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 timer_base_s; 10 11 struct 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 25 extern 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 void fastcall init_timer(struct timer_list * timer); 36 37 /*** 38 * timer_pending - is a timer pending? 39 * @timer: the timer in question 40 * 41 * timer_pending will tell whether a given timer is currently pending, 42 * or not. Callers must ensure serialization wrt. other operations done 43 * to this timer, eg. interrupt contexts, or other CPUs on SMP. 44 * 45 * return value: 1 if the timer is pending, 0 if not. 46 */ 47 static inline int timer_pending(const struct timer_list * timer) 48 { 49 return timer->entry.next != NULL; 50 } 51 52 extern void add_timer_on(struct timer_list *timer, int cpu); 53 extern int del_timer(struct timer_list * timer); 54 extern int __mod_timer(struct timer_list *timer, unsigned long expires); 55 extern int mod_timer(struct timer_list *timer, unsigned long expires); 56 57 extern unsigned long next_timer_interrupt(void); 58 59 /*** 60 * add_timer - start a timer 61 * @timer: the timer to be added 62 * 63 * The kernel will do a ->function(->data) callback from the 64 * timer interrupt at the ->expired point in the future. The 65 * current time is 'jiffies'. 66 * 67 * The timer's ->expired, ->function (and if the handler uses it, ->data) 68 * fields must be set prior calling this function. 69 * 70 * Timers with an ->expired field in the past will be executed in the next 71 * timer tick. 72 */ 73 static inline void add_timer(struct timer_list * timer) 74 { 75 __mod_timer(timer, timer->expires); 76 } 77 78 #ifdef CONFIG_SMP 79 extern int try_to_del_timer_sync(struct timer_list *timer); 80 extern int del_timer_sync(struct timer_list *timer); 81 #else 82 # define try_to_del_timer_sync(t) del_timer(t) 83 # define del_timer_sync(t) del_timer(t) 84 #endif 85 86 #define del_singleshot_timer_sync(t) del_timer_sync(t) 87 88 extern void init_timers(void); 89 extern void run_local_timers(void); 90 extern void it_real_fn(unsigned long); 91 92 #endif 93