5 * \defgroup timer Timer library
\r
7 * The Contiki kernel does not provide support for timed
\r
8 * events. Rather, an application that wants to use timers needs to
\r
9 * explicitly use the timer library.
\r
11 * The timer library provides functions for setting, resetting and
\r
12 * restarting timers, and for checking if a timer has expired. An
\r
13 * application must "manually" check if its timers have expired; this
\r
14 * is not done automatically.
\r
16 * A timer is declared as a \c struct \c timer and all access to the
\r
17 * timer is made by a pointer to the declared timer.
\r
19 * \note The timer library is not able to post events when a timer
\r
20 * expires. The \ref etimer "Event timers" should be used for this
\r
23 * \note The timer library uses the \ref clock "Clock library" to
\r
24 * measure time. Intervals should be specified in the format used by
\r
25 * the clock library.
\r
27 * \sa \ref etimer "Event timers"
\r
34 * Timer library header file.
\r
36 * Adam Dunkels <adam@sics.se>
\r
40 * Copyright (c) 2004, Swedish Institute of Computer Science.
\r
41 * All rights reserved.
\r
43 * Redistribution and use in source and binary forms, with or without
\r
44 * modification, are permitted provided that the following conditions
\r
46 * 1. Redistributions of source code must retain the above copyright
\r
47 * notice, this list of conditions and the following disclaimer.
\r
48 * 2. Redistributions in binary form must reproduce the above copyright
\r
49 * notice, this list of conditions and the following disclaimer in the
\r
50 * documentation and/or other materials provided with the distribution.
\r
51 * 3. Neither the name of the Institute nor the names of its contributors
\r
52 * may be used to endorse or promote products derived from this software
\r
53 * without specific prior written permission.
\r
55 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
\r
56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
\r
57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
\r
58 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
\r
59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
\r
60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
\r
61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
\r
62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
\r
63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
\r
64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
\r
67 * This file is part of the Contiki operating system.
\r
69 * Author: Adam Dunkels <adam@sics.se>
\r
71 * $Id: timer.h,v 1.2 2008/09/21 08:58:05 adamdunkels Exp $
\r
76 #include "sys/clock.h"
\r
81 * This structure is used for declaring a timer. The timer must be set
\r
82 * with timer_set() before it can be used.
\r
89 clock_time_t interval;
\r
92 void timer_set( struct timer *t, clock_time_t interval );
\r
93 void timer_reset( struct timer *t );
\r
94 void timer_restart( struct timer *t );
\r
95 int timer_expired( struct timer *t );
\r
96 clock_time_t timer_remaining( struct timer *t );
\r
97 #endif /* __TIMER_H__ */
\r