diff options
Diffstat (limited to 'xenolinux-2.4.25-sparse/include/linux/timer.h')
-rw-r--r-- | xenolinux-2.4.25-sparse/include/linux/timer.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/xenolinux-2.4.25-sparse/include/linux/timer.h b/xenolinux-2.4.25-sparse/include/linux/timer.h new file mode 100644 index 0000000000..238083218f --- /dev/null +++ b/xenolinux-2.4.25-sparse/include/linux/timer.h @@ -0,0 +1,77 @@ +#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_NO_IDLE_HZ +extern struct timer_list *next_timer_event(void); +#endif + +#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 |