scummvm/common/timer.h

/* Residual - Virtual machine to run LucasArts' 3D adventure games
 * Copyright (C) 2003-2008 The ScummVM-Residual Team (www.scummvm.org)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#ifndef COMMON_TIMER_H
#define COMMON_TIMER_H

#include "common/sys.h"
#include "common/noncopyable.h"

namespace Common {

class TimerManager : NonCopyable {
public:
	typedef void (*TimerProc)(void *refCon);

	virtual ~TimerManager() {}

	/**
	 * Install a new timer callback. It will from now be called every interval microseconds.
	 * The timer may be invoked from a separate thread. Hence any timer code should be
	 * written following the same safety guidelines as any other threaded code.
	 *
	 * @note Although the interval is specified in microseconds, the actual timer resolution
	 *       may be lower. In particular, with the SDL backend the timer resolution is 10ms.
	 * @param proc		the callback
	 * @param interval	the interval in which the timer shall be invoked (in microseconds)
	 * @param refCon	an arbitrary void pointer; will be passed to the timer callback
	 * @return	true if the timer was installed successfully, false otherwise
	 */
	virtual bool installTimerProc(TimerProc proc, int32 interval, void *refCon) = 0;

	/**
	 * Remove the given timer callback. It will not be invoked anymore.
	 */
	virtual void removeTimerProc(TimerProc proc) = 0;
};

} // End of namespace Common

#endif