FreeRTOS/Common/ethernet/uIP/uip-1.0/uip/timer.h

   1 /**
   2  * \defgroup timer Timer library
   3  *
   4  * The timer library provides functions for setting, resetting and
   5  * restarting timers, and for checking if a timer has expired. An
   6  * application must "manually" check if its timers have expired; this
   7  * is not done automatically.
   8  *
   9  * A timer is declared as a \c struct \c timer and all access to the
  10  * timer is made by a pointer to the declared timer.
  11  *
  12  * \note The timer library uses the \ref clock "Clock library" to
  13  * measure time. Intervals should be specified in the format used by
  14  * the clock library.
  15  *
  16  * @{
  17  */
  18
  19
  20 /**
  21  * \file
  22  * Timer library header file.
  23  * \author
  24  * Adam Dunkels <adam@sics.se>
  25  */
  26
  27 /*
  28  * Copyright (c) 2004, Swedish Institute of Computer Science.
  29  * All rights reserved.
  30  *
  31  * Redistribution and use in source and binary forms, with or without
  32  * modification, are permitted provided that the following conditions
  33  * are met:
  34  * 1. Redistributions of source code must retain the above copyright
  35  *    notice, this list of conditions and the following disclaimer.
  36  * 2. Redistributions in binary form must reproduce the above copyright
  37  *    notice, this list of conditions and the following disclaimer in the
  38  *    documentation and/or other materials provided with the distribution.
  39  * 3. Neither the name of the Institute nor the names of its contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  *
  55  * This file is part of the uIP TCP/IP stack
  56  *
  57  * Author: Adam Dunkels <adam@sics.se>
  58  *
  59  * $Id: timer.h,v 1.3 2006/06/11 21:46:39 adam Exp $
  60  */
  61 #ifndef __TIMER_H__
  62 #define __TIMER_H__
  63
  64 #include "clock.h"
  65
  66 /**
  67  * A timer.
  68  *
  69  * This structure is used for declaring a timer. The timer must be set
  70  * with timer_set() before it can be used.
  71  *
  72  * \hideinitializer
  73  */
  74 struct timer {
  75   clock_time_t start;
  76   clock_time_t interval;
  77 };
  78
  79 void timer_set(struct timer *t, clock_time_t interval);
  80 void timer_reset(struct timer *t);
  81 void timer_restart(struct timer *t);
  82 int timer_expired(struct timer *t);
  83
  84 #endif /* __TIMER_H__ */
  85
  86 /** @} */