[linux-block.git] / include / linux / timer.h

#ifndef _LINUX_TIMER_H
#define _LINUX_TIMER_H

#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>

struct tvec_t_base_s;

struct timer_list {
	struct list_head entry;
	unsigned long expires;

	void (*function)(unsigned long);
	unsigned long data;

	struct tvec_t_base_s *base;
};

extern struct tvec_t_base_s boot_tvec_bases;

#define TIMER_INITIALIZER(_function, _expires, _data) {		\
		.function = (_function),			\
		.expires = (_expires),				\
		.data = (_data),				\
		.base = &boot_tvec_bases,			\
	}

#define DEFINE_TIMER(_name, _function, _expires, _data)		\
	struct timer_list _name =				\
		TIMER_INITIALIZER(_function, _expires, _data)

void fastcall init_timer(struct timer_list * timer);

static inline void setup_timer(struct timer_list * timer,
				void (*function)(unsigned long),
				unsigned long data)
{
	timer->function = function;
	timer->data = data;
	init_timer(timer);
}

/***
 * timer_pending - is a timer pending?
 * @timer: the timer in question
 *
 * timer_pending will tell whether a given timer is currently pending,
 * or not. Callers must ensure serialization wrt. other operations done
 * to this timer, eg. interrupt contexts, or other CPUs on SMP.
 *
 * return value: 1 if the timer is pending, 0 if not.
 */
static inline int timer_pending(const struct timer_list * timer)
{
	return timer->entry.next != NULL;
}

extern void add_timer_on(struct timer_list *timer, int cpu);
extern int del_timer(struct timer_list * timer);
extern int __mod_timer(struct timer_list *timer, unsigned long expires);
extern int mod_timer(struct timer_list *timer, unsigned long expires);

extern unsigned long next_timer_interrupt(void);

/***
 * add_timer - start a timer
 * @timer: the timer to be added
 *
 * The kernel will do a ->function(->data) callback from the
 * timer interrupt at the ->expires point in the future. The
 * current time is 'jiffies'.
 *
 * The timer's ->expires, ->function (and if the handler uses it, ->data)
 * fields must be set prior calling this function.
 *
 * Timers with an ->expires field in the past will be executed in the next
 * timer tick.
 */
static inline void add_timer(struct timer_list *timer)
{
	BUG_ON(timer_pending(timer));
	__mod_timer(timer, timer->expires);
}

#ifdef CONFIG_SMP
  extern int try_to_del_timer_sync(struct timer_list *timer);
  extern int del_timer_sync(struct timer_list *timer);
#else
# define try_to_del_timer_sync(t)	del_timer(t)
# define del_timer_sync(t)		del_timer(t)
#endif

#define del_singleshot_timer_sync(t) del_timer_sync(t)

extern void init_timers(void);
extern void run_local_timers(void);
struct hrtimer;
extern int it_real_fn(struct hrtimer *);

#endif
Commit	Line	Data
	1	#ifndef _LINUX_TIMER_H
	2	#define _LINUX_TIMER_H
	3
	4	#include <linux/list.h>
	5	#include <linux/spinlock.h>
	6	#include <linux/stddef.h>
	7
	8	struct tvec_t_base_s;
	9
	10	struct timer_list {
	11	struct list_head entry;
	12	unsigned long expires;
	13
	14	void (*function)(unsigned long);
	15	unsigned long data;
	16
	17	struct tvec_t_base_s *base;
	18	};
	19
	20	extern struct tvec_t_base_s boot_tvec_bases;
	21
	22	#define TIMER_INITIALIZER(_function, _expires, _data) { \
	23	.function = (_function), \
	24	.expires = (_expires), \
	25	.data = (_data), \
	26	.base = &boot_tvec_bases, \
	27	}
	28
	29	#define DEFINE_TIMER(_name, _function, _expires, _data) \
	30	struct timer_list _name = \
	31	TIMER_INITIALIZER(_function, _expires, _data)
	32
	33	void fastcall init_timer(struct timer_list * timer);
	34
	35	static inline void setup_timer(struct timer_list * timer,
	36	void (*function)(unsigned long),
	37	unsigned long data)
	38	{
	39	timer->function = function;
	40	timer->data = data;
	41	init_timer(timer);
	42	}
	43
	44	/***
	45	* timer_pending - is a timer pending?
	46	* @timer: the timer in question
	47	*
	48	* timer_pending will tell whether a given timer is currently pending,
	49	* or not. Callers must ensure serialization wrt. other operations done
	50	* to this timer, eg. interrupt contexts, or other CPUs on SMP.
	51	*
	52	* return value: 1 if the timer is pending, 0 if not.
	53	*/
	54	static inline int timer_pending(const struct timer_list * timer)
	55	{
	56	return timer->entry.next != NULL;
	57	}
	58
	59	extern void add_timer_on(struct timer_list *timer, int cpu);
	60	extern int del_timer(struct timer_list * timer);
	61	extern int __mod_timer(struct timer_list *timer, unsigned long expires);
	62	extern int mod_timer(struct timer_list *timer, unsigned long expires);
	63
	64	extern unsigned long next_timer_interrupt(void);
	65
	66	/***
	67	* add_timer - start a timer
	68	* @timer: the timer to be added
	69	*
	70	* The kernel will do a ->function(->data) callback from the
	71	* timer interrupt at the ->expires point in the future. The
	72	* current time is 'jiffies'.
	73	*
	74	* The timer's ->expires, ->function (and if the handler uses it, ->data)
	75	* fields must be set prior calling this function.
	76	*
	77	* Timers with an ->expires field in the past will be executed in the next
	78	* timer tick.
	79	*/
	80	static inline void add_timer(struct timer_list *timer)
	81	{
	82	BUG_ON(timer_pending(timer));
	83	__mod_timer(timer, timer->expires);
	84	}
	85
	86	#ifdef CONFIG_SMP
	87	extern int try_to_del_timer_sync(struct timer_list *timer);
	88	extern int del_timer_sync(struct timer_list *timer);
	89	#else
	90	# define try_to_del_timer_sync(t) del_timer(t)
	91	# define del_timer_sync(t) del_timer(t)
	92	#endif
	93
	94	#define del_singleshot_timer_sync(t) del_timer_sync(t)
	95
	96	extern void init_timers(void);
	97	extern void run_local_timers(void);
	98	struct hrtimer;
	99	extern int it_real_fn(struct hrtimer *);
	100
	101	#endif