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15d2bace5e
In the recent timer rework we lost the check for an add_timer() of an already-pending timer. That check was useful for networking, so put it back. Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
#ifndef _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/list.h>
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#include <linux/spinlock.h>
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#include <linux/stddef.h>
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struct timer_base_s;
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struct timer_list {
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struct list_head entry;
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unsigned long expires;
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void (*function)(unsigned long);
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unsigned long data;
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struct timer_base_s *base;
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};
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extern struct timer_base_s __init_timer_base;
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#define TIMER_INITIALIZER(_function, _expires, _data) { \
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.function = (_function), \
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.expires = (_expires), \
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.data = (_data), \
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.base = &__init_timer_base, \
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}
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#define DEFINE_TIMER(_name, _function, _expires, _data) \
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struct timer_list _name = \
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TIMER_INITIALIZER(_function, _expires, _data)
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void fastcall init_timer(struct timer_list * timer);
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static inline void setup_timer(struct timer_list * timer,
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void (*function)(unsigned long),
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unsigned long data)
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{
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timer->function = function;
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timer->data = data;
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init_timer(timer);
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}
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/***
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* timer_pending - is a timer pending?
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* @timer: the timer in question
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*
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* timer_pending will tell whether a given timer is currently pending,
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* or not. Callers must ensure serialization wrt. other operations done
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* to this timer, eg. interrupt contexts, or other CPUs on SMP.
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*
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* return value: 1 if the timer is pending, 0 if not.
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*/
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static inline int timer_pending(const struct timer_list * timer)
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{
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return timer->entry.next != NULL;
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}
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extern void add_timer_on(struct timer_list *timer, int cpu);
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extern int del_timer(struct timer_list * timer);
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extern int __mod_timer(struct timer_list *timer, unsigned long expires);
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extern int mod_timer(struct timer_list *timer, unsigned long expires);
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extern unsigned long next_timer_interrupt(void);
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/***
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* add_timer - start a timer
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* @timer: the timer to be added
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*
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* The kernel will do a ->function(->data) callback from the
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* timer interrupt at the ->expired point in the future. The
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* current time is 'jiffies'.
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*
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* The timer's ->expired, ->function (and if the handler uses it, ->data)
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* fields must be set prior calling this function.
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*
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* Timers with an ->expired field in the past will be executed in the next
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* timer tick.
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*/
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static inline void add_timer(struct timer_list *timer)
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{
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BUG_ON(timer_pending(timer));
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__mod_timer(timer, timer->expires);
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}
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#ifdef CONFIG_SMP
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extern int try_to_del_timer_sync(struct timer_list *timer);
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extern int del_timer_sync(struct timer_list *timer);
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#else
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# define try_to_del_timer_sync(t) del_timer(t)
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# define del_timer_sync(t) del_timer(t)
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#endif
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#define del_singleshot_timer_sync(t) del_timer_sync(t)
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extern void init_timers(void);
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extern void run_local_timers(void);
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extern void it_real_fn(unsigned long);
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#endif
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