102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/*
|
|
* 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>
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* Timer library header file.
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
*/
|
|
|
|
/** \addtogroup sys
|
|
* @{ */
|
|
|
|
/**
|
|
* \defgroup timer Timer library
|
|
*
|
|
* The Contiki kernel does not provide support for timed
|
|
* events. Rather, an application that wants to use timers needs to
|
|
* explicitly use the timer library.
|
|
*
|
|
* The timer library provides functions for setting, resetting and
|
|
* restarting timers, and for checking if a timer has expired. An
|
|
* application must "manually" check if its timers have expired; this
|
|
* is not done automatically.
|
|
*
|
|
* A timer is declared as a \c struct \c timer and all access to the
|
|
* timer is made by a pointer to the declared timer.
|
|
*
|
|
* \note The timer library is not able to post events when a timer
|
|
* expires. The \ref etimer "Event timers" should be used for this
|
|
* purpose.
|
|
*
|
|
* \note The timer library uses the \ref clock "Clock library" to
|
|
* measure time. Intervals should be specified in the format used by
|
|
* the clock library.
|
|
*
|
|
* \sa \ref etimer "Event timers"
|
|
*
|
|
* @{
|
|
*/
|
|
|
|
#ifndef TIMER_H_
|
|
#define TIMER_H_
|
|
|
|
#include "sys/clock.h"
|
|
|
|
/**
|
|
* A timer.
|
|
*
|
|
* This structure is used for declaring a timer. The timer must be set
|
|
* with timer_set() before it can be used.
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
struct timer {
|
|
clock_time_t start;
|
|
clock_time_t interval;
|
|
};
|
|
|
|
CCIF void timer_set(struct timer *t, clock_time_t interval);
|
|
void timer_reset(struct timer *t);
|
|
void timer_restart(struct timer *t);
|
|
CCIF int timer_expired(struct timer *t);
|
|
clock_time_t timer_remaining(struct timer *t);
|
|
|
|
|
|
#endif /* TIMER_H_ */
|
|
|
|
/** @} */
|
|
/** @} */
|