genode/os/include/dde_kit/timer.h
2012-01-03 15:35:05 +01:00

76 lines
1.7 KiB
C

/*
* \brief Timers and tick
* \author Christian Helmuth
* \date 2008-10-22
*
* DDE kit provides a generic timer implementation that enables users to
* execute a callback function after a certain period of time. Therefore, DDE
* kit starts a timer thread that executes callbacks and keeps track of the
* currently running timers.
*/
/*
* Copyright (C) 2008-2012 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__DDE_KIT__TIMER_H_
#define _INCLUDE__DDE_KIT__TIMER_H_
#include <dde_kit/thread.h>
/**********
** Tick **
**********/
/** Timer tick (global symbol) */
extern volatile unsigned long dde_kit_timer_ticks;
extern volatile unsigned long jiffies;
/** Timer tick rate */
enum { DDE_KIT_HZ = 100 };
/***********
** Timer **
***********/
struct dde_kit_timer;
/**
* Add timer event handler
*
* \param fn function to call on timeout
* \param priv private handler token
* \param timeout absolute timeout (in DDE kit ticks)
*
* \return timer reference on success; 0 otherwise
*
* After the absolute timeout has expired, function fn is called with args as
* arguments.
*/
struct dde_kit_timer *dde_kit_timer_add(void (*fn)(void *), void *priv,
unsigned long timeout);
/**
* Delete timer
*
* \param timer timer reference
*/
void dde_kit_timer_del(struct dde_kit_timer *timer);
/**
* Check whether a timer is pending
*
* \param timer timer reference
*/
int dde_kit_timer_pending(struct dde_kit_timer *timer);
/** Init timers and ticks */
void dde_kit_timer_init(void(*thread_init)(void *), void *priv);
#endif /* _INCLUDE__DDE_KIT__TIMER_H_ */