/*
 *	CENA C++ Utilities
 *
 *	by Stephane Chatty
 *
 *	Copyright 1992
 *	Centre d'Etudes de la Navigation Aerienne (CENA)
 *
 *	timers
 *
 *	$Id$
 *	$CurLog$
 */

#ifndef Timer_H_
#define Timer_H_

#include "cplus_bugs.h"
#include "Time.h"

class CcuSignalHandler;
#if 0
template <class ITEM> class CcuListOf;
#else
#include "List.h"
#endif

class CcuBaseTimer {
public:
		enum timer_status	{ Active, Inactive };

private:
static	CcuSignalHandler*	TimeOutHandler;
static	CcuBaseTimer*	FirstActive;
#ifndef CPLUS_BUG19
static	CcuListOf <CcuBaseTimer>*	OtherActive;
#else
static	CcuList*	OtherActive;
#endif

static	void	ClassInit ();
static	void	HandleSignal (int);
static	void	SetAlarm (Millisecond);
static	void	StopAlarm ();
static	CcuBaseTimer*	ExtractNextActive ();
static	int	IsInactive (CcuBaseTimer*);

	Millisecond	NextDate;
	Millisecond	Period;
	int		PulsesLeft;
	timer_status Status;

	void	Activate ();
	void	Schedule (Millisecond);
	void	Reschedule ();

protected:
virtual	void	Handle (Millisecond);

public:	
		CcuBaseTimer (Millisecond, int = -1);
virtual		~CcuBaseTimer ();
	void	ChangePeriod (Millisecond first);
	void	Stop ();
	void	Restart ();
	void	Wait ();
inline	Millisecond	GetPeriod () const		{ return Period; }
inline	int		GetNbPulses () const		{ return PulsesLeft; }
inline	timer_status	GetStatus () const		{ return Status; }
};

class CcuTimer : public CcuBaseTimer {
protected:
	void	(*Handler) (Millisecond);
	void	Handle (Millisecond);

public:
		CcuTimer (Millisecond, void (*) (Millisecond), int = -1);
		~CcuTimer ();
};

#endif	/* Timer_H_ */