haiku/headers/private/kernel/timer.h

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/*
** Copyright 2003-2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
** Distributed under the terms of the OpenBeOS License.
*/
#ifndef _KERNEL_TIMER_H
#define _KERNEL_TIMER_H
#include <KernelExport.h>
#ifdef __cplusplus
extern "C" {
#endif
struct kernel_args;
#define B_TIMER_REAL_TIME_BASE 0x2000
// For an absolute timer the given time is interpreted as a real-time, not
// as a system time. Note that setting the real-time clock will cause the
// timer to be updated -- it will expire according to the new clock.
// Relative timers are unaffected by this flag.
#define B_TIMER_USE_TIMER_STRUCT_TIMES 0x4000
// For add_timer(): Use the timer::schedule_time (absolute time) and
// timer::period values instead of the period parameter.
#define B_TIMER_ACQUIRE_SCHEDULER_LOCK 0x8000
// The timer hook is invoked with the scheduler lock held. When invoking
// cancel_timer() with the scheduler lock held, too, this helps to avoid
// race conditions.
#define B_TIMER_FLAGS \
(B_TIMER_USE_TIMER_STRUCT_TIMES | B_TIMER_ACQUIRE_SCHEDULER_LOCK \
| B_TIMER_REAL_TIME_BASE)
/* Timer info structure */
struct timer_info {
const char *name;
int (*get_priority)(void);
status_t (*set_hardware_timer)(bigtime_t timeout);
status_t (*clear_hardware_timer)(void);
status_t (*init)(struct kernel_args *args);
};
typedef struct timer_info timer_info;
/* kernel functions */
status_t timer_init(struct kernel_args *);
void timer_init_post_rtc(void);
void timer_real_time_clock_changed();
int32 timer_interrupt(void);
#ifdef __cplusplus
}
#endif
#endif /* _KERNEL_TIMER_H */