clock.h

/**
 * \defgroup clock Clock library
 * @{
 *
 * The clock library is the interface between Contiki and the platform
 * specific clock functionality. The clock library performs a single
 * function: measuring time. Additionally, the clock library provides
 * a macro, CLOCK_SECOND, which corresponds to one second of system
 * time.
 *
 * \note The clock library need in many cases not be used
 * directly. Rather, the \ref timer "timer library" should be used.
 *
 * \sa \ref timer "Timer library"
 */

/*
 * Copyright (c) 2004, Swedish Institute of Computer Science.
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 *
 * This file is part of the Contiki operating system.
 * 
 * Author: Adam Dunkels <adam@sics.se>
 *
 * $Id: clock.h,v 1.2 2005/05/18 18:43:36 adam Exp $
 */
#ifndef __CLOCK_H__
#define __CLOCK_H__

#include "clock-conf.h"

/**
 * Initialize the clock library.
 *
 * This function initializes the clock library and should be called
 * from the main() function of the system.
 *
 */
void clock_init(void);

/**
 * Get the current clock time.
 *
 * This function returns the current system clock time.
 *
 * \return The current clock time, measured in system ticks.
 */
clock_time_t clock_time(void);

/**
 * A second, measured in system clock time.
 *
 * \hideinitializer
 */
#ifdef CLOCK_CONF_SECOND
#define CLOCK_SECOND CLOCK_CONF_SECOND
#else
#define CLOCK_SECOND (clock_time_t)32
#endif

#endif /* __CLOCK_H__ */

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