| #ifndef _LINUX_TIMER_H |
| #define _LINUX_TIMER_H |
| |
| #include <linux/config.h> |
| #include <linux/list.h> |
| |
| /* |
| * In Linux 2.4, static timers have been removed from the kernel. |
| * Timers may be dynamically created and destroyed, and should be initialized |
| * by a call to init_timer() upon creation. |
| * |
| * The "data" field enables use of a common timeout function for several |
| * timeouts. You can use this field to distinguish between the different |
| * invocations. |
| */ |
| struct timer_list { |
| struct list_head list; |
| unsigned long expires; |
| unsigned long data; |
| void (*function)(unsigned long); |
| }; |
| |
| extern void add_timer(struct timer_list * timer); |
| extern int del_timer(struct timer_list * timer); |
| |
| #ifdef CONFIG_SMP |
| extern int del_timer_sync(struct timer_list * timer); |
| extern void sync_timers(void); |
| #else |
| #define del_timer_sync(t) del_timer(t) |
| #define sync_timers() do { } while (0) |
| #endif |
| |
| /* |
| * 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). |
| * If the timer is known to be not pending (ie, in the handler), mod_timer |
| * is less efficient than 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; |
| } |
| |
| /* |
| * 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. |
| * |
| * time_after(a,b) returns true if the time a is after time b. |
| * |
| * 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 |