65918f386e
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@355 a95241bf-73f2-0310-859d-f6bbb57e9c96
97 lines
2.5 KiB
C
Executable File
97 lines
2.5 KiB
C
Executable File
#ifndef _KERNEL_TIMER_H
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#define _KERNEL_TIMER_H
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/**
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* @file kernel/timer.h
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* @brief Timer structures and definitions
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*/
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#include <stage2.h>
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/**
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* @defgroup Timer Timer structures (not architecture specific)
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* @ingroup OpenBeOS_Kernel
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* @{
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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typedef struct timer timer;
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typedef struct qent qent;
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typedef int32 (*timer_hook)(timer *);
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/**
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* qent structure
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*/
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/**
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* The BeOS qent structure is probably part of a general double linked list
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* interface used all over the kernel; a struct is required to have a qent
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* entry struct as first element, so it can be linked to other elements
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* easily. The key field is probably just an id, eventually used to order
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* the list.
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* Since we don't use this kind of interface, but we have to provide it
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* to keep compatibility, we can use the qent struct for other purposes...
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*/
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struct qent {
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int64 key; /* We use this as the sched time */
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qent *next; /* This is used as a pointer to next timer */
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qent *prev; /* This can be used for callback args */
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};
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/**
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* Timer event data structure
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*/
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struct timer {
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/** qent entry for this timer event */
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qent entry;
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/** This just holds the timer operating mode (relative/absolute/periodic) */
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uint16 flags;
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/** Number of the CPU associated to this timer event */
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uint16 cpu;
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/** Hook function to be called on timer expiration */
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timer_hook hook;
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/** Expiration time in microseconds */
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bigtime_t period;
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};
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/** @defgroup timermodes Timer operating modes
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* @ingroup Timer
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* @{
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*/
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/** @def B_ONE_SHOT_ABSOLUTE_TIMER the timer will fire once at the system
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* time specified by period
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*/
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/** @def B_ONE_SHOT_RELATIVE_TIMER the timer will fire once in approximately
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* period microseconds
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*/
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/** @def B_PERIODIC_TIMER the timer will fire every period microseconds,
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* starting in period microseconds
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*/
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#define B_ONE_SHOT_ABSOLUTE_TIMER 1
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#define B_ONE_SHOT_RELATIVE_TIMER 2
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#define B_PERIODIC_TIMER 3
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/** @} */
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status_t add_timer(timer *event, timer_hook hook, bigtime_t period, int32 flags);
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bool cancel_timer(timer *event);
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void spin(bigtime_t microseconds);
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/** kernel functions */
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int timer_init(kernel_args *);
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int timer_interrupt(void);
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/** these two are only to be used by the scheduler */
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int local_timer_cancel_event(timer *event);
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int _local_timer_cancel_event(int curr_cpu, timer *event);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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/** @} */
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#endif /* _KERNEL_TIMER_H */
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