contiki/core/sys/rtimer.c

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/**
* \addtogroup rt
* @{
*/
/**
* \file
* Implementation of the architecture-agnostic parts of the real-time timer module.
* \author
* Adam Dunkels <adam@sics.se>
*
*/
/*
* Copyright (c) 2005, 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.
*
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* @(#)$Id: rtimer.c,v 1.7 2010/01/19 13:08:24 adamdunkels Exp $
*/
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#include "sys/rtimer.h"
#include "contiki.h"
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
static struct rtimer *next_rtimer;
/*---------------------------------------------------------------------------*/
void
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rtimer_init(void)
{
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rtimer_arch_init();
}
/*---------------------------------------------------------------------------*/
int
rtimer_set(struct rtimer *rtimer, rtimer_clock_t time,
rtimer_clock_t duration,
rtimer_callback_t func, void *ptr)
{
int first = 0;
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PRINTF("rtimer_set time %d\n", time);
if(next_rtimer == NULL) {
first = 1;
}
rtimer->func = func;
rtimer->ptr = ptr;
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rtimer->time = time;
next_rtimer = rtimer;
if(first == 1) {
rtimer_arch_schedule(time);
}
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return RTIMER_OK;
}
/*---------------------------------------------------------------------------*/
void
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rtimer_run_next(void)
{
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struct rtimer *t;
if(next_rtimer == NULL) {
return;
}
t = next_rtimer;
next_rtimer = NULL;
t->func(t, t->ptr);
if(next_rtimer != NULL) {
rtimer_arch_schedule(next_rtimer->time);
}
return;
}
/*---------------------------------------------------------------------------*/