1 /* 2 ** Copyright 2003-2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved. 3 ** Distributed under the terms of the OpenBeOS License. 4 */ 5 #ifndef _KERNEL_TIMER_H 6 #define _KERNEL_TIMER_H 7 8 9 #include <KernelExport.h> 10 11 12 #ifdef __cplusplus 13 extern "C" { 14 #endif 15 16 struct kernel_args; 17 18 #define B_TIMER_REAL_TIME_BASE 0x2000 19 // For an absolute timer the given time is interpreted as a real-time, not 20 // as a system time. Note that setting the real-time clock will cause the 21 // timer to be updated -- it will expire according to the new clock. 22 // Relative timers are unaffected by this flag. 23 #define B_TIMER_USE_TIMER_STRUCT_TIMES 0x4000 24 // For add_timer(): Use the timer::schedule_time (absolute time) and 25 // timer::period values instead of the period parameter. 26 #define B_TIMER_ACQUIRE_SCHEDULER_LOCK 0x8000 27 // The timer hook is invoked with the scheduler lock held. When invoking 28 // cancel_timer() with the scheduler lock held, too, this helps to avoid 29 // race conditions. 30 #define B_TIMER_FLAGS \ 31 (B_TIMER_USE_TIMER_STRUCT_TIMES | B_TIMER_ACQUIRE_SCHEDULER_LOCK \ 32 | B_TIMER_REAL_TIME_BASE) 33 34 /* Timer info structure */ 35 struct timer_info { 36 const char *name; 37 int (*get_priority)(void); 38 status_t (*set_hardware_timer)(bigtime_t timeout); 39 status_t (*clear_hardware_timer)(void); 40 status_t (*init)(struct kernel_args *args); 41 }; 42 43 typedef struct timer_info timer_info; 44 45 46 /* kernel functions */ 47 status_t timer_init(struct kernel_args *); 48 void timer_init_post_rtc(void); 49 void timer_real_time_clock_changed(); 50 int32 timer_interrupt(void); 51 52 #ifdef __cplusplus 53 } 54 #endif 55 56 #endif /* _KERNEL_TIMER_H */ 57