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- #ifndef _LINUX_TIMER_H
- #define _LINUX_TIMER_H
-
- /*
- * Old-style timers. Please don't use for any new code.
- *
- * Numbering of these timers should be consecutive to minimize
- * processing delays. [MJ]
- */
-
- #define BLANK_TIMER 0 /* Console screen-saver */
- #define BEEP_TIMER 1 /* Console beep */
- #define RS_TIMER 2 /* RS-232 ports */
- #define SWAP_TIMER 3 /* Background pageout */
- #define BACKGR_TIMER 4 /* io_request background I/O */
- #define HD_TIMER 5 /* Old IDE driver */
- #define FLOPPY_TIMER 6 /* Floppy */
- #define QIC02_TAPE_TIMER 7 /* QIC 02 tape */
- #define MCD_TIMER 8 /* Mitsumi CDROM */
- #define GSCD_TIMER 9 /* Goldstar CDROM */
- #define COMTROL_TIMER 10 /* Comtrol serial */
- #define DIGI_TIMER 11 /* Digi serial */
- #define GDTH_TIMER 12 /* Ugh - gdth scsi driver */
-
- #define COPRO_TIMER 31 /* 387 timeout for buggy hardware (boot only) */
-
- struct timer_struct {
- unsigned long expires;
- void (*fn)(void);
- };
-
- extern unsigned long timer_active;
- extern struct timer_struct timer_table[32];
-
- /*
- * 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 timer_list *next; /* MUST be first element */
- struct timer_list *prev;
- 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);
-
- /*
- * 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)
- */
- void mod_timer(struct timer_list *timer, unsigned long expires);
-
- extern void it_real_fn(unsigned long);
-
- extern inline void init_timer(struct timer_list * timer)
- {
- timer->next = NULL;
- timer->prev = NULL;
- }
-
- extern inline int timer_pending(struct timer_list * timer)
- {
- return timer->prev != 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.
- *
- * 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
-