#ifndef _LINUX_TIMER_H
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#ifndef _LINUX_TIMER_H
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#define _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/config.h>
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#include <linux/list.h>
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#include <linux/list.h>
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/*
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/*
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* In Linux 2.4, static timers have been removed from the kernel.
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* In Linux 2.4, static timers have been removed from the kernel.
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* Timers may be dynamically created and destroyed, and should be initialized
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* Timers may be dynamically created and destroyed, and should be initialized
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* by a call to init_timer() upon creation.
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* by a call to init_timer() upon creation.
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*
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*
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* The "data" field enables use of a common timeout function for several
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* The "data" field enables use of a common timeout function for several
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* timeouts. You can use this field to distinguish between the different
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* timeouts. You can use this field to distinguish between the different
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* invocations.
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* invocations.
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*/
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*/
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struct timer_list {
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struct timer_list {
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struct list_head list;
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struct list_head list;
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unsigned long expires;
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unsigned long expires;
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unsigned long data;
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unsigned long data;
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void (*function)(unsigned long);
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void (*function)(unsigned long);
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};
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};
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extern void add_timer(struct timer_list * timer);
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extern void add_timer(struct timer_list * timer);
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extern int del_timer(struct timer_list * timer);
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extern int del_timer(struct timer_list * timer);
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#ifdef CONFIG_SMP
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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_timer_sync(struct timer_list * timer);
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extern void sync_timers(void);
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extern void sync_timers(void);
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#else
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#else
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#define del_timer_sync(t) del_timer(t)
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#define del_timer_sync(t) del_timer(t)
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#define sync_timers() do { } while (0)
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#define sync_timers() do { } while (0)
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#endif
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#endif
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/*
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/*
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* mod_timer is a more efficient way to update the expire field of an
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* mod_timer is a more efficient way to update the expire field of an
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* active timer (if the timer is inactive it will be activated)
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* active timer (if the timer is inactive it will be activated)
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* mod_timer(a,b) is equivalent to del_timer(a); a->expires = b; add_timer(a).
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* mod_timer(a,b) is equivalent to del_timer(a); a->expires = b; add_timer(a).
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* If the timer is known to be not pending (ie, in the handler), mod_timer
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* If the timer is known to be not pending (ie, in the handler), mod_timer
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* is less efficient than a->expires = b; add_timer(a).
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* is less efficient than a->expires = b; add_timer(a).
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*/
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*/
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int mod_timer(struct timer_list *timer, unsigned long expires);
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int mod_timer(struct timer_list *timer, unsigned long expires);
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extern void it_real_fn(unsigned long);
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extern void it_real_fn(unsigned long);
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static inline void init_timer(struct timer_list * timer)
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static inline void init_timer(struct timer_list * timer)
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{
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{
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timer->list.next = timer->list.prev = NULL;
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timer->list.next = timer->list.prev = NULL;
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}
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}
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static inline int timer_pending (const struct timer_list * timer)
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static inline int timer_pending (const struct timer_list * timer)
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{
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{
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return timer->list.next != NULL;
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return timer->list.next != NULL;
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}
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}
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/*
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/*
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* These inlines deal with timer wrapping correctly. You are
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* These inlines deal with timer wrapping correctly. You are
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* strongly encouraged to use them
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* strongly encouraged to use them
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* 1. Because people otherwise forget
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* 1. Because people otherwise forget
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* 2. Because if the timer wrap changes in future you wont have to
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* 2. Because if the timer wrap changes in future you wont have to
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* alter your driver code.
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* alter your driver code.
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*
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*
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* time_after(a,b) returns true if the time a is after time b.
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* time_after(a,b) returns true if the time a is after time b.
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*
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*
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* Do this with "<0" and ">=0" to only test the sign of the result. A
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* Do this with "<0" and ">=0" to only test the sign of the result. A
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* good compiler would generate better code (and a really good compiler
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* good compiler would generate better code (and a really good compiler
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* wouldn't care). Gcc is currently neither.
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* wouldn't care). Gcc is currently neither.
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*/
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*/
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#define time_after(a,b) ((long)(b) - (long)(a) < 0)
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#define time_after(a,b) ((long)(b) - (long)(a) < 0)
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#define time_before(a,b) time_after(b,a)
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#define time_before(a,b) time_after(b,a)
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#define time_after_eq(a,b) ((long)(a) - (long)(b) >= 0)
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#define time_after_eq(a,b) ((long)(a) - (long)(b) >= 0)
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#define time_before_eq(a,b) time_after_eq(b,a)
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#define time_before_eq(a,b) time_after_eq(b,a)
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#endif
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#endif
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