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 #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 /*** 42 * timer_pending - is a timer pending? 43 * @timer: the timer in question 44 * 45 * timer_pending will tell whether a given timer is currently pending, 46 * or not. Callers must ensure serialization wrt. other operations done 47 * to this timer, eg. interrupt contexts, or other CPUs on SMP. 48 * 49 * return value: 1 if the timer is pending, 0 if not. 50 */ 51 static inline int timer_pending(const struct timer_list * timer) 52 { 53 return timer->entry.next != NULL; 54 } 55 56 extern void add_timer_on(struct timer_list *timer, int cpu); 57 extern int del_timer(struct timer_list * timer); 58 extern int __mod_timer(struct timer_list *timer, unsigned long expires); 59 extern int mod_timer(struct timer_list *timer, unsigned long expires); 60 61 extern unsigned long next_timer_interrupt(void); 62 63 /*** 64 * add_timer - start a timer 65 * @timer: the timer to be added 66 * 67 * The kernel will do a ->function(->data) callback from the 68 * timer interrupt at the ->expired point in the future. The 69 * current time is 'jiffies'. 70 * 71 * The timer's ->expired, ->function (and if the handler uses it, ->data) 72 * fields must be set prior calling this function. 73 * 74 * Timers with an ->expired field in the past will be executed in the next 75 * timer tick. 76 */ 77 static inline void add_timer(struct timer_list * timer) 78 { 79 __mod_timer(timer, timer->expires); 80 } 81 82 #ifdef CONFIG_SMP 83 extern int try_to_del_timer_sync(struct timer_list *timer); 84 extern int del_timer_sync(struct timer_list *timer); 85 #else 86 # define try_to_del_timer_sync(t) del_timer(t) 87 # define del_timer_sync(t) del_timer(t) 88 #endif 89 90 #define del_singleshot_timer_sync(t) del_timer_sync(t) 91 92 extern void init_timers(void); 93 extern void run_local_timers(void); 94 extern void it_real_fn(unsigned long); 95 96 #endif 97