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88 lines
1.5 KiB
C
88 lines
1.5 KiB
C
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/*
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* \brief Timed event scheduler interface
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* \date 2005-10-24
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* \author Norman Feske <norman.feske@genode-labs.com>
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*/
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/*
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* Copyright (C) 2005-2011 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _TICK_H_
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#define _TICK_H_
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class Tick;
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class Tick
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{
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public:
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typedef unsigned long time;
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private:
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/**
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* Tick object attributes
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*/
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time _deadline; /* next deadline */
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time _period; /* duration between ticks */
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Tick *_next; /* next tick in tick list */
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int _active; /* set to one when active */
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/**
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* Enqueue tick into tick queue
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*/
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void _enqueue();
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/**
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* Dequeue tick from tick queue (for destruction of Tick)
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*/
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void _dequeue();
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protected:
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/**
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* Function to be called on when deadline is reached
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*
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* This function must be implemented by a derived class.
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* If the return value is 1, the tick is scheduled again.
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*/
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virtual int on_tick() = 0;
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public:
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Tick()
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{
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_deadline = 0;
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_period = 0;
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_active = 0;
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_next = 0;
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}
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virtual ~Tick() { _dequeue(); }
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/**
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* Schedule tick
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*
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* \param tick period
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*/
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void schedule(time period);
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/**
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* Return the number of scheduled ticks
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*/
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static int ticks_scheduled();
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/**
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* Handle ticks
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*
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* \param now current time
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*/
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static void handle(time now);
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};
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#endif /* _TICK_H_ */
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