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#ifndef _LINUX_TIMER_H
#define _LINUX_TIMER_H
#include <linux/config.h>
#include <linux/list.h>
/*
* This is completely separate from the above, and is the
* "new and improved" way of handling timers more dynamically.
* Hopefully efficient and general enough for most things.
*
* The "hardcoded" timers above are still useful for well-
* defined problems, but the timer-list is probably better
* when you need multiple outstanding timers or similar.
*
* The "data" field is in case you want to use the same
* timeout function for several timeouts. You can use this
* to distinguish between the different invocations.
*/
struct timer_list {
struct list_head list;
unsigned long expires;
unsigned long data;
void (*function)(unsigned long);
};
extern volatile struct timer_list *running_timer;
extern void add_timer(struct timer_list * timer);
extern int del_timer(struct timer_list * timer);
/*
* mod_timer is a more efficient way to update the expire field of an
* active timer (if the timer is inactive it will be activated)
* mod_timer(a,b) is equivalent to del_timer(a); a->expires = b; add_timer(a)
*/
int mod_timer(struct timer_list *timer, unsigned long expires);
extern void it_real_fn(unsigned long);
static inline void init_timer(struct timer_list * timer)
{
timer->list.next = timer->list.prev = NULL;
}
static inline int timer_pending (const struct timer_list * timer)
{
return timer->list.next != NULL;
}
#ifdef CONFIG_SMP
#define timer_enter(t) do { running_timer = t; mb(); } while (0)
#define timer_exit() do { running_timer = NULL; } while (0)
#define timer_is_running(t) (running_timer == t)
#define timer_synchronize(t) while (timer_is_running(t)) barrier()
extern int del_timer_sync(struct timer_list * timer);
#else
#define timer_enter(t) do { } while (0)
#define timer_exit() do { } while (0)
#define timer_is_running(t) (0)
#define timer_synchronize(t) do { (void)(t); barrier(); } while(0)
#define del_timer_sync(t) del_timer(t)
#endif
/*
* These inlines deal with timer wrapping correctly. You are
* strongly encouraged to use them
* 1. Because people otherwise forget
* 2. Because if the timer wrap changes in future you wont have to
* alter your driver code.
*
* Do this with "<0" and ">=0" to only test the sign of the result. A
* good compiler would generate better code (and a really good compiler
* wouldn't care). Gcc is currently neither.
*/
#define time_after(a,b) ((long)(b) - (long)(a) < 0)
#define time_before(a,b) time_after(b,a)
#define time_after_eq(a,b) ((long)(a) - (long)(b) >= 0)
#define time_before_eq(a,b) time_after_eq(b,a)
#endif
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