102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/** \addtogroup sys
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* @{ */
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/**
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* \defgroup timer Timer library
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*
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* The Contiki kernel does not provide support for timed
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* events. Rather, an application that wants to use timers needs to
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* explicitly use the timer library.
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*
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* The timer library provides functions for setting, resetting and
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* restarting timers, and for checking if a timer has expired. An
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* application must "manually" check if its timers have expired; this
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* is not done automatically.
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*
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* A timer is declared as a \c struct \c timer and all access to the
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* timer is made by a pointer to the declared timer.
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*
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* \note The timer library is not able to post events when a timer
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* expires. The \ref etimer "Event timers" should be used for this
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* purpose.
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*
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* \note The timer library uses the \ref clock "Clock library" to
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* measure time. Intervals should be specified in the format used by
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* the clock library.
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*
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* \sa \ref etimer "Event timers"
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*
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* @{
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*/
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/**
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* \file
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* Timer library header file.
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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/*
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* Copyright (c) 2004, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#ifndef TIMER_H_
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#define TIMER_H_
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#include "sys/clock.h"
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/**
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* A timer.
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*
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* This structure is used for declaring a timer. The timer must be set
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* with timer_set() before it can be used.
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*
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* \hideinitializer
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*/
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struct timer {
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clock_time_t start;
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clock_time_t interval;
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};
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CCIF void timer_set(struct timer *t, clock_time_t interval);
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void timer_reset(struct timer *t);
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void timer_restart(struct timer *t);
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CCIF int timer_expired(struct timer *t);
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clock_time_t timer_remaining(struct timer *t);
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#endif /* TIMER_H_ */
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/** @} */
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/** @} */
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