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#ifndef APOS_TIMER_H
#define APOS_TIMER_H
/**
* @file timer.h
* Timer handling.
*/
#include <apos/types.h>
/* GCC will compile uint64_t even on 32bit platforms, just with some runtime
* overhead, should be fine. This will allow us to have a reasonable time range
* even with nanosecond clocks. (138 years with ~4.2 Hz clock) */
typedef uint64_t ticks_t;
/* whichever time unit we're dealing with */
typedef size_t tunit_t;
struct timer {
id_t tid;
id_t cid;
ticks_t ticks;
};
/**
* Initialize timers.
*
* @param fdt Pointer to global FDT
*/
void init_timer(const void *fdt);
/**
* Set up timer interrupt ticks from now.
*
* @param tid Thread id for callback.
* @param ticks Ticks from \ref current_ticks().
* @return Id of created timer.
*/
id_t new_rel_timer(id_t tid, ticks_t ticks);
/**
* Set up timer interrupt at ticks.
*
* @param tid Thread id for callback.
* @param ticks Ticks from \ref current_ticks().
* @return Id of created timer.
*/
id_t new_abs_timer(id_t tid, ticks_t ticks);
struct timer *newest_timer();
struct timer *find_timer(id_t cid);
void remove_timer(struct timer *);
ticks_t nsecs_to_ticks(tunit_t nsecs);
static inline ticks_t usecs_to_ticks(tunit_t usecs)
{
return nsecs_to_ticks(usecs * 1000);
}
static inline ticks_t msecs_to_ticks(tunit_t msecs)
{
return usecs_to_ticks(msecs * 1000);
}
/* TODO: likely not a problem on 64bit systems, not sure how to handle situation on
* 32bit */
static inline ticks_t secs_to_ticks(tunit_t secs)
{
return msecs_to_ticks(secs * 1000);
}
#endif /* APOS_TIMER_H */
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