103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
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#ifndef _LINUX_TIMER_H
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#define _LINUX_TIMER_H
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#include <linux/config.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/stddef.h>
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struct tvec_t_base_s;
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struct timer_list {
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struct list_head entry;
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unsigned long expires;
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spinlock_t lock;
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unsigned long magic;
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void (*function)(unsigned long);
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unsigned long data;
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struct tvec_t_base_s *base;
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};
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#define TIMER_MAGIC 0x4b87ad6e
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#define TIMER_INITIALIZER(_function, _expires, _data) { \
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.function = (_function), \
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.expires = (_expires), \
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.data = (_data), \
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.base = NULL, \
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.magic = TIMER_MAGIC, \
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.lock = SPIN_LOCK_UNLOCKED, \
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}
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/***
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* init_timer - initialize a timer.
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* @timer: the timer to be initialized
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*
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* init_timer() must be done to a timer prior calling *any* of the
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* other timer functions.
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*/
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static inline void init_timer(struct timer_list * timer)
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{
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timer->base = NULL;
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timer->magic = TIMER_MAGIC;
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spin_lock_init(&timer->lock);
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}
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/***
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* timer_pending - is a timer pending?
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* @timer: the timer in question
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*
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* timer_pending will tell whether a given timer is currently pending,
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* or not. Callers must ensure serialization wrt. other operations done
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* to this timer, eg. interrupt contexts, or other CPUs on SMP.
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*
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* return value: 1 if the timer is pending, 0 if not.
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*/
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static inline int timer_pending(const struct timer_list * timer)
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{
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return timer->base != NULL;
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}
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extern void add_timer_on(struct timer_list *timer, int cpu);
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extern int del_timer(struct timer_list * timer);
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extern int __mod_timer(struct timer_list *timer, unsigned long expires);
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extern int mod_timer(struct timer_list *timer, unsigned long expires);
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extern unsigned long next_timer_interrupt(void);
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/***
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* add_timer - start a timer
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* @timer: the timer to be added
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*
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* The kernel will do a ->function(->data) callback from the
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* timer interrupt at the ->expired point in the future. The
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* current time is 'jiffies'.
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*
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* The timer's ->expired, ->function (and if the handler uses it, ->data)
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* fields must be set prior calling this function.
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*
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* Timers with an ->expired field in the past will be executed in the next
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* timer tick.
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*/
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static inline void add_timer(struct timer_list * timer)
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{
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__mod_timer(timer, timer->expires);
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}
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#ifdef CONFIG_SMP
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extern int del_timer_sync(struct timer_list *timer);
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extern int del_singleshot_timer_sync(struct timer_list *timer);
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#else
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# define del_timer_sync(t) del_timer(t)
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# define del_singleshot_timer_sync(t) del_timer(t)
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#endif
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extern void init_timers(void);
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extern void run_local_timers(void);
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extern void it_real_fn(unsigned long);
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#endif
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