 * 82 * Timers with an ->expired field in the past will be executed in the next 83 * timer tick. 84 */ 85 static inline void add_timer(struct timer_list * timer) 86 { 87 __mod_timer(timer, timer->expires); 88 } 89 90 #ifdef CONFIG_SMP 91 extern int del_timer_sync(struct timer_list *timer); 92 extern int del_singleshot_timer_sync(struct timer_list *timer); 93 #else 94 # define del_timer_sync(t) del_timer(t) 95 # define del_singleshot_timer_sync(t) del_timer(t) 96 #endif 97 98 extern void init_timers(void); 99 extern void run_local_timers(void); 100 extern void it_real_fn(unsigned long); 101 102 #endif 103